diff --git a/README.md b/README.md
index ca8b35724c..03570eb797 100644
--- a/README.md
+++ b/README.md
@@ -197,7 +197,7 @@ eventually be removed.
 ```yaml
 ---
 :todo:
-- libsass # sass/libsass#2827
+- sass/libsass#2827
 ```
 
 This option indicates implementations that should add support for a spec, but
@@ -206,9 +206,11 @@ marked as `:todo` for that implementation are skipped by default. This ensures t
 the build remains green while clearly marking which specs are expected to pass
 eventually.
 
-In general, when marking a spec as `:todo` for an implementation, it's a good
-idea to include a comment referencing the GitHub issue for that implementation
-that will fix the spec. If no issue exists yet, please file one.
+Implementations can be (and should be) specified as shorthand GitHub issue
+references rather than plain names. This makes it easy to track whether the
+implementation has fixed the issue, and to see which specs correspond to which
+issue. When marking an issue as `:todo` for an implementation, please either
+find an existing issue to reference or file a new one.
 
 If the `--run-todo` flag is passed to `sass-spec.rb`, specs marked as `:todo`
 for the current implementation will be run, and their failures will be reported.
@@ -225,7 +227,7 @@ these specs.
 ```yaml
 ---
 :warning_todo:
-- libsass # sass/libsass#2834
+- sass/libsass#2834
 ```
 
 This option works like [`:todo`](#todo), except instead of skipping the entire
diff --git a/STYLE_GUIDE.md b/STYLE_GUIDE.md
index d780209c63..bdb2216211 100644
--- a/STYLE_GUIDE.md
+++ b/STYLE_GUIDE.md
@@ -754,7 +754,7 @@ be named "other" (`_other.scss`, `_other.sass`, etc).
 <===> slash_slash_string/options.yml
 ---
 :todo:
-- libsass # sass/libsass#2840
+- sass/libsass#2840
 
 <===> slash_slash_string/input.scss
 a {b: 1 / 2 / foo()}
@@ -784,10 +784,10 @@ a {
 
 </details>
 
-When [marking a spec as `:todo`][], follow it with a comment that refers to an
-issue in the implementation in question tracking the feature the spec tests. If
-there isn't an issue yet, create one. Make sure to also link that issue back to
-the specs for it!
+When [marking a spec as `:todo`][], use a reference to an issue in the
+implementation in question tracking the feature the spec tests. If there isn't
+an issue yet, create one. Make sure to also link that issue back to the specs
+for it!
 
 [marking a spec as `:todo`]: README.md#todo
 
@@ -996,7 +996,7 @@ directory. It just serves to visually separate specs from one another.
 <===> top_level/options.yml
 ---
 :warning_todo:
-- libsass # sass/libsass#2834
+- sass/libsass#2834
 :ignore_for:
 - ruby-sass
 
@@ -1041,7 +1041,7 @@ declare new variables. Consider adding `$var: null` at the top level.
 <===> top_level/options.yml
 ---
 :warning_todo:
-- libsass # sass/libsass#2834
+- sass/libsass#2834
 :ignore_for:
 - ruby-sass
 
diff --git a/lib/sass_spec/directory.rb b/lib/sass_spec/directory.rb
index da9f0d3cb3..878f7a5387 100644
--- a/lib/sass_spec/directory.rb
+++ b/lib/sass_spec/directory.rb
@@ -176,6 +176,15 @@ def with_real_files
     FileUtils.rm_rf(outermost_new_dir) if outermost_new_dir
   end
 
+  # Returns an HRX representation of this directory.
+  def to_hrx
+    archive = HRX::Archive.new
+    glob("**/*").each do |path|
+      archive << HRX::File.new("#{self.path}/#{path}", read(path))
+    end
+    archive.to_hrx
+  end
+
   def inspect
     "#<SassSpec::Directory:#{@path}>"
   end
diff --git a/lib/sass_spec/test.rb b/lib/sass_spec/test.rb
index 5b792e70c8..31411637e5 100644
--- a/lib/sass_spec/test.rb
+++ b/lib/sass_spec/test.rb
@@ -128,28 +128,9 @@ def handle_conflicting_files!
     choice = interact(:conflicting_files, :fail) do |i|
       i.prompt "Test has both error and success outputs."
 
-      show_input_choice(i)
+      show_test_case_choice(i)
       show_output_choice(i)
 
-      if output_file_exists
-        i.choice('eo', 'Show expected output.') do
-          display_text_block(@test_case.read("output.css", impl: impl))
-          i.restart!
-        end
-      end
-
-      if warning_file_exists
-        i.choice('ew', 'Show expected warning.') do
-          display_text_block(@test_case.read("warning", impl: impl))
-          i.restart!
-        end
-      end
-
-      i.choice('ee', 'Show expected error.') do
-        display_text_block(@test_case.read("error", impl: :auto))
-        i.restart!
-      end
-
       delete_choice(i)
 
       i.choice('S', 'Keep the success output.') do
@@ -179,7 +160,7 @@ def handle_missing_output!
     choice = interact(:missing_output, :fail) do |i|
       i.prompt "Expected output file does not exist."
 
-      show_input_choice(i)
+      show_test_case_choice(i)
       show_output_choice(i)
       delete_choice(i)
       update_output_choice(i)
@@ -202,7 +183,7 @@ def handle_unexpected_error!
     choice = interact(:unexpected_error, :fail) do |i|
       i.prompt "An unexpected compiler error was encountered."
 
-      show_input_choice(i)
+      show_test_case_choice(i)
 
       i.choice('e', "Show me the error.") do
         display_text_block(@error)
@@ -234,12 +215,7 @@ def handle_unexpected_pass!
     choice = interact(:unexpected_pass, :fail) do |i|
       i.prompt "A failure was expected but it compiled instead."
 
-      show_input_choice(i)
-
-      i.choice('e', "Show me the expected error.") do
-        display_text_block(@test_case.expected_error)
-        i.restart!
-      end
+      show_test_case_choice(i)
 
       i.choice('o', "Show me the output.") do
         display_text_block(@output)
@@ -270,7 +246,7 @@ def handle_output_difference!
     interact(:output_difference, :fail) do |i|
       i.prompt "Output does not match expectation."
 
-      show_input_choice(i)
+      show_test_case_choice(i)
 
       i.choice('d', "show diff.") do
         require 'diffy'
@@ -297,14 +273,7 @@ def handle_unnecessary_todo!
     interact(:unnecessary_todo, :fail) do |i|
       i.prompt "Test is passing but marked as TODO."
 
-      show_input_choice(i)
-
-      if @test_case.should_fail?
-        i.choice('e', "Show me the expected error.") do
-          display_text_block(@test_case.expected_error)
-          i.restart!
-        end
-      end
+      show_test_case_choice(i)
 
       unless @output.empty?
         i.choice('o', "Show me the output.") do
@@ -367,26 +336,21 @@ def handle_stderr_difference!
     interact(type, :fail) do |i|
       i.prompt(message)
 
-      show_input_choice(i)
+      show_test_case_choice(i)
 
-      if error_msg.empty?
-        i.choice('e', "Show expected #{@test_case.should_fail? ? 'error' : 'warning'}.") do
-          display_text_block(@test.expected_error)
-          i.restart!
-        end
-      elsif expected_error_msg.empty?
+      unless error_msg.empty?
         i.choice('e', "Show #{@test_case.should_fail? ? 'error' : 'warning'}.") do
           display_text_block(error_msg)
           i.restart!
         end
-      else
-        i.choice('d', "Show diff.") do
-          require 'diffy'
-          display_text_block(
-            Diffy::Diff.new("Expected\n#{expected_error_msg}",
-                            "Actual\n#{error_msg}").to_s(:color))
-          i.restart!
-        end
+      end
+
+      i.choice('d', "Show diff.") do
+        require 'diffy'
+        display_text_block(
+          Diffy::Diff.new("Expected\n#{expected_error_msg}",
+                          "Actual\n#{error_msg}").to_s(:color))
+        i.restart!
       end
 
       update_output_choice(i)
@@ -413,9 +377,9 @@ def interact(prompt_id, default, &block)
     end
   end
 
-  def show_input_choice(i)
-    i.choice('i', "Show me the input.") do
-      display_text_block(@test_case.input)
+  def show_test_case_choice(i)
+    i.choice('t', "Show me the test case.") do
+      display_text_block(@test_case.dir.to_hrx)
       i.restart!
     end
   end
diff --git a/lib/sass_spec/test_case_metadata.rb b/lib/sass_spec/test_case_metadata.rb
index ce3afad51f..3c07a74d43 100644
--- a/lib/sass_spec/test_case_metadata.rb
+++ b/lib/sass_spec/test_case_metadata.rb
@@ -48,7 +48,14 @@ def self.merge_options(existing_opts, new_opts)
     # Parses metadata for the test case at the given SassSpec::Directory.
     def initialize(test_case_dir)
       @name = test_case_dir.to_s
-      @options = resolve_options(test_case_dir).freeze
+      @options = resolve_options(test_case_dir)
+    end
+
+    def resolve_options(dir)
+      self.class.cache[dir.path] ||= _resolve_options(dir).tap do |options|
+        _normalize_todos(options, :todo)
+        _normalize_todos(options, :warning_todo)
+      end.freeze
     end
 
     def _resolve_options(dir)
@@ -72,8 +79,14 @@ def _resolve_options(dir)
       rv
     end
 
-    def resolve_options(dir)
-      self.class.cache[dir.path] ||= _resolve_options(dir).freeze
+    # Normalize a list of TODOs to convert GitHub issue references to
+    # implementation names.
+    def _normalize_todos(options, field)
+      if options.include?(field)
+        options[field] = options[field]
+          .map {|name| name =~ %r{^sass/(.*)#} ? $1 : name}
+          .to_set
+      end
     end
 
     def todo?(impl)
diff --git a/spec/colors/adjust-hue.hrx b/spec/colors/adjust-hue.hrx
deleted file mode 100644
index 8c94ea9fca..0000000000
--- a/spec/colors/adjust-hue.hrx
+++ /dev/null
@@ -1,20 +0,0 @@
-<===> input.scss
-p {
-  color: adjust-hue(#f00, 10);
-  color: adjust-hue(#900, 90);
-  color: adjust-hue(#000, 30);
-  color: adjust-hue(#fff, -30);
-  color: adjust-hue(#999, -530);
-  color: adjust-hue(#000, +720);
-  // error in libsass
-  // color: adjust-hue(#333, + 720);
-}
-<===> output.css
-p {
-  color: #ff2b00;
-  color: #4d9900;
-  color: black;
-  color: white;
-  color: #999999;
-  color: black;
-}
diff --git a/spec/colors/complement.hrx b/spec/colors/complement.hrx
deleted file mode 100644
index 6d90f17fee..0000000000
--- a/spec/colors/complement.hrx
+++ /dev/null
@@ -1,31 +0,0 @@
-<===> input.scss
-p {
-  color: complement(#f00);
-  color: complement(#900);
-  color: complement(#000);
-  color: complement(#fff);
-  color: complement(#999);
-  color: complement(#000);
-  color: complement(#333);
-}
-<===> output.css
-p {
-  color: cyan;
-  color: #009999;
-  color: black;
-  color: white;
-  color: #999999;
-  color: black;
-  color: #333333;
-}
-
-<===> output-dart-sass.css
-p {
-  color: aqua;
-  color: #009999;
-  color: black;
-  color: white;
-  color: #999999;
-  color: black;
-  color: #333333;
-}
diff --git a/spec/colors/desaturate.hrx b/spec/colors/desaturate.hrx
deleted file mode 100644
index bdc0e64e12..0000000000
--- a/spec/colors/desaturate.hrx
+++ /dev/null
@@ -1,16 +0,0 @@
-<===> input.scss
-p {
-  color: desaturate(#fff, 10%);
-  color: desaturate(#999, 10%);
-  color: desaturate(#000, 10%);
-  color: desaturate(#f00, 10%);
-  color: desaturate(#900, 10%);
-}
-<===> output.css
-p {
-  color: white;
-  color: #999999;
-  color: black;
-  color: #f20d0d;
-  color: #910808;
-}
diff --git a/spec/colors/fade-in.hrx b/spec/colors/fade-in.hrx
deleted file mode 100644
index 6115460a8f..0000000000
--- a/spec/colors/fade-in.hrx
+++ /dev/null
@@ -1,35 +0,0 @@
-<===> input.scss
-p {
-  color: fade-in(#f00, 0.3);
-  color: fade-in(#900, 0.8);
-  color: fade-in(#000, .6);
-  color: fade-in(#fff, .2);
-  color: fade-in(#999, .4);
-  color: fade-in(#000, .5);
-  color: fade-in(#333, +.99);
-  // test old function name
-  color: opacify(#f00, 0.3);
-  color: opacify(#900, 0.8);
-  color: opacify(#000, .6);
-  color: opacify(#fff, .2);
-  color: opacify(#999, .4);
-  color: opacify(#000, .5);
-  color: opacify(#333, +.99);
-}
-<===> output.css
-p {
-  color: red;
-  color: #990000;
-  color: black;
-  color: white;
-  color: #999999;
-  color: black;
-  color: #333333;
-  color: red;
-  color: #990000;
-  color: black;
-  color: white;
-  color: #999999;
-  color: black;
-  color: #333333;
-}
diff --git a/spec/colors/fade-out.hrx b/spec/colors/fade-out.hrx
deleted file mode 100644
index 291ac5208e..0000000000
--- a/spec/colors/fade-out.hrx
+++ /dev/null
@@ -1,35 +0,0 @@
-<===> input.scss
-p {
-  color: fade-out(#f00, 0.3);
-  color: fade-out(#900, 0.8);
-  color: fade-out(#000, .6);
-  color: fade-out(#fff, .2);
-  color: fade-out(#999, .4);
-  color: fade-out(#000, .5);
-  color: fade-out(#333, +.99);
-  // test old function name
-  color: transparentize(#f00, 0.3);
-  color: transparentize(#900, 0.8);
-  color: transparentize(#000, .6);
-  color: transparentize(#fff, .2);
-  color: transparentize(#999, .4);
-  color: transparentize(#000, .5);
-  color: transparentize(#333, +.99);
-}
-<===> output.css
-p {
-  color: rgba(255, 0, 0, 0.7);
-  color: rgba(153, 0, 0, 0.2);
-  color: rgba(0, 0, 0, 0.4);
-  color: rgba(255, 255, 255, 0.8);
-  color: rgba(153, 153, 153, 0.6);
-  color: rgba(0, 0, 0, 0.5);
-  color: rgba(51, 51, 51, 0.01);
-  color: rgba(255, 0, 0, 0.7);
-  color: rgba(153, 0, 0, 0.2);
-  color: rgba(0, 0, 0, 0.4);
-  color: rgba(255, 255, 255, 0.8);
-  color: rgba(153, 153, 153, 0.6);
-  color: rgba(0, 0, 0, 0.5);
-  color: rgba(51, 51, 51, 0.01);
-}
diff --git a/spec/colors/saturate.hrx b/spec/colors/saturate.hrx
deleted file mode 100644
index e5cd4049cc..0000000000
--- a/spec/colors/saturate.hrx
+++ /dev/null
@@ -1,18 +0,0 @@
-<===> input.scss
-p {
-  color: saturate(#f00, 10%);
-  color: saturate(#900, 10%);
-  color: saturate(#000, 10%);
-  color: saturate(#fff, 10%);
-  color: saturate(#999, 10%);
-  color: saturate(#000, 10%);
-}
-<===> output.css
-p {
-  color: red;
-  color: #990000;
-  color: black;
-  color: white;
-  color: #a38f8f;
-  color: black;
-}
diff --git a/spec/colors/saturation.hrx b/spec/colors/saturation.hrx
deleted file mode 100644
index cd86f7ec26..0000000000
--- a/spec/colors/saturation.hrx
+++ /dev/null
@@ -1,31 +0,0 @@
-<===> input.scss
-p {
-  test-01: saturation(red);
-  test-01: saturation(#333);
-  test-02: saturation(hsl(60, 30, 20));
-  test-03: saturation(saturate(#f00, 10%));
-  test-04: saturation(saturate(#900, 10%));
-  // this is probably a ruby sass bug
-  // test-05: saturation(saturate(#000, 10%));
-  // test-06: saturation(saturate(#fff, 10%));
-  test-07: saturation(saturate(#999, 10%));
-  test-08: saturation(desaturate(#fff, 10%));
-  test-09: saturation(desaturate(#999, 10%));
-  test-10: saturation(desaturate(#000, 10%));
-  test-11: saturation(desaturate(#f00, 10%));
-  test-12: saturation(desaturate(#900, 10%));
-}
-<===> output.css
-p {
-  test-01: 100%;
-  test-01: 0%;
-  test-02: 30%;
-  test-03: 100%;
-  test-04: 100%;
-  test-07: 10%;
-  test-08: 0%;
-  test-09: 0%;
-  test-10: 0%;
-  test-11: 90%;
-  test-12: 90%;
-}
diff --git a/spec/core_functions/color/adjust_hue.hrx b/spec/core_functions/color/adjust_hue.hrx
new file mode 100644
index 0000000000..6517ee263f
--- /dev/null
+++ b/spec/core_functions/color/adjust_hue.hrx
@@ -0,0 +1,169 @@
+<===> max/input.scss
+a {b: adjust-hue(red, 359)}
+
+<===> max/output.css
+a {
+  b: #ff0004;
+}
+
+<===>
+================================================================================
+<===> above_max/input.scss
+a {b: adjust-hue(red, 540)}
+
+<===> above_max/output.css
+a {
+  b: aqua;
+}
+
+<===> above_max/output-libsass.css
+a {
+  b: cyan;
+}
+
+<===>
+================================================================================
+<===> min/input.scss
+a {b: adjust-hue(blue, 0)}
+
+<===> min/output.css
+a {
+  b: blue;
+}
+
+<===>
+================================================================================
+<===> negative/input.scss
+a {b: adjust-hue(red, -180)}
+
+<===> negative/output.css
+a {
+  b: aqua;
+}
+
+<===> negative/output-libsass.css
+a {
+  b: cyan;
+}
+
+<===>
+================================================================================
+<===> middle/input.scss
+a {b: adjust-hue(red, 123)}
+
+<===> middle/output.css
+a {
+  b: #00ff0d;
+}
+
+<===>
+================================================================================
+<===> fraction/input.scss
+a {b: adjust-hue(red, 0.5)}
+
+<===> fraction/output.css
+a {
+  b: #ff0200;
+}
+
+<===>
+================================================================================
+<===> alpha/input.scss
+a {b: adjust-hue(rgba(red, 0.1), 359)}
+
+<===> alpha/output.css
+a {
+  b: rgba(255, 0, 4, 0.1);
+}
+
+<===>
+================================================================================
+<===> named/input.scss
+a {b: adjust-hue($color: red, $degrees: 123)}
+
+<===> named/output.css
+a {
+  b: #00ff0d;
+}
+
+<===>
+================================================================================
+<===> error/too_few_args/input.scss
+a {b: adjust-hue(red)}
+
+<===> error/too_few_args/error
+Error: Missing argument $degrees.
+  ,
+1 | a {b: adjust-hue(red)}
+  |       ^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_few_args/error-libsass
+Error: Function adjust-hue is missing argument $degrees.
+        on line 1 of input.scss
+>> a {b: adjust-hue(red)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/too_many_args/input.scss
+a {b: adjust-hue(red, 1, 2)}
+
+<===> error/too_many_args/error
+Error: Only 2 arguments allowed, but 3 were passed.
+  ,
+1 | a {b: adjust-hue(red, 1, 2)}
+  |       ^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_many_args/error-libsass
+Error: wrong number of arguments (3 for 2) for `adjust-hue'
+        on line 1:7 of input.scss
+>> a {b: adjust-hue(red, 1, 2)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/type/color/input.scss
+a {b: adjust-hue(1, 2)}
+
+<===> error/type/color/error
+Error: $color: 1 is not a color.
+  ,
+1 | a {b: adjust-hue(1, 2)}
+  |       ^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/type/color/error-libsass
+Error: argument `$color` of `adjust-hue($color, $degrees)` must be a color
+        on line 1:7 of input.scss, in function `adjust-hue`
+        from line 1:7 of input.scss
+>> a {b: adjust-hue(1, 2)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/type/hue/input.scss
+a {b: adjust-hue(red, blue)}
+
+<===> error/type/hue/error
+Error: $degrees: blue is not a number.
+  ,
+1 | a {b: adjust-hue(red, blue)}
+  |       ^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/type/hue/error-libsass
+Error: argument `$degrees` of `adjust-hue($color, $degrees)` must be a number
+        on line 1:7 of input.scss, in function `adjust-hue`
+        from line 1:7 of input.scss
+>> a {b: adjust-hue(red, blue)}
+
+   ------^
diff --git a/spec/core_functions/color/alpha.hrx b/spec/core_functions/color/alpha.hrx
new file mode 100644
index 0000000000..2d9e5cfa3e
--- /dev/null
+++ b/spec/core_functions/color/alpha.hrx
@@ -0,0 +1,224 @@
+<===> color/max/input.scss
+a {b: alpha(red)}
+
+<===> color/max/output.css
+a {
+  b: 1;
+}
+
+<===>
+================================================================================
+<===> color/min/input.scss
+a {b: alpha(rgba(red, 0))}
+
+<===> color/min/output.css
+a {
+  b: 0;
+}
+
+<===>
+================================================================================
+<===> color/middle/input.scss
+a {b: alpha(rgba(red, 0.42))}
+
+<===> color/middle/output.css
+a {
+  b: 0.42;
+}
+
+<===>
+================================================================================
+<===> color/named/input.scss
+a {b: alpha($color: rgba(red, 0.73))}
+
+<===> color/named/output.css
+a {
+  b: 0.73;
+}
+
+<===>
+================================================================================
+<===> filter/one_arg/input.scss
+a {b: alpha(c=d)}
+
+<===> filter/one_arg/output.css
+a {
+  b: alpha(c=d);
+}
+
+<===>
+================================================================================
+<===> filter/multi_args/options.yml
+---
+:todo:
+- sass/dart-sass#701
+
+<===> filter/multi_args/input.scss
+a {b: alpha(c=d, e=f, g=h)}
+
+<===> filter/multi_args/output.css
+a {
+  b: alpha(c=d, e=f, g=h);
+}
+
+<===>
+================================================================================
+<===> filter/space_before_equals/input.scss
+a {b: alpha(unquote("c = d"))}
+
+<===> filter/space_before_equals/output.css
+a {
+  b: alpha(c = d);
+}
+
+<===>
+================================================================================
+<===> opacity/positional/input.scss
+a {b: opacity(rgba(red, 0.2))}
+
+<===> opacity/positional/output.css
+a {
+  b: 0.2;
+}
+
+<===>
+================================================================================
+<===> opacity/named/input.scss
+a {b: opacity($color: rgba(red, 0.2))}
+
+<===> opacity/named/output.css
+a {
+  b: 0.2;
+}
+
+<===>
+================================================================================
+<===> opacity/filter/input.scss
+a {b: opacity(10%)}
+
+<===> opacity/filter/output.css
+a {
+  b: opacity(10%);
+}
+
+<===>
+================================================================================
+<===> error/too_few_args/options.yml
+---
+:todo:
+- sass/dart-sass#700
+
+<===> error/too_few_args/input.scss
+a {b: alpha()}
+
+<===> error/too_few_args/error
+Error: Missing argument $color.
+  ,
+1 | a {b: alpha()}
+  |       ^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_few_args/error-libsass
+Error: Function alpha is missing argument $color.
+        on line 1 of input.scss
+>> a {b: alpha()}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/too_many_args/options.yml
+---
+:todo:
+- sass/dart-sass#700
+
+<===> error/too_many_args/input.scss
+a {b: alpha(red, green)}
+
+<===> error/too_many_args/error
+Error: Only 1 argument allowed, but 2 were passed.
+  ,
+1 | a {b: alpha(red, green)}
+  |       ^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_many_args/error-libsass
+Error: wrong number of arguments (2 for 1) for `alpha'
+        on line 1:7 of input.scss
+>> a {b: alpha(red, green)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/type/options.yml
+---
+:todo:
+- sass/libsass#2898
+
+<===> error/type/input.scss
+a {b: alpha(1)}
+
+<===> error/type/error
+Error: $color: 1 is not a color.
+  ,
+1 | a {b: alpha(1)}
+  |       ^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===>
+================================================================================
+<===> error/quoted_string/options.yml
+---
+:todo:
+- sass/libsass#2898
+
+<===> error/quoted_string/input.scss
+a {b: alpha("c=d")}
+
+<===> error/quoted_string/error
+Error: $color: "c=d" is not a color.
+  ,
+1 | a {b: alpha("c=d")}
+  |       ^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===>
+================================================================================
+<===> error/unquoted_string/no_equals/options.yml
+---
+:todo:
+- sass/libsass#2898
+
+<===> error/unquoted_string/no_equals/input.scss
+a {b: alpha(cd)}
+
+<===> error/unquoted_string/no_equals/error
+Error: $color: cd is not a color.
+  ,
+1 | a {b: alpha(cd)}
+  |       ^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===>
+================================================================================
+<===> error/unquoted_string/non_identifier_before_equals/options.yml
+---
+:todo:
+- sass/libsass#2898
+
+<===> error/unquoted_string/non_identifier_before_equals/input.scss
+a {b: alpha(unquote("1=c"))}
+
+<===> error/unquoted_string/non_identifier_before_equals/error
+Error: $color: 1=c is not a color.
+  ,
+1 | a {b: alpha(unquote("1=c"))}
+  |       ^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
diff --git a/spec/core_functions/color/blue.hrx b/spec/core_functions/color/blue.hrx
new file mode 100644
index 0000000000..e3a4cec199
--- /dev/null
+++ b/spec/core_functions/color/blue.hrx
@@ -0,0 +1,98 @@
+<===> max/input.scss
+a {b: blue(rgb(0, 0, 255))}
+
+<===> max/output.css
+a {
+  b: 255;
+}
+
+<===>
+================================================================================
+<===> min/input.scss
+a {b: blue(rgb(0, 0, 0))}
+
+<===> min/output.css
+a {
+  b: 0;
+}
+
+<===>
+================================================================================
+<===> middle/input.scss
+a {b: blue(rgb(0, 0, 123))}
+
+<===> middle/output.css
+a {
+  b: 123;
+}
+
+<===>
+================================================================================
+<===> named/input.scss
+a {b: blue($color: rgb(0, 0, 234))}
+
+<===> named/output.css
+a {
+  b: 234;
+}
+
+<===>
+================================================================================
+<===> error/too_few_args/input.scss
+a {b: blue()}
+
+<===> error/too_few_args/error
+Error: Missing argument $color.
+  ,
+1 | a {b: blue()}
+  |       ^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_few_args/error-libsass
+Error: Function blue is missing argument $color.
+        on line 1 of input.scss
+>> a {b: blue()}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/too_many_args/input.scss
+a {b: blue(red, green)}
+
+<===> error/too_many_args/error
+Error: Only 1 argument allowed, but 2 were passed.
+  ,
+1 | a {b: blue(red, green)}
+  |       ^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_many_args/error-libsass
+Error: wrong number of arguments (2 for 1) for `blue'
+        on line 1:7 of input.scss
+>> a {b: blue(red, green)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/type/input.scss
+a {b: blue(1)}
+
+<===> error/type/error
+Error: $color: 1 is not a color.
+  ,
+1 | a {b: blue(1)}
+  |       ^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/type/error-libsass
+Error: argument `$color` of `blue($color)` must be a color
+        on line 1:7 of input.scss, in function `blue`
+        from line 1:7 of input.scss
+>> a {b: blue(1)}
+
+   ------^
diff --git a/spec/core_functions/color/complement.hrx b/spec/core_functions/color/complement.hrx
new file mode 100644
index 0000000000..700e7e2f4b
--- /dev/null
+++ b/spec/core_functions/color/complement.hrx
@@ -0,0 +1,138 @@
+<===> red/input.scss
+a {b: complement(red)}
+
+<===> red/output.css
+a {
+  b: aqua;
+}
+
+<===> red/output-libsass.css
+a {
+  b: cyan;
+}
+
+<===>
+================================================================================
+<===> turquoise/input.scss
+a {b: complement(turquoise)}
+
+<===> turquoise/output.css
+a {
+  b: #e04050;
+}
+
+<===>
+================================================================================
+<===> grayscale/gray/input.scss
+a {b: complement(gray)}
+
+<===> grayscale/gray/output.css
+a {
+  b: gray;
+}
+
+<===>
+================================================================================
+<===> grayscale/white/input.scss
+a {b: complement(white)}
+
+<===> grayscale/white/output.css
+a {
+  b: white;
+}
+
+<===>
+================================================================================
+<===> grayscale/black/input.scss
+a {b: complement(black)}
+
+<===> grayscale/black/output.css
+a {
+  b: black;
+}
+
+<===>
+================================================================================
+<===> alpha/input.scss
+a {b: complement(rgba(turquoise, 0.7))}
+
+<===> alpha/output.css
+a {
+  b: rgba(224, 64, 80, 0.7);
+}
+
+<===>
+================================================================================
+<===> named/input.scss
+a {b: complement($color: red)}
+
+<===> named/output.css
+a {
+  b: aqua;
+}
+
+<===> named/output-libsass.css
+a {
+  b: cyan;
+}
+
+<===>
+================================================================================
+<===> error/too_few_args/input.scss
+a {b: complement()}
+
+<===> error/too_few_args/error
+Error: Missing argument $color.
+  ,
+1 | a {b: complement()}
+  |       ^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_few_args/error-libsass
+Error: Function complement is missing argument $color.
+        on line 1 of input.scss
+>> a {b: complement()}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/too_many_args/input.scss
+a {b: complement(red, 1)}
+
+<===> error/too_many_args/error
+Error: Only 1 argument allowed, but 2 were passed.
+  ,
+1 | a {b: complement(red, 1)}
+  |       ^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_many_args/error-libsass
+Error: wrong number of arguments (2 for 1) for `complement'
+        on line 1:7 of input.scss
+>> a {b: complement(red, 1)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/type/input.scss
+a {b: complement(1)}
+
+<===> error/type/error
+Error: $color: 1 is not a color.
+  ,
+1 | a {b: complement(1)}
+  |       ^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/type/error-libsass
+Error: argument `$color` of `complement($color)` must be a color
+        on line 1:7 of input.scss, in function `complement`
+        from line 1:7 of input.scss
+>> a {b: complement(1)}
+
+   ------^
diff --git a/spec/core_functions/color/darken.hrx b/spec/core_functions/color/darken.hrx
new file mode 100644
index 0000000000..1518ac793e
--- /dev/null
+++ b/spec/core_functions/color/darken.hrx
@@ -0,0 +1,191 @@
+<===> max/input.scss
+a {b: darken(red, 100%)}
+
+<===> max/output.css
+a {
+  b: black;
+}
+
+<===>
+================================================================================
+<===> max_remaining/input.scss
+a {b: darken(red, 50%)}
+
+<===> max_remaining/output.css
+a {
+  b: black;
+}
+
+<===>
+================================================================================
+<===> min/input.scss
+a {b: darken(red, 0%)}
+
+<===> min/output.css
+a {
+  b: red;
+}
+
+<===>
+================================================================================
+<===> middle/input.scss
+a {b: darken(red, 14%)}
+
+<===> middle/output.css
+a {
+  b: #b80000;
+}
+
+<===>
+================================================================================
+<===> fraction/input.scss
+a {b: darken(red, 0.5%)}
+
+<===> fraction/output.css
+a {
+  b: #fc0000;
+}
+
+<===>
+================================================================================
+<===> alpha/input.scss
+a {b: darken(rgba(red, 0.2), 100%)}
+
+<===> alpha/output.css
+a {
+  b: rgba(0, 0, 0, 0.2);
+}
+
+<===>
+================================================================================
+<===> named/input.scss
+a {b: darken($color: red, $amount: 14%)}
+
+<===> named/output.css
+a {
+  b: #b80000;
+}
+
+<===>
+================================================================================
+<===> error/too_few_args/input.scss
+a {b: darken(red)}
+
+<===> error/too_few_args/error
+Error: Missing argument $amount.
+  ,
+1 | a {b: darken(red)}
+  |       ^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_few_args/error-libsass
+Error: Function darken is missing argument $amount.
+        on line 1 of input.scss
+>> a {b: darken(red)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/too_many_args/input.scss
+a {b: darken(red, 1%, 2)}
+
+<===> error/too_many_args/error
+Error: Only 2 arguments allowed, but 3 were passed.
+  ,
+1 | a {b: darken(red, 1%, 2)}
+  |       ^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_many_args/error-libsass
+Error: wrong number of arguments (3 for 2) for `darken'
+        on line 1:7 of input.scss
+>> a {b: darken(red, 1%, 2)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/type/color/input.scss
+a {b: darken(1, 2)}
+
+<===> error/type/color/error
+Error: $color: 1 is not a color.
+  ,
+1 | a {b: darken(1, 2)}
+  |       ^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/type/color/error-libsass
+Error: argument `$color` of `darken($color, $amount)` must be a color
+        on line 1:7 of input.scss, in function `darken`
+        from line 1:7 of input.scss
+>> a {b: darken(1, 2)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/type/lightness/input.scss
+a {b: darken(red, blue)}
+
+<===> error/type/lightness/error
+Error: $amount: blue is not a number.
+  ,
+1 | a {b: darken(red, blue)}
+  |       ^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/type/lightness/error-libsass
+Error: argument `$amount` of `darken($color, $amount)` must be a number
+        on line 1:7 of input.scss, in function `darken`
+        from line 1:7 of input.scss
+>> a {b: darken(red, blue)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/bounds/too_low/input.scss
+a {b: darken(red, -0.001)}
+
+<===> error/bounds/too_low/error
+Error: Expected -0.001 to be within 0 and 100.
+  ,
+1 | a {b: darken(red, -0.001)}
+  |       ^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/bounds/too_low/error-libsass
+Error: argument `$amount` of `darken($color, $amount)` must be between -0 and 100
+        on line 1:7 of input.scss, in function `darken`
+        from line 1:7 of input.scss
+>> a {b: darken(red, -0.001)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/bounds/too_high/input.scss
+a {b: darken(red, 100.001)}
+
+<===> error/bounds/too_high/error
+Error: Expected 100.001 to be within 0 and 100.
+  ,
+1 | a {b: darken(red, 100.001)}
+  |       ^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/bounds/too_high/error-libsass
+Error: argument `$amount` of `darken($color, $amount)` must be between -0 and 100
+        on line 1:7 of input.scss, in function `darken`
+        from line 1:7 of input.scss
+>> a {b: darken(red, 100.001)}
+
+   ------^
diff --git a/spec/core_functions/color/desaturate.hrx b/spec/core_functions/color/desaturate.hrx
new file mode 100644
index 0000000000..e350a6c651
--- /dev/null
+++ b/spec/core_functions/color/desaturate.hrx
@@ -0,0 +1,201 @@
+<===> max/input.scss
+a {b: desaturate(plum, 100%)}
+
+<===> max/output.css
+a {
+  b: #bfbfbf;
+}
+
+<===>
+================================================================================
+<===> max_remaining/input.scss
+a {b: desaturate(plum, 48%)}
+
+<===> max_remaining/output.css
+a {
+  b: #bfbfbf;
+}
+
+<===>
+================================================================================
+<===> min/input.scss
+a {b: desaturate(plum, 0%)}
+
+<===> min/output.css
+a {
+  b: plum;
+}
+
+<===>
+================================================================================
+<===> middle/input.scss
+a {b: desaturate(plum, 14%)}
+
+<===> middle/output.css
+a {
+  b: #d4a9d4;
+}
+
+<===>
+================================================================================
+<===> alpha/input.scss
+a {b: desaturate(rgba(plum, 0.3), 100%)}
+
+<===> alpha/output.css
+a {
+  b: rgba(191, 191, 191, 0.3);
+}
+
+<===>
+================================================================================
+<===> named/input.scss
+a {b: desaturate($color: plum, $amount: 14%)}
+
+<===> named/output.css
+a {
+  b: #d4a9d4;
+}
+
+<===>
+================================================================================
+<===> error/too_few_args/input.scss
+a {b: desaturate(plum)}
+
+<===> error/too_few_args/error
+Error: Missing argument $amount.
+  ,
+1 | a {b: desaturate(plum)}
+  |       ^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_few_args/error-libsass
+Error: Function desaturate is missing argument $amount.
+        on line 1 of input.scss
+>> a {b: desaturate(plum)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/too_many_args/input.scss
+a {b: desaturate(plum, 1%, 2)}
+
+<===> error/too_many_args/error
+Error: Only 2 arguments allowed, but 3 were passed.
+  ,
+1 | a {b: desaturate(plum, 1%, 2)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_many_args/error-libsass
+Error: wrong number of arguments (3 for 2) for `desaturate'
+        on line 1:7 of input.scss
+>> a {b: desaturate(plum, 1%, 2)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/one_arg/type/input.scss
+a {b: desaturate(red)}
+
+<===> error/one_arg/type/error
+Error: Missing argument $amount.
+  ,
+1 | a {b: desaturate(red)}
+  |       ^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/one_arg/type/error-libsass
+Error: Function desaturate is missing argument $amount.
+        on line 1 of input.scss
+>> a {b: desaturate(red)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/type/color/input.scss
+a {b: desaturate(1, 2)}
+
+<===> error/type/color/error
+Error: $color: 1 is not a color.
+  ,
+1 | a {b: desaturate(1, 2)}
+  |       ^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/type/color/error-libsass
+Error: argument `$color` of `desaturate($color, $amount)` must be a color
+        on line 1:7 of input.scss, in function `desaturate`
+        from line 1:7 of input.scss
+>> a {b: desaturate(1, 2)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/type/lightness/input.scss
+a {b: desaturate(plum, blue)}
+
+<===> error/type/lightness/error
+Error: $amount: blue is not a number.
+  ,
+1 | a {b: desaturate(plum, blue)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/type/lightness/error-libsass
+Error: argument `$amount` of `desaturate($color, $amount)` must be a number
+        on line 1:7 of input.scss, in function `desaturate`
+        from line 1:7 of input.scss
+>> a {b: desaturate(plum, blue)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/bounds/too_low/input.scss
+a {b: desaturate(plum, -0.001)}
+
+<===> error/bounds/too_low/error
+Error: Expected -0.001 to be within 0 and 100.
+  ,
+1 | a {b: desaturate(plum, -0.001)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/bounds/too_low/error-libsass
+Error: argument `$amount` of `desaturate($color, $amount)` must be between -0 and 100
+        on line 1:7 of input.scss, in function `desaturate`
+        from line 1:7 of input.scss
+>> a {b: desaturate(plum, -0.001)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/bounds/too_high/input.scss
+a {b: desaturate(plum, 100.001)}
+
+<===> error/bounds/too_high/error
+Error: Expected 100.001 to be within 0 and 100.
+  ,
+1 | a {b: desaturate(plum, 100.001)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/bounds/too_high/error-libsass
+Error: argument `$amount` of `desaturate($color, $amount)` must be between -0 and 100
+        on line 1:7 of input.scss, in function `desaturate`
+        from line 1:7 of input.scss
+>> a {b: desaturate(plum, 100.001)}
+
+   ------^
diff --git a/spec/core_functions/color/fade_in.hrx b/spec/core_functions/color/fade_in.hrx
new file mode 100644
index 0000000000..4fee7ab37a
--- /dev/null
+++ b/spec/core_functions/color/fade_in.hrx
@@ -0,0 +1,181 @@
+<===> max/input.scss
+a {b: fade-in(rgba(red, 0.5), 1)}
+
+<===> max/output.css
+a {
+  b: red;
+}
+
+<===>
+================================================================================
+<===> max_remaining/input.scss
+a {b: fade-in(rgba(red, 0.5), 0.5)}
+
+<===> max_remaining/output.css
+a {
+  b: red;
+}
+
+<===>
+================================================================================
+<===> min/input.scss
+a {b: fade-in(rgba(red, 0.5), 0)}
+
+<===> min/output.css
+a {
+  b: rgba(255, 0, 0, 0.5);
+}
+
+<===>
+================================================================================
+<===> middle/input.scss
+a {b: fade-in(rgba(red, 0.5), 0.14)}
+
+<===> middle/output.css
+a {
+  b: rgba(255, 0, 0, 0.64);
+}
+
+<===>
+================================================================================
+<===> named/input.scss
+a {b: fade-in($color: rgba(red, 0.5), $amount: 0.14)}
+
+<===> named/output.css
+a {
+  b: rgba(255, 0, 0, 0.64);
+}
+
+<===>
+================================================================================
+<===> opacify/input.scss
+a {b: opacify($color: rgba(red, 0.5), $amount: 0.14)}
+
+<===> opacify/output.css
+a {
+  b: rgba(255, 0, 0, 0.64);
+}
+
+<===>
+================================================================================
+<===> error/too_few_args/input.scss
+a {b: fade-in(red)}
+
+<===> error/too_few_args/error
+Error: Missing argument $amount.
+  ,
+1 | a {b: fade-in(red)}
+  |       ^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_few_args/error-libsass
+Error: Function fade-in is missing argument $amount.
+        on line 1 of input.scss
+>> a {b: fade-in(red)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/too_many_args/input.scss
+a {b: fade-in(red, 0.1, 2)}
+
+<===> error/too_many_args/error
+Error: Only 2 arguments allowed, but 3 were passed.
+  ,
+1 | a {b: fade-in(red, 0.1, 2)}
+  |       ^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_many_args/error-libsass
+Error: wrong number of arguments (3 for 2) for `fade-in'
+        on line 1:7 of input.scss
+>> a {b: fade-in(red, 0.1, 2)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/type/color/input.scss
+a {b: fade-in(1, 0.1)}
+
+<===> error/type/color/error
+Error: $color: 1 is not a color.
+  ,
+1 | a {b: fade-in(1, 0.1)}
+  |       ^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/type/color/error-libsass
+Error: argument `$color` of `fade-in($color, $amount)` must be a color
+        on line 1:7 of input.scss, in function `fade-in`
+        from line 1:7 of input.scss
+>> a {b: fade-in(1, 0.1)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/type/alpha/input.scss
+a {b: fade-in(red, blue)}
+
+<===> error/type/alpha/error
+Error: $amount: blue is not a number.
+  ,
+1 | a {b: fade-in(red, blue)}
+  |       ^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/type/alpha/error-libsass
+Error: argument `$amount` of `fade-in($color, $amount)` must be a number
+        on line 1:7 of input.scss, in function `fade-in`
+        from line 1:7 of input.scss
+>> a {b: fade-in(red, blue)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/bounds/too_low/input.scss
+a {b: fade-in(red, -0.001)}
+
+<===> error/bounds/too_low/error
+Error: Expected -0.001 to be within 0 and 1.
+  ,
+1 | a {b: fade-in(red, -0.001)}
+  |       ^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/bounds/too_low/error-libsass
+Error: argument `$amount` of `fade-in($color, $amount)` must be between -0 and 1
+        on line 1:7 of input.scss, in function `fade-in`
+        from line 1:7 of input.scss
+>> a {b: fade-in(red, -0.001)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/bounds/too_high/input.scss
+a {b: fade-in(red, 1.001)}
+
+<===> error/bounds/too_high/error
+Error: Expected 1.001 to be within 0 and 1.
+  ,
+1 | a {b: fade-in(red, 1.001)}
+  |       ^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/bounds/too_high/error-libsass
+Error: argument `$amount` of `fade-in($color, $amount)` must be between -0 and 1
+        on line 1:7 of input.scss, in function `fade-in`
+        from line 1:7 of input.scss
+>> a {b: fade-in(red, 1.001)}
+
+   ------^
diff --git a/spec/core_functions/color/fade_out.hrx b/spec/core_functions/color/fade_out.hrx
new file mode 100644
index 0000000000..32c3bd57ef
--- /dev/null
+++ b/spec/core_functions/color/fade_out.hrx
@@ -0,0 +1,181 @@
+<===> max/input.scss
+a {b: fade-out(rgba(red, 0.5), 1)}
+
+<===> max/output.css
+a {
+  b: rgba(255, 0, 0, 0);
+}
+
+<===>
+================================================================================
+<===> max_remaining/input.scss
+a {b: fade-out(rgba(red, 0.5), 0.5)}
+
+<===> max_remaining/output.css
+a {
+  b: rgba(255, 0, 0, 0);
+}
+
+<===>
+================================================================================
+<===> min/input.scss
+a {b: fade-out(rgba(red, 0.5), 0)}
+
+<===> min/output.css
+a {
+  b: rgba(255, 0, 0, 0.5);
+}
+
+<===>
+================================================================================
+<===> middle/input.scss
+a {b: fade-out(rgba(red, 0.5), 0.14)}
+
+<===> middle/output.css
+a {
+  b: rgba(255, 0, 0, 0.36);
+}
+
+<===>
+================================================================================
+<===> named/input.scss
+a {b: fade-out($color: rgba(red, 0.5), $amount: 0.14)}
+
+<===> named/output.css
+a {
+  b: rgba(255, 0, 0, 0.36);
+}
+
+<===>
+================================================================================
+<===> transparentize/input.scss
+a {b: transparentize($color: rgba(red, 0.5), $amount: 0.14)}
+
+<===> transparentize/output.css
+a {
+  b: rgba(255, 0, 0, 0.36);
+}
+
+<===>
+================================================================================
+<===> error/too_few_args/input.scss
+a {b: fade-out(red)}
+
+<===> error/too_few_args/error
+Error: Missing argument $amount.
+  ,
+1 | a {b: fade-out(red)}
+  |       ^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_few_args/error-libsass
+Error: Function fade-out is missing argument $amount.
+        on line 1 of input.scss
+>> a {b: fade-out(red)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/too_many_args/input.scss
+a {b: fade-out(red, 0.1, 2)}
+
+<===> error/too_many_args/error
+Error: Only 2 arguments allowed, but 3 were passed.
+  ,
+1 | a {b: fade-out(red, 0.1, 2)}
+  |       ^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_many_args/error-libsass
+Error: wrong number of arguments (3 for 2) for `fade-out'
+        on line 1:7 of input.scss
+>> a {b: fade-out(red, 0.1, 2)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/type/color/input.scss
+a {b: fade-out(1, 0.1)}
+
+<===> error/type/color/error
+Error: $color: 1 is not a color.
+  ,
+1 | a {b: fade-out(1, 0.1)}
+  |       ^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/type/color/error-libsass
+Error: argument `$color` of `fade-out($color, $amount)` must be a color
+        on line 1:7 of input.scss, in function `fade-out`
+        from line 1:7 of input.scss
+>> a {b: fade-out(1, 0.1)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/type/alpha/input.scss
+a {b: fade-out(red, blue)}
+
+<===> error/type/alpha/error
+Error: $amount: blue is not a number.
+  ,
+1 | a {b: fade-out(red, blue)}
+  |       ^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/type/alpha/error-libsass
+Error: argument `$amount` of `fade-out($color, $amount)` must be a number
+        on line 1:7 of input.scss, in function `fade-out`
+        from line 1:7 of input.scss
+>> a {b: fade-out(red, blue)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/bounds/too_low/input.scss
+a {b: fade-out(red, -0.001)}
+
+<===> error/bounds/too_low/error
+Error: Expected -0.001 to be within 0 and 1.
+  ,
+1 | a {b: fade-out(red, -0.001)}
+  |       ^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/bounds/too_low/error-libsass
+Error: argument `$amount` of `fade-out($color, $amount)` must be between -0 and 1
+        on line 1:7 of input.scss, in function `fade-out`
+        from line 1:7 of input.scss
+>> a {b: fade-out(red, -0.001)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/bounds/too_high/input.scss
+a {b: fade-out(red, 1.001)}
+
+<===> error/bounds/too_high/error
+Error: Expected 1.001 to be within 0 and 1.
+  ,
+1 | a {b: fade-out(red, 1.001)}
+  |       ^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/bounds/too_high/error-libsass
+Error: argument `$amount` of `fade-out($color, $amount)` must be between -0 and 1
+        on line 1:7 of input.scss, in function `fade-out`
+        from line 1:7 of input.scss
+>> a {b: fade-out(red, 1.001)}
+
+   ------^
diff --git a/spec/core_functions/color/grayscale.hrx b/spec/core_functions/color/grayscale.hrx
new file mode 100644
index 0000000000..40b1cfa6dc
--- /dev/null
+++ b/spec/core_functions/color/grayscale.hrx
@@ -0,0 +1,139 @@
+<===> no_saturation/white/input.scss
+a {b: grayscale(white)}
+
+<===> no_saturation/white/output.css
+a {
+  b: white;
+}
+
+<===>
+================================================================================
+<===> no_saturation/black/input.scss
+a {b: grayscale(black)}
+
+<===> no_saturation/black/output.css
+a {
+  b: black;
+}
+
+<===>
+================================================================================
+<===> no_saturation/gray/input.scss
+a {b: grayscale(#494949)}
+
+<===> no_saturation/gray/output.css
+a {
+  b: #494949;
+}
+
+<===>
+================================================================================
+<===> max_saturation/input.scss
+a {b: grayscale(red)}
+
+<===> max_saturation/output.css
+a {
+  b: gray;
+}
+
+<===>
+================================================================================
+<===> mid_saturation/input.scss
+a {b: grayscale(#633736)}
+
+<===> mid_saturation/output.css
+a {
+  b: #4d4d4d;
+}
+
+<===>
+================================================================================
+<===> alpha/input.scss
+a {b: grayscale(rgba(#633736, 0.3))}
+
+<===> alpha/output.css
+a {
+  b: rgba(77, 77, 77, 0.3);
+}
+
+<===>
+================================================================================
+<===> number/input.scss
+// A number should produce a plain function string, for CSS filter functions.
+a {b: grayscale(15%)}
+
+<===> number/output.css
+a {
+  b: grayscale(15%);
+}
+
+<===>
+================================================================================
+<===> named/input.scss
+a {b: grayscale($color: white)}
+
+<===> named/output.css
+a {
+  b: white;
+}
+
+<===>
+================================================================================
+<===> error/too_few_args/input.scss
+a {b: grayscale()}
+
+<===> error/too_few_args/error
+Error: Missing argument $color.
+  ,
+1 | a {b: grayscale()}
+  |       ^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_few_args/error-libsass
+Error: Function grayscale is missing argument $color.
+        on line 1 of input.scss
+>> a {b: grayscale()}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/too_many_args/input.scss
+a {b: grayscale(red, 1)}
+
+<===> error/too_many_args/error
+Error: Only 1 argument allowed, but 2 were passed.
+  ,
+1 | a {b: grayscale(red, 1)}
+  |       ^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_many_args/error-libsass
+Error: wrong number of arguments (2 for 1) for `grayscale'
+        on line 1:7 of input.scss
+>> a {b: grayscale(red, 1)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/type/input.scss
+a {b: grayscale(c)}
+
+<===> error/type/error
+Error: $color: c is not a color.
+  ,
+1 | a {b: grayscale(c)}
+  |       ^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/type/error-libsass
+Error: argument `$color` of `grayscale($color)` must be a color
+        on line 1:7 of input.scss, in function `grayscale`
+        from line 1:7 of input.scss
+>> a {b: grayscale(c)}
+
+   ------^
diff --git a/spec/core_functions/color/green.hrx b/spec/core_functions/color/green.hrx
new file mode 100644
index 0000000000..85213268af
--- /dev/null
+++ b/spec/core_functions/color/green.hrx
@@ -0,0 +1,98 @@
+<===> max/input.scss
+a {b: green(rgb(0, 255, 0))}
+
+<===> max/output.css
+a {
+  b: 255;
+}
+
+<===>
+================================================================================
+<===> min/input.scss
+a {b: green(rgb(0, 0, 0))}
+
+<===> min/output.css
+a {
+  b: 0;
+}
+
+<===>
+================================================================================
+<===> middle/input.scss
+a {b: green(rgb(0, 123, 0))}
+
+<===> middle/output.css
+a {
+  b: 123;
+}
+
+<===>
+================================================================================
+<===> named/input.scss
+a {b: green($color: rgb(0, 234, 0))}
+
+<===> named/output.css
+a {
+  b: 234;
+}
+
+<===>
+================================================================================
+<===> error/too_few_args/input.scss
+a {b: green()}
+
+<===> error/too_few_args/error
+Error: Missing argument $color.
+  ,
+1 | a {b: green()}
+  |       ^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_few_args/error-libsass
+Error: Function green is missing argument $color.
+        on line 1 of input.scss
+>> a {b: green()}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/too_many_args/input.scss
+a {b: green(red, green)}
+
+<===> error/too_many_args/error
+Error: Only 1 argument allowed, but 2 were passed.
+  ,
+1 | a {b: green(red, green)}
+  |       ^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_many_args/error-libsass
+Error: wrong number of arguments (2 for 1) for `green'
+        on line 1:7 of input.scss
+>> a {b: green(red, green)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/type/input.scss
+a {b: green(1)}
+
+<===> error/type/error
+Error: $color: 1 is not a color.
+  ,
+1 | a {b: green(1)}
+  |       ^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/type/error-libsass
+Error: argument `$color` of `green($color)` must be a color
+        on line 1:7 of input.scss, in function `green`
+        from line 1:7 of input.scss
+>> a {b: green(1)}
+
+   ------^
diff --git a/spec/core_functions/color/hsl/basic/output-libsass.css b/spec/core_functions/color/hsl/basic/output-libsass.css
deleted file mode 100644
index d95475d953..0000000000
--- a/spec/core_functions/color/hsl/basic/output-libsass.css
+++ /dev/null
@@ -1,220 +0,0 @@
-hue red {
-  hue-0: red;
-  hue--360: red;
-  hue-260: #5500ff;
-  hue-6120: red;
-}
-
-hue yellow {
-  hue-60: yellow;
-  hue--300: yellow;
-  hue-420: yellow;
-  hue--9660: yellow;
-}
-
-hue green {
-  hue-120: lime;
-  hue--240: lime;
-  hue-480: lime;
-  hue-99840: lime;
-}
-
-hue cyan {
-  hue-180: cyan;
-  hue--180: cyan;
-  hue-540: cyan;
-  hue--900: cyan;
-}
-
-hue blue {
-  hue-240: blue;
-  hue--120: blue;
-  hue-600: blue;
-  hue--104880: blue;
-}
-
-hue purple {
-  hue-300: magenta;
-  hue--60: magenta;
-  hue-660: magenta;
-  hue-2820: magenta;
-}
-
-red-to-green {
-  step-1: red;
-  step-2: #ff3300;
-  step-3: #ff6600;
-  step-4: #ff9900;
-  step-5: #ffcc00;
-  step-6: yellow;
-  step-7: #ccff00;
-  step-8: #99ff00;
-  step-9: #66ff00;
-  step-10: #33ff00;
-  step-11: lime;
-}
-
-green-to-blue {
-  step-1: lime;
-  step-2: #00ff33;
-  step-3: #00ff66;
-  step-4: #00ff99;
-  step-5: #00ffcc;
-  step-6: cyan;
-  step-7: #00ccff;
-  step-8: #0099ff;
-  step-9: #0066ff;
-  step-10: #0033ff;
-  step-11: blue;
-}
-
-blue-to-red {
-  step-1: blue;
-  step-2: #3300ff;
-  step-3: #6600ff;
-  step-4: #9900ff;
-  step-5: #cc00ff;
-  step-6: magenta;
-  step-7: #ff00cc;
-  step-8: #ff0099;
-  step-9: #ff0066;
-  step-10: #ff0033;
-  step-11: red;
-}
-
-gray-to red {
-  step-1: #996666;
-  step-2: #cc3333;
-  step-3: red;
-}
-
-gray-to yellow {
-  step-1: #999966;
-  step-2: #cccc33;
-  step-3: yellow;
-}
-
-gray-to green {
-  step-1: #669966;
-  step-2: #33cc33;
-  step-3: lime;
-}
-
-gray-to cyan {
-  step-1: #669999;
-  step-2: #33cccc;
-  step-3: cyan;
-}
-
-gray-to blue {
-  step-1: #666699;
-  step-2: #3333cc;
-  step-3: blue;
-}
-
-gray-to purple {
-  step-1: #996699;
-  step-2: #cc33cc;
-  step-3: magenta;
-}
-
-black-to-white-through red {
-  step-1: black;
-  step-2: #330000;
-  step-3: #660000;
-  step-4: #990000;
-  step-5: #cc0000;
-  step-6: red;
-  step-7: #ff3333;
-  step-8: #ff6666;
-  step-9: #ff9999;
-  step-10: #ffcccc;
-  step-11: white;
-}
-
-black-to-white-through yellow {
-  step-1: black;
-  step-2: #333300;
-  step-3: #666600;
-  step-4: #999900;
-  step-5: #cccc00;
-  step-6: yellow;
-  step-7: #ffff33;
-  step-8: #ffff66;
-  step-9: #ffff99;
-  step-10: #ffffcc;
-  step-11: white;
-}
-
-black-to-white-through green {
-  step-1: black;
-  step-2: #003300;
-  step-3: #006600;
-  step-4: #009900;
-  step-5: #00cc00;
-  step-6: lime;
-  step-7: #33ff33;
-  step-8: #66ff66;
-  step-9: #99ff99;
-  step-10: #ccffcc;
-  step-11: white;
-}
-
-black-to-white-through cyan {
-  step-1: black;
-  step-2: #003333;
-  step-3: #006666;
-  step-4: #009999;
-  step-5: #00cccc;
-  step-6: cyan;
-  step-7: #33ffff;
-  step-8: #66ffff;
-  step-9: #99ffff;
-  step-10: #ccffff;
-  step-11: white;
-}
-
-black-to-white-through blue {
-  step-1: black;
-  step-2: #000033;
-  step-3: #000066;
-  step-4: #000099;
-  step-5: #0000cc;
-  step-6: blue;
-  step-7: #3333ff;
-  step-8: #6666ff;
-  step-9: #9999ff;
-  step-10: #ccccff;
-  step-11: white;
-}
-
-black-to-white-through purple {
-  step-1: black;
-  step-2: #330033;
-  step-3: #660066;
-  step-4: #990099;
-  step-5: #cc00cc;
-  step-6: magenta;
-  step-7: #ff33ff;
-  step-8: #ff66ff;
-  step-9: #ff99ff;
-  step-10: #ffccff;
-  step-11: white;
-}
-
-clamped {
-  saturation-above: red;
-  saturation-below: gray;
-  lightness-above: white;
-  lightness-below: black;
-}
-
-units {
-  hue-deg: red;
-  saturation-unitless: #bf4040;
-  lightness-unitless: red;
-}
-
-named {
-  x: red;
-}
diff --git a/spec/core_functions/color/hsl/basic/output-ruby-sass.css b/spec/core_functions/color/hsl/basic/output-ruby-sass.css
deleted file mode 100644
index 8f121440cd..0000000000
--- a/spec/core_functions/color/hsl/basic/output-ruby-sass.css
+++ /dev/null
@@ -1,205 +0,0 @@
-hue red {
-  hue-0: red;
-  hue--360: red;
-  hue-260: #5500ff;
-  hue-6120: red;
-}
-hue yellow {
-  hue-60: yellow;
-  hue--300: yellow;
-  hue-420: yellow;
-  hue--9660: yellow;
-}
-hue green {
-  hue-120: lime;
-  hue--240: lime;
-  hue-480: lime;
-  hue-99840: lime;
-}
-hue cyan {
-  hue-180: cyan;
-  hue--180: cyan;
-  hue-540: cyan;
-  hue--900: cyan;
-}
-hue blue {
-  hue-240: blue;
-  hue--120: blue;
-  hue-600: blue;
-  hue--104880: blue;
-}
-hue purple {
-  hue-300: magenta;
-  hue--60: magenta;
-  hue-660: magenta;
-  hue-2820: magenta;
-}
-
-red-to-green {
-  step-1: red;
-  step-2: #ff3300;
-  step-3: #ff6600;
-  step-4: #ff9900;
-  step-5: #ffcc00;
-  step-6: yellow;
-  step-7: #ccff00;
-  step-8: #99ff00;
-  step-9: #66ff00;
-  step-10: #33ff00;
-  step-11: lime;
-}
-
-green-to-blue {
-  step-1: lime;
-  step-2: #00ff33;
-  step-3: #00ff66;
-  step-4: #00ff99;
-  step-5: #00ffcc;
-  step-6: cyan;
-  step-7: #00ccff;
-  step-8: #0099ff;
-  step-9: #0066ff;
-  step-10: #0033ff;
-  step-11: blue;
-}
-
-blue-to-red {
-  step-1: blue;
-  step-2: #3300ff;
-  step-3: #6600ff;
-  step-4: #9900ff;
-  step-5: #cc00ff;
-  step-6: magenta;
-  step-7: #ff00cc;
-  step-8: #ff0099;
-  step-9: #ff0066;
-  step-10: #ff0033;
-  step-11: red;
-}
-
-gray-to red {
-  step-1: #996666;
-  step-2: #cc3333;
-  step-3: red;
-}
-gray-to yellow {
-  step-1: #999966;
-  step-2: #cccc33;
-  step-3: yellow;
-}
-gray-to green {
-  step-1: #669966;
-  step-2: #33cc33;
-  step-3: lime;
-}
-gray-to cyan {
-  step-1: #669999;
-  step-2: #33cccc;
-  step-3: cyan;
-}
-gray-to blue {
-  step-1: #666699;
-  step-2: #3333cc;
-  step-3: blue;
-}
-gray-to purple {
-  step-1: #996699;
-  step-2: #cc33cc;
-  step-3: magenta;
-}
-
-black-to-white-through red {
-  step-1: black;
-  step-2: #330000;
-  step-3: #660000;
-  step-4: #990000;
-  step-5: #cc0000;
-  step-6: red;
-  step-7: #ff3333;
-  step-8: #ff6666;
-  step-9: #ff9999;
-  step-10: #ffcccc;
-  step-11: white;
-}
-black-to-white-through yellow {
-  step-1: black;
-  step-2: #333300;
-  step-3: #666600;
-  step-4: #999900;
-  step-5: #cccc00;
-  step-6: yellow;
-  step-7: #ffff33;
-  step-8: #ffff66;
-  step-9: #ffff99;
-  step-10: #ffffcc;
-  step-11: white;
-}
-black-to-white-through green {
-  step-1: black;
-  step-2: #003300;
-  step-3: #006600;
-  step-4: #009900;
-  step-5: #00cc00;
-  step-6: lime;
-  step-7: #33ff33;
-  step-8: #66ff66;
-  step-9: #99ff99;
-  step-10: #ccffcc;
-  step-11: white;
-}
-black-to-white-through cyan {
-  step-1: black;
-  step-2: #003333;
-  step-3: #006666;
-  step-4: #009999;
-  step-5: #00cccc;
-  step-6: cyan;
-  step-7: #33ffff;
-  step-8: #66ffff;
-  step-9: #99ffff;
-  step-10: #ccffff;
-  step-11: white;
-}
-black-to-white-through blue {
-  step-1: black;
-  step-2: #000033;
-  step-3: #000066;
-  step-4: #000099;
-  step-5: #0000cc;
-  step-6: blue;
-  step-7: #3333ff;
-  step-8: #6666ff;
-  step-9: #9999ff;
-  step-10: #ccccff;
-  step-11: white;
-}
-black-to-white-through purple {
-  step-1: black;
-  step-2: #330033;
-  step-3: #660066;
-  step-4: #990099;
-  step-5: #cc00cc;
-  step-6: magenta;
-  step-7: #ff33ff;
-  step-8: #ff66ff;
-  step-9: #ff99ff;
-  step-10: #ffccff;
-  step-11: white;
-}
-
-clamped {
-  saturation-above: red;
-  saturation-below: gray;
-  lightness-above: white;
-  lightness-below: black;
-}
-
-units {
-  hue-deg: red;
-  saturation-unitless: #bf4040;
-  lightness-unitless: red;
-}
-
-named {
-  x: red;
-}
diff --git a/spec/core_functions/color/hsl/error/four_args.hrx b/spec/core_functions/color/hsl/error/four_args.hrx
index 03aeb7c794..831d57edd8 100644
--- a/spec/core_functions/color/hsl/error/four_args.hrx
+++ b/spec/core_functions/color/hsl/error/four_args.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2722
+- sass/libsass#2722
 
 <===>
 ================================================================================
diff --git a/spec/core_functions/color/hsl/error/one_arg.hrx b/spec/core_functions/color/hsl/error/one_arg.hrx
index 031ed22d03..92d41979f5 100644
--- a/spec/core_functions/color/hsl/error/one_arg.hrx
+++ b/spec/core_functions/color/hsl/error/one_arg.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2722
+- sass/libsass#2722
 
 <===>
 ================================================================================
diff --git a/spec/core_functions/color/hsl/error/two_args.hrx b/spec/core_functions/color/hsl/error/two_args.hrx
index 09446ee4ac..67697c1b83 100644
--- a/spec/core_functions/color/hsl/error/two_args.hrx
+++ b/spec/core_functions/color/hsl/error/two_args.hrx
@@ -1,49 +1,17 @@
-<===> options.yml
----
-:todo:
-- libsass # sass/libsass#2722
+<===> input.scss
+a {b: hsl(#123, 0.5)}
 
-<===>
-================================================================================
-<===> color/type/input.scss
-color-type {
-  x: hsl("foo", 0.5);
-}
-
-<===> color/type/error
+<===> error
 Error: Missing argument $lightness.
   ,
-2 |   x: hsl("foo", 0.5);
-  |      ^^^^^^^^^^^^^^^
+1 | a {b: hsl(#123, 0.5)}
+  |       ^^^^^^^^^^^^^^
   '
-  input.scss 2:6  root stylesheet
-
-<===>
-================================================================================
-<===> alpha/type/input.scss
-alpha-type {
-  x: hsl(#123, "foo");
-}
+  input.scss 1:7  root stylesheet
 
-<===> alpha/type/error
-Error: Missing argument $lightness.
-  ,
-2 |   x: hsl(#123, "foo");
-  |      ^^^^^^^^^^^^^^^^
-  '
-  input.scss 2:6  root stylesheet
+<===> error-libsass
+Error: Function hsl is missing argument $lightness.
+        on line 1 of input.scss
+>> a {b: hsl(#123, 0.5)}
 
-<===>
-================================================================================
-<===> alpha/unit/input.scss
-.alpha-unit {
-  a: hsl(#123, 0.5px);
-}
-
-<===> alpha/unit/error
-Error: Missing argument $lightness.
-  ,
-2 |   a: hsl(#123, 0.5px);
-  |      ^^^^^^^^^^^^^^^^
-  '
-  input.scss 2:6  root stylesheet
+   ------^
diff --git a/spec/core_functions/color/hsl/four_args/alpha.hrx b/spec/core_functions/color/hsl/four_args/alpha.hrx
new file mode 100644
index 0000000000..6e0db589cd
--- /dev/null
+++ b/spec/core_functions/color/hsl/four_args/alpha.hrx
@@ -0,0 +1,97 @@
+<===> percent/negative/input.scss
+a {b: hsl(0, 0, 0, -10%)}
+
+<===> percent/negative/output.css
+a {
+  b: rgba(0, 0, 0, 0);
+}
+
+<===>
+================================================================================
+<===> percent/min/input.scss
+a {b: hsl(0, 0, 0, 0%)}
+
+<===> percent/min/output.css
+a {
+  b: rgba(0, 0, 0, 0);
+}
+
+<===>
+================================================================================
+<===> percent/positive/input.scss
+a {b: hsl(0, 0, 0, 45.6%)}
+
+<===> percent/positive/output.css
+a {
+  b: rgba(0, 0, 0, 0.456);
+}
+
+<===>
+================================================================================
+<===> percent/max/input.scss
+a {b: hsl(0, 0, 0, 100%)}
+
+<===> percent/max/output.css
+a {
+  b: black;
+}
+
+<===>
+================================================================================
+<===> percent/above_max/input.scss
+a {b: hsl(0, 0, 0, 250%)}
+
+<===> percent/above_max/output.css
+a {
+  b: black;
+}
+
+<===>
+================================================================================
+<===> unitless/negative/input.scss
+a {b: hsl(0, 0, 0, -10)}
+
+<===> unitless/negative/output.css
+a {
+  b: rgba(0, 0, 0, 0);
+}
+
+<===>
+================================================================================
+<===> unitless/min/input.scss
+a {b: hsl(0, 0, 0, 0)}
+
+<===> unitless/min/output.css
+a {
+  b: rgba(0, 0, 0, 0);
+}
+
+<===>
+================================================================================
+<===> unitless/positive/input.scss
+a {b: hsl(0, 0, 0, 0.456)}
+
+<===> unitless/positive/output.css
+a {
+  b: rgba(0, 0, 0, 0.456);
+}
+
+<===>
+================================================================================
+<===> unitless/max/input.scss
+a {b: hsl(0, 0, 0, 1)}
+
+<===> unitless/max/output.css
+a {
+  b: black;
+}
+
+<===>
+================================================================================
+<===> unitless/above_max/input.scss
+a {b: hsl(0, 0, 0, 250)}
+
+<===> unitless/above_max/output.css
+a {
+  b: black;
+}
diff --git a/spec/core_functions/color/hsl/four_args/alpha_percent.hrx b/spec/core_functions/color/hsl/four_args/alpha_percent.hrx
deleted file mode 100644
index 53a66831fa..0000000000
--- a/spec/core_functions/color/hsl/four_args/alpha_percent.hrx
+++ /dev/null
@@ -1,17 +0,0 @@
-<===> input.scss
-.alpha-percent {
-  negative: hsl(0, 0, 0, -10%);
-  min: hsl(0, 0, 0, 0%);
-  positive: hsl(0, 0, 0, 45.6%);
-  max: hsl(0, 0, 0, 100%);
-  above-max: hsl(0, 0, 0, 250%);
-}
-
-<===> output.css
-.alpha-percent {
-  negative: rgba(0, 0, 0, 0);
-  min: rgba(0, 0, 0, 0);
-  positive: rgba(0, 0, 0, 0.456);
-  max: black;
-  above-max: black;
-}
diff --git a/spec/core_functions/color/hsl/four_args/alpha_unitless.hrx b/spec/core_functions/color/hsl/four_args/alpha_unitless.hrx
deleted file mode 100644
index 4697a387fe..0000000000
--- a/spec/core_functions/color/hsl/four_args/alpha_unitless.hrx
+++ /dev/null
@@ -1,17 +0,0 @@
-<===> input.scss
-.alpha-unitless {
-  negative: hsl(0, 0, 0, -10);
-  min: hsl(0, 0, 0, 0);
-  positive: hsl(0, 0, 0, 0.456);
-  max: hsl(0, 0, 0, 1);
-  above-max: hsl(0, 0, 0, 250);
-}
-
-<===> output.css
-.alpha-unitless {
-  negative: rgba(0, 0, 0, 0);
-  min: rgba(0, 0, 0, 0);
-  positive: rgba(0, 0, 0, 0.456);
-  max: black;
-  above-max: black;
-}
diff --git a/spec/core_functions/color/hsl/four_args/basic.hrx b/spec/core_functions/color/hsl/four_args/basic.hrx
deleted file mode 100644
index 6954b4d7be..0000000000
--- a/spec/core_functions/color/hsl/four_args/basic.hrx
+++ /dev/null
@@ -1,30 +0,0 @@
-<===> input.scss
-basic {
-  transparent: hsl(180, 60%, 50%, 0);
-  opaque: hsl(180, 60%, 50%, 1);
-  partial: hsl(180, 60%, 50%, 0.5);
-  named: hsl($hue: 180, $saturation: 60%, $lightness: 50%, $alpha: 0.4);
-}
-
-// Channels that are out of bounds are clamped within bounds.
-clamped {
-  saturation: hsl(0, -0.1%, 50%, 0.5);
-  blue: hsl(0, 100%, 9999%, 0.5);
-  alpha-above: hsl(0, 100%, 50%, 1.1);
-  alpha-below: rgba(0, 100%, 50%, -0.1);
-}
-
-<===> output.css
-basic {
-  transparent: rgba(51, 204, 204, 0);
-  opaque: #33cccc;
-  partial: rgba(51, 204, 204, 0.5);
-  named: rgba(51, 204, 204, 0.4);
-}
-
-clamped {
-  saturation: rgba(128, 128, 128, 0.5);
-  blue: rgba(255, 255, 255, 0.5);
-  alpha-above: red;
-  alpha-below: rgba(0, 255, 128, 0);
-}
diff --git a/spec/core_functions/color/hsl/four_args/clamped.hrx b/spec/core_functions/color/hsl/four_args/clamped.hrx
new file mode 100644
index 0000000000..81ce759ab0
--- /dev/null
+++ b/spec/core_functions/color/hsl/four_args/clamped.hrx
@@ -0,0 +1,43 @@
+<===> README.md
+Channels that are out of bounds are clamped within bounds.
+
+<===>
+================================================================================
+<===> saturation/input.scss
+a {b: hsl(0, -0.1%, 50%, 0.5)}
+
+<===> saturation/output.css
+a {
+  b: rgba(128, 128, 128, 0.5);
+}
+
+<===>
+================================================================================
+<===> blue/input.scss
+a {b: hsl(0, 100%, 9999%, 0.5)}
+
+<===> blue/output.css
+a {
+  b: rgba(255, 255, 255, 0.5);
+}
+
+<===>
+================================================================================
+<===> alpha/above/input.scss
+a {b: hsl(0, 100%, 50%, 1.1)}
+
+<===> alpha/above/output.css
+a {
+  b: red;
+}
+
+<===>
+================================================================================
+<===> alpha/below/input.scss
+a {b: rgba(0, 100%, 50%, -0.1)}
+
+<===> alpha/below/output.css
+a {
+  b: rgba(0, 255, 128, 0);
+}
+
diff --git a/spec/core_functions/color/hsl/four_args/in_gamut.hrx b/spec/core_functions/color/hsl/four_args/in_gamut.hrx
new file mode 100644
index 0000000000..f5f4e86585
--- /dev/null
+++ b/spec/core_functions/color/hsl/four_args/in_gamut.hrx
@@ -0,0 +1,37 @@
+<===> transparent/input.scss
+a {b: hsl(180, 60%, 50%, 0)}
+
+<===> transparent/output.css
+a {
+  b: rgba(51, 204, 204, 0);
+}
+
+<===>
+================================================================================
+<===> opaque/input.scss
+a {b: hsl(180, 60%, 50%, 1)}
+
+<===> opaque/output.css
+a {
+  b: #33cccc;
+}
+
+<===>
+================================================================================
+<===> partial/input.scss
+a {b: hsl(180, 60%, 50%, 0.5)}
+
+<===> partial/output.css
+a {
+  b: rgba(51, 204, 204, 0.5);
+}
+
+<===>
+================================================================================
+<===> named/input.scss
+a {b: hsl($hue: 180, $saturation: 60%, $lightness: 50%, $alpha: 0.4)}
+
+<===> named/output.css
+a {
+  b: rgba(51, 204, 204, 0.4);
+}
diff --git a/spec/core_functions/color/hsl/four_args/options.yml b/spec/core_functions/color/hsl/four_args/options.yml
index 076f9d2d59..018b0da451 100644
--- a/spec/core_functions/color/hsl/four_args/options.yml
+++ b/spec/core_functions/color/hsl/four_args/options.yml
@@ -1,3 +1,3 @@
 ---
 :todo:
-- libsass # sass/libsass#2722
+- sass/libsass#2722
diff --git a/spec/core_functions/color/hsl/four_args/special_functions.hrx b/spec/core_functions/color/hsl/four_args/special_functions.hrx
index 4f7986a217..581e735d0d 100644
--- a/spec/core_functions/color/hsl/four_args/special_functions.hrx
+++ b/spec/core_functions/color/hsl/four_args/special_functions.hrx
@@ -1,57 +1,206 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2726
+- sass/libsass#2726
 :ignore_for:
 
-<===> input.scss
-a {
-  calc-1: hsl(calc(1), 2%, 3%, 0.4);
-  calc-2: hsl(1, calc(2%), 3%, 0.4);
-  calc-3: hsl(1, 2%, calc(3%), 0.4);
-  calc-4: hsl(1, 2%, 3%, calc(0.4));
-
-  var-1: hsl(var(--foo), 2%, 3%, 0.4);
-  var-2: hsl(1, var(--foo), 3%, 0.4);
-  var-3: hsl(1, 2%, var(--foo), 0.4);
-  var-4: hsl(1, 2%, 3%, var(--foo));
-
-  env-1: hsl(env(--foo), 2%, 3%, 0.4);
-  env-2: hsl(1, env(--foo), 3%, 0.4);
-  env-3: hsl(1, 2%, env(--foo), 0.4);
-  env-4: hsl(1, 2%, 3%, env(--foo));
-
-  min-1: hsl(min(1), 2%, 3%, 0.4);
-  min-2: hsl(1, min(2%), 3%, 0.4);
-  min-3: hsl(1, 2%, min(3%), 0.4);
-  min-4: hsl(1, 2%, 3%, min(0.4));
-
-  max-1: hsl(max(1), 2%, 3%, 0.4);
-  max-2: hsl(1, max(2%), 3%, 0.4);
-  max-3: hsl(1, 2%, max(3%), 0.4);
-  max-4: hsl(1, 2%, 3%, max(0.4));
-}
-
-<===> output.css
-a {
-  calc-1: hsl(calc(1), 2%, 3%, 0.4);
-  calc-2: hsl(1, calc(2%), 3%, 0.4);
-  calc-3: hsl(1, 2%, calc(3%), 0.4);
-  calc-4: hsl(1, 2%, 3%, calc(0.4));
-  var-1: hsl(var(--foo), 2%, 3%, 0.4);
-  var-2: hsl(1, var(--foo), 3%, 0.4);
-  var-3: hsl(1, 2%, var(--foo), 0.4);
-  var-4: hsl(1, 2%, 3%, var(--foo));
-  env-1: hsl(env(--foo), 2%, 3%, 0.4);
-  env-2: hsl(1, env(--foo), 3%, 0.4);
-  env-3: hsl(1, 2%, env(--foo), 0.4);
-  env-4: hsl(1, 2%, 3%, env(--foo));
-  min-1: hsl(min(1), 2%, 3%, 0.4);
-  min-2: hsl(1, min(2%), 3%, 0.4);
-  min-3: hsl(1, 2%, min(3%), 0.4);
-  min-4: hsl(1, 2%, 3%, min(0.4));
-  max-1: hsl(max(1), 2%, 3%, 0.4);
-  max-2: hsl(1, max(2%), 3%, 0.4);
-  max-3: hsl(1, 2%, max(3%), 0.4);
-  max-4: hsl(1, 2%, 3%, max(0.4));
+<===>
+================================================================================
+<===> calc/arg_1/input.scss
+a {b: hsl(calc(1), 2%, 3%, 0.4)}
+
+<===> calc/arg_1/output.css
+a {
+  b: hsl(calc(1), 2%, 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> calc/arg_2/input.scss
+a {b: hsl(1, calc(2%), 3%, 0.4)}
+
+<===> calc/arg_2/output.css
+a {
+  b: hsl(1, calc(2%), 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> calc/arg_3/input.scss
+a {b: hsl(1, 2%, calc(3%), 0.4)}
+
+<===> calc/arg_3/output.css
+a {
+  b: hsl(1, 2%, calc(3%), 0.4);
+}
+
+<===>
+================================================================================
+<===> calc/arg_4/input.scss
+a {b: hsl(1, 2%, 3%, calc(0.4))}
+
+<===> calc/arg_4/output.css
+a {
+  b: hsl(1, 2%, 3%, calc(0.4));
+}
+
+<===>
+================================================================================
+<===> var/arg_1/input.scss
+a {b: hsl(var(--foo), 2%, 3%, 0.4)}
+
+<===> var/arg_1/output.css
+a {
+  b: hsl(var(--foo), 2%, 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> var/arg_2/input.scss
+a {b: hsl(1, var(--foo), 3%, 0.4)}
+
+<===> var/arg_2/output.css
+a {
+  b: hsl(1, var(--foo), 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> var/arg_3/input.scss
+a {b: hsl(1, 2%, var(--foo), 0.4)}
+
+<===> var/arg_3/output.css
+a {
+  b: hsl(1, 2%, var(--foo), 0.4);
+}
+
+<===>
+================================================================================
+<===> var/arg_4/input.scss
+a {b: hsl(1, 2%, 3%, var(--foo))}
+
+<===> var/arg_4/output.css
+a {
+  b: hsl(1, 2%, 3%, var(--foo));
 }
+
+<===>
+================================================================================
+<===> env/arg_1/input.scss
+a {b: hsl(env(--foo), 2%, 3%, 0.4)}
+
+<===> env/arg_1/output.css
+a {
+  b: hsl(env(--foo), 2%, 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> env/arg_2/input.scss
+a {b: hsl(1, env(--foo), 3%, 0.4)}
+
+<===> env/arg_2/output.css
+a {
+  b: hsl(1, env(--foo), 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> env/arg_3/input.scss
+a {b: hsl(1, 2%, env(--foo), 0.4)}
+
+<===> env/arg_3/output.css
+a {
+  b: hsl(1, 2%, env(--foo), 0.4);
+}
+
+<===>
+================================================================================
+<===> env/arg_4/input.scss
+a {b: hsl(1, 2%, 3%, env(--foo))}
+
+<===> env/arg_4/output.css
+a {
+  b: hsl(1, 2%, 3%, env(--foo));
+}
+
+<===>
+================================================================================
+<===> min/arg_1/input.scss
+a {b: hsl(min(1), 2%, 3%, 0.4)}
+
+<===> min/arg_1/output.css
+a {
+  b: hsl(min(1), 2%, 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> min/arg_2/input.scss
+a {b: hsl(1, min(2%), 3%, 0.4)}
+
+<===> min/arg_2/output.css
+a {
+  b: hsl(1, min(2%), 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> min/arg_3/input.scss
+a {b: hsl(1, 2%, min(3%), 0.4)}
+
+<===> min/arg_3/output.css
+a {
+  b: hsl(1, 2%, min(3%), 0.4);
+}
+
+<===>
+================================================================================
+<===> min/arg_4/input.scss
+a {b: hsl(1, 2%, 3%, min(0.4))}
+
+<===> min/arg_4/output.css
+a {
+  b: hsl(1, 2%, 3%, min(0.4));
+}
+
+<===>
+================================================================================
+<===> max/arg_1/input.scss
+a {b: hsl(max(1), 2%, 3%, 0.4)}
+
+<===> max/arg_1/output.css
+a {
+  b: hsl(max(1), 2%, 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> max/arg_2/input.scss
+a {b: hsl(1, max(2%), 3%, 0.4)}
+
+<===> max/arg_2/output.css
+a {
+  b: hsl(1, max(2%), 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> max/arg_3/input.scss
+a {b: hsl(1, 2%, max(3%), 0.4)}
+
+<===> max/arg_3/output.css
+a {
+  b: hsl(1, 2%, max(3%), 0.4);
+}
+
+<===>
+================================================================================
+<===> max/arg_4/input.scss
+a {b: hsl(1, 2%, 3%, max(0.4))}
+
+<===> max/arg_4/output.css
+a {
+  b: hsl(1, 2%, 3%, max(0.4));
+}
+
diff --git a/spec/core_functions/color/hsl/multi_argument_var.hrx b/spec/core_functions/color/hsl/multi_argument_var.hrx
index 06d7d74e8b..794c084f05 100644
--- a/spec/core_functions/color/hsl/multi_argument_var.hrx
+++ b/spec/core_functions/color/hsl/multi_argument_var.hrx
@@ -3,23 +3,63 @@
 :todo:
 - libsass
 
-<===> input.scss
+<===>
+================================================================================
+<===> 1_of_3/input.scss
+// var() is substituted before parsing, so it may contain multiple arguments.
+a {b: hsl(var(--foo), 3%, 0.4)}
+
+<===> 1_of_3/output.css
 a {
-  // var() is substituted before parsing, so it may contain multiple arguments.
   b: hsl(var(--foo), 3%, 0.4);
-  b: hsl(1, var(--foo), 0.4);
-  b: hsl(1, 2%, var(--foo));
-  b: hsl(var(--foo), 0.4);
-  b: hsl(1, var(--foo));
-  b: hsl(var(--foo));
 }
 
-<===> output.css
+<===>
+================================================================================
+<===> 2_of_3/input.scss
+a {b: hsl(1, var(--foo), 0.4)}
+
+<===> 2_of_3/output.css
 a {
-  b: hsl(var(--foo), 3%, 0.4);
   b: hsl(1, var(--foo), 0.4);
+}
+
+<===>
+================================================================================
+<===> 3_of_3/input.scss
+a {b: hsl(1, 2%, var(--foo))}
+
+<===> 3_of_3/output.css
+a {
   b: hsl(1, 2%, var(--foo));
+}
+
+<===>
+================================================================================
+<===> 1_of_2/input.scss
+a {b: hsl(var(--foo), 0.4)}
+
+<===> 1_of_2/output.css
+a {
   b: hsl(var(--foo), 0.4);
+}
+
+<===>
+================================================================================
+<===> 2_of_2/input.scss
+a {b: hsl(1, var(--foo))}
+
+<===> 2_of_2/output.css
+a {
   b: hsl(1, var(--foo));
+}
+
+<===>
+================================================================================
+<===> 1_of_1/input.scss
+a {b: hsl(var(--foo))}
+
+<===> 1_of_1/output.css
+a {
   b: hsl(var(--foo));
 }
diff --git a/spec/core_functions/color/hsl/one_arg/alpha.hrx b/spec/core_functions/color/hsl/one_arg/alpha.hrx
index 9a77b93fa6..f477e41eea 100644
--- a/spec/core_functions/color/hsl/one_arg/alpha.hrx
+++ b/spec/core_functions/color/hsl/one_arg/alpha.hrx
@@ -1,33 +1,89 @@
-<===> input.scss
-basic {
-  transparent: hsl(180 60% 50% / 0);
-  opaque: hsl(180 60% 50% / 1);
-  partial: hsl(180 60% 50% / 0.5);
-  named: hsl($channels: 180 60% 50% / 0.4);
+<===> in_gamut/transparent/input.scss
+a {b: hsl(180 60% 50% / 0)}
 
-  // Extra parens shouldn't cause the slash to be forced into division.
-  parenthesized: (hsl(180 60% 50% / 0.4));
+<===> in_gamut/transparent/output.css
+a {
+  b: rgba(51, 204, 204, 0);
 }
 
-clamped {
-  saturation: hsl(0 -0.1% 50% / 0.5);
-  lightness: hsl(0 100% 9999% / 0.5);
-  alpha-above: hsl(0 100% 50% / 1.1);
-  alpha-below: hsl(0 100% 50% / -0.1);
+<===>
+================================================================================
+<===> in_gamut/opaque/input.scss
+a {b: hsl(180 60% 50% / 1)}
+
+<===> in_gamut/opaque/output.css
+a {
+  b: #33cccc;
+}
+
+<===>
+================================================================================
+<===> in_gamut/partial/input.scss
+a {b: hsl(180 60% 50% / 0.5)}
+
+<===> in_gamut/partial/output.css
+a {
+  b: rgba(51, 204, 204, 0.5);
+}
+
+<===>
+================================================================================
+<===> in_gamut/named/input.scss
+a {b: hsl($channels: 180 60% 50% / 0.4)}
+
+<===> in_gamut/named/output.css
+a {
+  b: rgba(51, 204, 204, 0.4);
 }
 
-<===> output.css
-basic {
-  transparent: rgba(51, 204, 204, 0);
-  opaque: #33cccc;
-  partial: rgba(51, 204, 204, 0.5);
-  named: rgba(51, 204, 204, 0.4);
-  parenthesized: rgba(51, 204, 204, 0.4);
+<===>
+================================================================================
+<===> in_gamut/parenthesized/input.scss
+// Extra parens shouldn't cause the slash to be forced into division.
+a {b: (hsl(180 60% 50% / 0.4))}
+
+<===> in_gamut/parenthesized/output.css
+a {
+  b: rgba(51, 204, 204, 0.4);
 }
 
-clamped {
-  saturation: rgba(128, 128, 128, 0.5);
-  lightness: rgba(255, 255, 255, 0.5);
-  alpha-above: red;
-  alpha-below: rgba(255, 0, 0, 0);
+<===>
+================================================================================
+<===> clamped/saturation/input.scss
+a {b: hsl(0 -0.1% 50% / 0.5)}
+
+<===> clamped/saturation/output.css
+a {
+  b: rgba(128, 128, 128, 0.5);
 }
+
+<===>
+================================================================================
+<===> clamped/lightness/input.scss
+a {b: hsl(0 100% 9999% / 0.5)}
+
+<===> clamped/lightness/output.css
+a {
+  b: rgba(255, 255, 255, 0.5);
+}
+
+<===>
+================================================================================
+<===> clamped/alpha/above/input.scss
+a {b: hsl(0 100% 50% / 1.1)}
+
+<===> clamped/alpha/above/output.css
+a {
+  b: red;
+}
+
+<===>
+================================================================================
+<===> clamped/alpha/below/input.scss
+a {b: hsl(0 100% 50% / -0.1)}
+
+<===> clamped/alpha/below/output.css
+a {
+  b: rgba(255, 0, 0, 0);
+}
+
diff --git a/spec/core_functions/color/hsl/one_arg/basic.hrx b/spec/core_functions/color/hsl/one_arg/basic.hrx
deleted file mode 100644
index 8397aecf78..0000000000
--- a/spec/core_functions/color/hsl/one_arg/basic.hrx
+++ /dev/null
@@ -1,48 +0,0 @@
-<===> input.scss
-basic {
-  red: hsl(0 100% 50%);
-  blue: hsl(240 100% 50%);
-  grayish-yellow: hsl(60 60% 50%);
-}
-
-clamped {
-  saturation-above: hsl(0 500% 50%);
-  saturation-below: hsl(0 -100% 50%);
-  lightness-above: hsl(0 100% 500%);
-  lightness-below: hsl(0 100% -100%);
-}
-
-units {
-  hue-deg: hsl(0deg 100% 50%);
-  saturation-unitless: hsl(0 50 50%);
-  lightness-unitless: hsl(0 100% 50);
-}
-
-named {
-  x: hsl($channels: 0 100% 50%);
-}
-
-<===> output.css
-basic {
-  red: red;
-  blue: blue;
-  grayish-yellow: #cccc33;
-}
-
-
-clamped {
-  saturation-above: red;
-  saturation-below: gray;
-  lightness-above: white;
-  lightness-below: black;
-}
-
-units {
-  hue-deg: red;
-  saturation-unitless: #bf4040;
-  lightness-unitless: red;
-}
-
-named {
-  x: red;
-}
diff --git a/spec/core_functions/color/hsl/one_arg/no_alpha.hrx b/spec/core_functions/color/hsl/one_arg/no_alpha.hrx
new file mode 100644
index 0000000000..2eb1d44c65
--- /dev/null
+++ b/spec/core_functions/color/hsl/one_arg/no_alpha.hrx
@@ -0,0 +1,108 @@
+<===> in_gamut/red/input.scss
+a {b: hsl(0 100% 50%)}
+
+<===> in_gamut/red/output.css
+a {
+  b: red;
+}
+
+<===>
+================================================================================
+<===> in_gamut/blue/input.scss
+a {b: hsl(240 100% 50%)}
+
+<===> in_gamut/blue/output.css
+a {
+  b: blue;
+}
+
+<===>
+================================================================================
+<===> in_gamut/grayish/yellow/input.scss
+a {b: hsl(60 60% 50%)}
+
+<===> in_gamut/grayish/yellow/output.css
+a {
+  b: #cccc33;
+}
+
+<===>
+================================================================================
+<===> clamped/saturation/above/input.scss
+a {b: hsl(0 500% 50%)}
+
+<===> clamped/saturation/above/output.css
+a {
+  b: red;
+}
+
+<===>
+================================================================================
+<===> clamped/saturation/below/input.scss
+a {b: hsl(0 -100% 50%)}
+
+<===> clamped/saturation/below/output.css
+a {
+  b: gray;
+}
+
+<===>
+================================================================================
+<===> clamped/lightness/above/input.scss
+a {b: hsl(0 100% 500%)}
+
+<===> clamped/lightness/above/output.css
+a {
+  b: white;
+}
+
+<===>
+================================================================================
+<===> clamped/lightness/below/input.scss
+a {b: hsl(0 100% -100%)}
+
+<===> clamped/lightness/below/output.css
+a {
+  b: black;
+}
+
+<===>
+================================================================================
+<===> units/hue/deg/input.scss
+a {b: hsl(0deg 100% 50%)}
+
+<===> units/hue/deg/output.css
+a {
+  b: red;
+}
+
+<===>
+================================================================================
+<===> units/saturation/unitless/input.scss
+a {b: hsl(0 50 50%)}
+
+<===> units/saturation/unitless/output.css
+a {
+  b: #bf4040;
+}
+
+<===>
+================================================================================
+<===> units/lightness/unitless/input.scss
+a {b: hsl(0 100% 50)}
+
+<===> units/lightness/unitless/output.css
+a {
+  b: red;
+}
+
+<===>
+================================================================================
+<===> named/input.scss
+a {b: hsl($channels: 0 100% 50%)}
+
+<===> named/output.css
+a {
+  b: red;
+}
+
diff --git a/spec/core_functions/color/hsl/one_arg/options.yml b/spec/core_functions/color/hsl/one_arg/options.yml
index 076f9d2d59..018b0da451 100644
--- a/spec/core_functions/color/hsl/one_arg/options.yml
+++ b/spec/core_functions/color/hsl/one_arg/options.yml
@@ -1,3 +1,3 @@
 ---
 :todo:
-- libsass # sass/libsass#2722
+- sass/libsass#2722
diff --git a/spec/core_functions/color/hsl/one_arg/special_functions.hrx b/spec/core_functions/color/hsl/one_arg/special_functions.hrx
index 5d26754578..c7925ad95b 100644
--- a/spec/core_functions/color/hsl/one_arg/special_functions.hrx
+++ b/spec/core_functions/color/hsl/one_arg/special_functions.hrx
@@ -1,113 +1,417 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2726
+- sass/libsass#2726
 :ignore_for:
 
-<===> input.scss
-no-alpha {
-  calc-1: hsl(calc(1) 2% 3%);
-  calc-2: hsl(1 calc(2%) 3%);
-  calc-3: hsl(1 2% calc(3%));
-
-  var-1: hsl(var(--foo) 2% 3%);
-  var-2: hsl(1 var(--foo) 3%);
-  var-3: hsl(1 2% var(--foo));
-
-  env-1: hsl(env(--foo) 2% 3%);
-  env-2: hsl(1 env(--foo) 3%);
-  env-3: hsl(1 2% env(--foo));
-
-  min-1: hsl(min(1) 2% 3%);
-  min-2: hsl(1 min(2%) 3%);
-  min-3: hsl(1 2% min(3%));
-
-  max-1: hsl(max(1) 2% 3%);
-  max-2: hsl(1 max(2%) 3%);
-  max-3: hsl(1 2% max(3%));
-
-  // var() is substituted before parsing, so it may contain multiple arguments.
-  multi-argument-var-1-of-2: hsl(var(--foo) 50%);
-  multi-argument-var-2-of-2: hsl(0 var(--foo));
-  multi-argument-var-1-of-1: hsl(var(--foo));
-}
-
-alpha {
-  calc-1: hsl(calc(1) 2% 3% / 0.4);
-  calc-2: hsl(1 calc(2%) 3% / 0.4);
-  calc-3: hsl(1 2% calc(3%) / 0.4);
-  calc-4: hsl(1 2% 3% / calc(0.4));
-
-  var-1: hsl(var(--foo) 2% 3% / 0.4);
-  var-2: hsl(1 var(--foo) 3% / 0.4);
-  var-3: hsl(1 2% var(--foo) / 0.4);
-  var-4: hsl(1 2% 3% / var(--foo));
-
-  env-1: hsl(env(--foo) 2% 3% / 0.4);
-  env-2: hsl(1 env(--foo) 3% / 0.4);
-  env-3: hsl(1 2% env(--foo) / 0.4);
-  env-4: hsl(1 2% 3% / env(--foo));
-
-  min-1: hsl(min(1) 2% 3% / 0.4);
-  min-2: hsl(1 min(2%) 3% / 0.4);
-  min-3: hsl(1 2% min(3%) / 0.4);
-  min-4: hsl(1 2% 3% / min(0.4));
-
-  max-1: hsl(max(1) 2% 3% / 0.4);
-  max-2: hsl(1 max(2%) 3% / 0.4);
-  max-3: hsl(1 2% max(3%) / 0.4);
-  max-4: hsl(1 2% 3% / max(0.4));
-
-  // var() is substituted before parsing, so it may contain multiple arguments.
-  multi-argument-var-1-of-2: hsl(var(--foo) 50% / 0.4);
-  multi-argument-var-2-of-2: hsl(0 var(--foo) / 0.4);
-  multi-argument-var-1-of-1: hsl(var(--foo) / 0.4);
-}
-
-<===> output.css
-no-alpha {
-  calc-1: hsl(calc(1), 2%, 3%);
-  calc-2: hsl(1, calc(2%), 3%);
-  calc-3: hsl(1, 2%, calc(3%));
-  var-1: hsl(var(--foo), 2%, 3%);
-  var-2: hsl(1, var(--foo), 3%);
-  var-3: hsl(1, 2%, var(--foo));
-  env-1: hsl(env(--foo), 2%, 3%);
-  env-2: hsl(1, env(--foo), 3%);
-  env-3: hsl(1, 2%, env(--foo));
-  min-1: hsl(min(1), 2%, 3%);
-  min-2: hsl(1, min(2%), 3%);
-  min-3: hsl(1, 2%, min(3%));
-  max-1: hsl(max(1), 2%, 3%);
-  max-2: hsl(1, max(2%), 3%);
-  max-3: hsl(1, 2%, max(3%));
-  multi-argument-var-1-of-2: hsl(var(--foo) 50%);
-  multi-argument-var-2-of-2: hsl(0 var(--foo));
-  multi-argument-var-1-of-1: hsl(var(--foo));
-}
-
-alpha {
-  calc-1: hsl(calc(1), 2%, 3%, 0.4);
-  calc-2: hsl(1, calc(2%), 3%, 0.4);
-  calc-3: hsl(1 2% calc(3%)/0.4);
-  calc-4: hsl(1 2% 3%/calc(0.4));
-  var-1: hsl(var(--foo), 2%, 3%, 0.4);
-  var-2: hsl(1, var(--foo), 3%, 0.4);
-  var-3: hsl(1 2% var(--foo)/0.4);
-  var-4: hsl(1 2% 3%/var(--foo));
-  env-1: hsl(env(--foo), 2%, 3%, 0.4);
-  env-2: hsl(1, env(--foo), 3%, 0.4);
-  env-3: hsl(1 2% env(--foo)/0.4);
-  env-4: hsl(1 2% 3%/env(--foo));
-  min-1: hsl(min(1), 2%, 3%, 0.4);
-  min-2: hsl(1, min(2%), 3%, 0.4);
-  min-3: hsl(1 2% min(3%)/0.4);
-  min-4: hsl(1 2% 3%/min(0.4));
-  max-1: hsl(max(1), 2%, 3%, 0.4);
-  max-2: hsl(1, max(2%), 3%, 0.4);
-  max-3: hsl(1 2% max(3%)/0.4);
-  max-4: hsl(1 2% 3%/max(0.4));
-  multi-argument-var-1-of-2: hsl(var(--foo) 50%/0.4);
-  multi-argument-var-2-of-2: hsl(0 var(--foo)/0.4);
-  multi-argument-var-1-of-1: hsl(var(--foo)/0.4);
+<===>
+================================================================================
+<===> no_alpha/calc/arg_1/input.scss
+a {b: hsl(calc(1) 2% 3%)}
+
+<===> no_alpha/calc/arg_1/output.css
+a {
+  b: hsl(calc(1), 2%, 3%);
+}
+
+<===>
+================================================================================
+<===> no_alpha/calc/arg_2/input.scss
+a {b: hsl(1 calc(2%) 3%)}
+
+<===> no_alpha/calc/arg_2/output.css
+a {
+  b: hsl(1, calc(2%), 3%);
+}
+
+<===>
+================================================================================
+<===> no_alpha/calc/arg_3/input.scss
+a {b: hsl(1 2% calc(3%))}
+
+<===> no_alpha/calc/arg_3/output.css
+a {
+  b: hsl(1, 2%, calc(3%));
+}
+
+<===>
+================================================================================
+<===> no_alpha/var/arg_1/input.scss
+a {b: hsl(var(--foo) 2% 3%)}
+
+<===> no_alpha/var/arg_1/output.css
+a {
+  b: hsl(var(--foo), 2%, 3%);
+}
+
+<===>
+================================================================================
+<===> no_alpha/var/arg_2/input.scss
+a {b: hsl(1 var(--foo) 3%)}
+
+<===> no_alpha/var/arg_2/output.css
+a {
+  b: hsl(1, var(--foo), 3%);
+}
+
+<===>
+================================================================================
+<===> no_alpha/var/arg_3/input.scss
+a {b: hsl(1 2% var(--foo))}
+
+<===> no_alpha/var/arg_3/output.css
+a {
+  b: hsl(1, 2%, var(--foo));
+}
+
+<===>
+================================================================================
+<===> no_alpha/env/arg_1/input.scss
+a {b: hsl(env(--foo) 2% 3%)}
+
+<===> no_alpha/env/arg_1/output.css
+a {
+  b: hsl(env(--foo), 2%, 3%);
+}
+
+<===>
+================================================================================
+<===> no_alpha/env/arg_2/input.scss
+a {b: hsl(1 env(--foo) 3%)}
+
+<===> no_alpha/env/arg_2/output.css
+a {
+  b: hsl(1, env(--foo), 3%);
+}
+
+<===>
+================================================================================
+<===> no_alpha/env/arg_3/input.scss
+a {b: hsl(1 2% env(--foo))}
+
+<===> no_alpha/env/arg_3/output.css
+a {
+  b: hsl(1, 2%, env(--foo));
+}
+
+<===>
+================================================================================
+<===> no_alpha/min/arg_1/input.scss
+a {b: hsl(min(1) 2% 3%)}
+
+<===> no_alpha/min/arg_1/output.css
+a {
+  b: hsl(min(1), 2%, 3%);
+}
+
+<===>
+================================================================================
+<===> no_alpha/min/arg_2/input.scss
+a {b: hsl(1 min(2%) 3%)}
+
+<===> no_alpha/min/arg_2/output.css
+a {
+  b: hsl(1, min(2%), 3%);
+}
+
+<===>
+================================================================================
+<===> no_alpha/min/arg_3/input.scss
+a {b: hsl(1 2% min(3%))}
+
+<===> no_alpha/min/arg_3/output.css
+a {
+  b: hsl(1, 2%, min(3%));
+}
+
+<===>
+================================================================================
+<===> no_alpha/max/arg_1/input.scss
+a {b: hsl(max(1) 2% 3%)}
+
+<===> no_alpha/max/arg_1/output.css
+a {
+  b: hsl(max(1), 2%, 3%);
+}
+
+<===>
+================================================================================
+<===> no_alpha/max/arg_2/input.scss
+a {b: hsl(1 max(2%) 3%)}
+
+<===> no_alpha/max/arg_2/output.css
+a {
+  b: hsl(1, max(2%), 3%);
+}
+
+<===>
+================================================================================
+<===> no_alpha/max/arg_3/input.scss
+a {b: hsl(1 2% max(3%))}
+
+<===> no_alpha/max/arg_3/output.css
+a {
+  b: hsl(1, 2%, max(3%));
+}
+
+<===>
+================================================================================
+<===> no_alpha/multi/argument/var/arg_1/of/arg_2/input.scss
+// var() is substituted before parsing, so it may contain multiple arguments.
+a {b: hsl(var(--foo) 50%)}
+
+<===> no_alpha/multi/argument/var/arg_1/of/arg_2/output.css
+a {
+  b: hsl(var(--foo) 50%);
+}
+
+<===>
+================================================================================
+<===> no_alpha/multi/argument/var/arg_2/of/arg_2/input.scss
+a {b: hsl(0 var(--foo))}
+
+<===> no_alpha/multi/argument/var/arg_2/of/arg_2/output.css
+a {
+  b: hsl(0 var(--foo));
+}
+
+<===>
+================================================================================
+<===> no_alpha/multi/argument/var/arg_1/of/arg_1/input.scss
+a {b: hsl(var(--foo))}
+
+<===> no_alpha/multi/argument/var/arg_1/of/arg_1/output.css
+a {
+  b: hsl(var(--foo));
+}
+
+<===>
+================================================================================
+<===> alpha/calc/arg_1/input.scss
+a {b: hsl(calc(1) 2% 3% / 0.4)}
+
+<===> alpha/calc/arg_1/output.css
+a {
+  b: hsl(calc(1), 2%, 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/calc/arg_2/input.scss
+a {b: hsl(1 calc(2%) 3% / 0.4)}
+
+<===> alpha/calc/arg_2/output.css
+a {
+  b: hsl(1, calc(2%), 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/calc/arg_3/input.scss
+a {b: hsl(1 2% calc(3%) / 0.4)}
+
+<===> alpha/calc/arg_3/output.css
+a {
+  b: hsl(1 2% calc(3%)/0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/calc/arg_4/input.scss
+a {b: hsl(1 2% 3% / calc(0.4))}
+
+<===> alpha/calc/arg_4/output.css
+a {
+  b: hsl(1 2% 3%/calc(0.4));
+}
+
+<===>
+================================================================================
+<===> alpha/var/arg_1/input.scss
+a {b: hsl(var(--foo) 2% 3% / 0.4)}
+
+<===> alpha/var/arg_1/output.css
+a {
+  b: hsl(var(--foo), 2%, 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/var/arg_2/input.scss
+a {b: hsl(1 var(--foo) 3% / 0.4)}
+
+<===> alpha/var/arg_2/output.css
+a {
+  b: hsl(1, var(--foo), 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/var/arg_3/input.scss
+a {b: hsl(1 2% var(--foo) / 0.4)}
+
+<===> alpha/var/arg_3/output.css
+a {
+  b: hsl(1 2% var(--foo)/0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/var/arg_4/input.scss
+a {b: hsl(1 2% 3% / var(--foo))}
+
+<===> alpha/var/arg_4/output.css
+a {
+  b: hsl(1 2% 3%/var(--foo));
+}
+
+<===>
+================================================================================
+<===> alpha/env/arg_1/input.scss
+a {b: hsl(env(--foo) 2% 3% / 0.4)}
+
+<===> alpha/env/arg_1/output.css
+a {
+  b: hsl(env(--foo), 2%, 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/env/arg_2/input.scss
+a {b: hsl(1 env(--foo) 3% / 0.4)}
+
+<===> alpha/env/arg_2/output.css
+a {
+  b: hsl(1, env(--foo), 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/env/arg_3/input.scss
+a {b: hsl(1 2% env(--foo) / 0.4)}
+
+<===> alpha/env/arg_3/output.css
+a {
+  b: hsl(1 2% env(--foo)/0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/env/arg_4/input.scss
+a {b: hsl(1 2% 3% / env(--foo))}
+
+<===> alpha/env/arg_4/output.css
+a {
+  b: hsl(1 2% 3%/env(--foo));
+}
+
+<===>
+================================================================================
+<===> alpha/min/arg_1/input.scss
+a {b: hsl(min(1) 2% 3% / 0.4)}
+
+<===> alpha/min/arg_1/output.css
+a {
+  b: hsl(min(1), 2%, 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/min/arg_2/input.scss
+a {b: hsl(1 min(2%) 3% / 0.4)}
+
+<===> alpha/min/arg_2/output.css
+a {
+  b: hsl(1, min(2%), 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/min/arg_3/input.scss
+a {b: hsl(1 2% min(3%) / 0.4)}
+
+<===> alpha/min/arg_3/output.css
+a {
+  b: hsl(1 2% min(3%)/0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/min/arg_4/input.scss
+a {b: hsl(1 2% 3% / min(0.4))}
+
+<===> alpha/min/arg_4/output.css
+a {
+  b: hsl(1 2% 3%/min(0.4));
+}
+
+<===>
+================================================================================
+<===> alpha/max/arg_1/input.scss
+a {b: hsl(max(1) 2% 3% / 0.4)}
+
+<===> alpha/max/arg_1/output.css
+a {
+  b: hsl(max(1), 2%, 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/max/arg_2/input.scss
+a {b: hsl(1 max(2%) 3% / 0.4)}
+
+<===> alpha/max/arg_2/output.css
+a {
+  b: hsl(1, max(2%), 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/max/arg_3/input.scss
+a {b: hsl(1 2% max(3%) / 0.4)}
+
+<===> alpha/max/arg_3/output.css
+a {
+  b: hsl(1 2% max(3%)/0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/max/arg_4/input.scss
+a {b: hsl(1 2% 3% / max(0.4))}
+
+<===> alpha/max/arg_4/output.css
+a {
+  b: hsl(1 2% 3%/max(0.4));
+}
+
+<===>
+================================================================================
+<===> alpha/multi_argument_var/1_of_2/input.scss
+// var() is substituted before parsing, so it may contain multiple arguments.
+a {b: hsl(var(--foo) 50% / 0.4)}
+
+<===> alpha/multi_argument_var/1_of_2/output.css
+a {
+  b: hsl(var(--foo) 50%/0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/multi_argument_var/2_of_2/input.scss
+a {b: hsl(0 var(--foo) / 0.4)}
+
+<===> alpha/multi_argument_var/2_of_2/output.css
+a {
+  b: hsl(0 var(--foo)/0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/multi_argument_var/1_of_1/input.scss
+a {b: hsl(var(--foo) / 0.4)}
+
+<===> alpha/multi_argument_var/1_of_1/output.css
+a {
+  b: hsl(var(--foo)/0.4);
 }
diff --git a/spec/core_functions/color/hsl/three_args/basic.hrx b/spec/core_functions/color/hsl/three_args/basic.hrx
deleted file mode 100644
index e2bc407ec3..0000000000
--- a/spec/core_functions/color/hsl/three_args/basic.hrx
+++ /dev/null
@@ -1,635 +0,0 @@
-<===> input.scss
-// These test cases come from two official W3C test suites:
-//
-// * https://www.w3.org/Style/CSS/Test/CSS3/Color/20070927/html4/t040204-hsl-h-rotating-b.htm
-// * https://www.w3.org/Style/CSS/Test/CSS3/Color/current/html4/t040204-hsl-values-b.htm
-
-hue {
-  @mixin test-hues($name, $hues...) {
-    #{$name} {
-      @each $hue in $hues {
-        hue-#{$hue}: hsl($hue, 100%, 50%);
-      }
-    }
-  }
-
-  @include test-hues("red", 0, -360, 260, 6120);
-  @include test-hues("yellow", 60, -300, 420, -9660);
-  @include test-hues("green", 120, -240, 480, 99840);
-  @include test-hues("cyan", 180, -180, 540, -900);
-  @include test-hues("blue", 240, -120, 600, -104880);
-  @include test-hues("purple", 300, -60, 660, 2820);
-}
-
-red-to-green {
-  step-1: hsl(0, 100%, 50%);
-  step-2: hsl(12, 100%, 50%);
-  step-3: hsl(24, 100%, 50%);
-  step-4: hsl(36, 100%, 50%);
-  step-5: hsl(48, 100%, 50%);
-  step-6: hsl(60, 100%, 50%);
-  step-7: hsl(72, 100%, 50%);
-  step-8: hsl(84, 100%, 50%);
-  step-9: hsl(96, 100%, 50%);
-  step-10: hsl(108, 100%, 50%);
-  step-11: hsl(120, 100%, 50%);
-}
-
-green-to-blue {
-  step-1: hsl(120, 100%, 50%);
-  step-2: hsl(132, 100%, 50%);
-  step-3: hsl(144, 100%, 50%);
-  step-4: hsl(156, 100%, 50%);
-  step-5: hsl(168, 100%, 50%);
-  step-6: hsl(180, 100%, 50%);
-  step-7: hsl(192, 100%, 50%);
-  step-8: hsl(204, 100%, 50%);
-  step-9: hsl(216, 100%, 50%);
-  step-10: hsl(228, 100%, 50%);
-  step-11: hsl(240, 100%, 50%);
-}
-
-blue-to-red {
-  step-1: hsl(240, 100%, 50%);
-  step-2: hsl(252, 100%, 50%);
-  step-3: hsl(264, 100%, 50%);
-  step-4: hsl(276, 100%, 50%);
-  step-5: hsl(288, 100%, 50%);
-  step-6: hsl(300, 100%, 50%);
-  step-7: hsl(312, 100%, 50%);
-  step-8: hsl(324, 100%, 50%);
-  step-9: hsl(336, 100%, 50%);
-  step-10: hsl(348, 100%, 50%);
-  step-11: hsl(360, 100%, 50%);
-}
-
-gray-to {
-  red {
-    step-1: hsl(0, 20%, 50%);
-    step-2: hsl(0, 60%, 50%);
-    step-3: hsl(0, 100%, 50%);
-  }
-
-  yellow {
-    step-1: hsl(60, 20%, 50%);
-    step-2: hsl(60, 60%, 50%);
-    step-3: hsl(60, 100%, 50%);
-  }
-
-  green {
-    step-1: hsl(120, 20%, 50%);
-    step-2: hsl(120, 60%, 50%);
-    step-3: hsl(120, 100%, 50%);
-  }
-
-  cyan {
-    step-1: hsl(180, 20%, 50%);
-    step-2: hsl(180, 60%, 50%);
-    step-3: hsl(180, 100%, 50%);
-  }
-
-  blue {
-    step-1: hsl(240, 20%, 50%);
-    step-2: hsl(240, 60%, 50%);
-    step-3: hsl(240, 100%, 50%);
-  }
-
-  purple {
-    step-1: hsl(300, 20%, 50%);
-    step-2: hsl(300, 60%, 50%);
-    step-3: hsl(300, 100%, 50%);
-  }
-}
-
-black-to-white-through {
-  red {
-    step-1: hsl(0, 100%, 0%);
-    step-2: hsl(0, 100%, 10%);
-    step-3: hsl(0, 100%, 20%);
-    step-4: hsl(0, 100%, 30%);
-    step-5: hsl(0, 100%, 40%);
-    step-6: hsl(0, 100%, 50%);
-    step-7: hsl(0, 100%, 60%);
-    step-8: hsl(0, 100%, 70%);
-    step-9: hsl(0, 100%, 80%);
-    step-10: hsl(0, 100%, 90%);
-    step-11: hsl(0, 100%, 100%);
-  }
-
-  yellow {
-    step-1: hsl(60, 100%, 0%);
-    step-2: hsl(60, 100%, 10%);
-    step-3: hsl(60, 100%, 20%);
-    step-4: hsl(60, 100%, 30%);
-    step-5: hsl(60, 100%, 40%);
-    step-6: hsl(60, 100%, 50%);
-    step-7: hsl(60, 100%, 60%);
-    step-8: hsl(60, 100%, 70%);
-    step-9: hsl(60, 100%, 80%);
-    step-10: hsl(60, 100%, 90%);
-    step-11: hsl(60, 100%, 100%);
-  }
-
-  green {
-    step-1: hsl(120, 100%, 0%);
-    step-2: hsl(120, 100%, 10%);
-    step-3: hsl(120, 100%, 20%);
-    step-4: hsl(120, 100%, 30%);
-    step-5: hsl(120, 100%, 40%);
-    step-6: hsl(120, 100%, 50%);
-    step-7: hsl(120, 100%, 60%);
-    step-8: hsl(120, 100%, 70%);
-    step-9: hsl(120, 100%, 80%);
-    step-10: hsl(120, 100%, 90%);
-    step-11: hsl(120, 100%, 100%);
-  }
-
-  cyan {
-    step-1: hsl(180, 100%, 0%);
-    step-2: hsl(180, 100%, 10%);
-    step-3: hsl(180, 100%, 20%);
-    step-4: hsl(180, 100%, 30%);
-    step-5: hsl(180, 100%, 40%);
-    step-6: hsl(180, 100%, 50%);
-    step-7: hsl(180, 100%, 60%);
-    step-8: hsl(180, 100%, 70%);
-    step-9: hsl(180, 100%, 80%);
-    step-10: hsl(180, 100%, 90%);
-    step-11: hsl(180, 100%, 100%);
-  }
-
-  blue {
-    step-1: hsl(240, 100%, 0%);
-    step-2: hsl(240, 100%, 10%);
-    step-3: hsl(240, 100%, 20%);
-    step-4: hsl(240, 100%, 30%);
-    step-5: hsl(240, 100%, 40%);
-    step-6: hsl(240, 100%, 50%);
-    step-7: hsl(240, 100%, 60%);
-    step-8: hsl(240, 100%, 70%);
-    step-9: hsl(240, 100%, 80%);
-    step-10: hsl(240, 100%, 90%);
-    step-11: hsl(240, 100%, 100%);
-  }
-
-  purple {
-    step-1: hsl(300, 100%, 0%);
-    step-2: hsl(300, 100%, 10%);
-    step-3: hsl(300, 100%, 20%);
-    step-4: hsl(300, 100%, 30%);
-    step-5: hsl(300, 100%, 40%);
-    step-6: hsl(300, 100%, 50%);
-    step-7: hsl(300, 100%, 60%);
-    step-8: hsl(300, 100%, 70%);
-    step-9: hsl(300, 100%, 80%);
-    step-10: hsl(300, 100%, 90%);
-    step-11: hsl(300, 100%, 100%);
-  }
-}
-
-// The W3C tests cover clamped hue, but not clamped saturation or lightness.
-clamped {
-  saturation-above: hsl(0, 500%, 50%);
-  saturation-below: hsl(0, -100%, 50%);
-  lightness-above: hsl(0, 100%, 500%);
-  lightness-below: hsl(0, 100%, -100%);
-}
-
-units {
-  hue-deg: hsl(0deg, 100%, 50%);
-  saturation-unitless: hsl(0, 50, 50%);
-  lightness-unitless: hsl(0, 100%, 50);
-}
-
-named {
-  x: hsl($hue: 0, $saturation: 100%, $lightness: 50%);
-}
-
-<===> output.css
-hue red {
-  hue-0: red;
-  hue--360: red;
-  hue-260: #5500ff;
-  hue-6120: red;
-}
-hue yellow {
-  hue-60: yellow;
-  hue--300: yellow;
-  hue-420: yellow;
-  hue--9660: yellow;
-}
-hue green {
-  hue-120: lime;
-  hue--240: lime;
-  hue-480: lime;
-  hue-99840: lime;
-}
-hue cyan {
-  hue-180: aqua;
-  hue--180: aqua;
-  hue-540: aqua;
-  hue--900: aqua;
-}
-hue blue {
-  hue-240: blue;
-  hue--120: blue;
-  hue-600: blue;
-  hue--104880: blue;
-}
-hue purple {
-  hue-300: fuchsia;
-  hue--60: fuchsia;
-  hue-660: fuchsia;
-  hue-2820: fuchsia;
-}
-
-red-to-green {
-  step-1: red;
-  step-2: #ff3300;
-  step-3: #ff6600;
-  step-4: #ff9900;
-  step-5: #ffcc00;
-  step-6: yellow;
-  step-7: #ccff00;
-  step-8: #99ff00;
-  step-9: #66ff00;
-  step-10: #33ff00;
-  step-11: lime;
-}
-
-green-to-blue {
-  step-1: lime;
-  step-2: #00ff33;
-  step-3: #00ff66;
-  step-4: #00ff99;
-  step-5: #00ffcc;
-  step-6: aqua;
-  step-7: #00ccff;
-  step-8: #0099ff;
-  step-9: #0066ff;
-  step-10: #0033ff;
-  step-11: blue;
-}
-
-blue-to-red {
-  step-1: blue;
-  step-2: #3300ff;
-  step-3: #6600ff;
-  step-4: #9900ff;
-  step-5: #cc00ff;
-  step-6: fuchsia;
-  step-7: #ff00cc;
-  step-8: #ff0099;
-  step-9: #ff0066;
-  step-10: #ff0033;
-  step-11: red;
-}
-
-gray-to red {
-  step-1: #996666;
-  step-2: #cc3333;
-  step-3: red;
-}
-gray-to yellow {
-  step-1: #999966;
-  step-2: #cccc33;
-  step-3: yellow;
-}
-gray-to green {
-  step-1: #669966;
-  step-2: #33cc33;
-  step-3: lime;
-}
-gray-to cyan {
-  step-1: #669999;
-  step-2: #33cccc;
-  step-3: aqua;
-}
-gray-to blue {
-  step-1: #666699;
-  step-2: #3333cc;
-  step-3: blue;
-}
-gray-to purple {
-  step-1: #996699;
-  step-2: #cc33cc;
-  step-3: fuchsia;
-}
-
-black-to-white-through red {
-  step-1: black;
-  step-2: #330000;
-  step-3: #660000;
-  step-4: #990000;
-  step-5: #cc0000;
-  step-6: red;
-  step-7: #ff3333;
-  step-8: #ff6666;
-  step-9: #ff9999;
-  step-10: #ffcccc;
-  step-11: white;
-}
-black-to-white-through yellow {
-  step-1: black;
-  step-2: #333300;
-  step-3: #666600;
-  step-4: #999900;
-  step-5: #cccc00;
-  step-6: yellow;
-  step-7: #ffff33;
-  step-8: #ffff66;
-  step-9: #ffff99;
-  step-10: #ffffcc;
-  step-11: white;
-}
-black-to-white-through green {
-  step-1: black;
-  step-2: #003300;
-  step-3: #006600;
-  step-4: #009900;
-  step-5: #00cc00;
-  step-6: lime;
-  step-7: #33ff33;
-  step-8: #66ff66;
-  step-9: #99ff99;
-  step-10: #ccffcc;
-  step-11: white;
-}
-black-to-white-through cyan {
-  step-1: black;
-  step-2: #003333;
-  step-3: #006666;
-  step-4: #009999;
-  step-5: #00cccc;
-  step-6: aqua;
-  step-7: #33ffff;
-  step-8: #66ffff;
-  step-9: #99ffff;
-  step-10: #ccffff;
-  step-11: white;
-}
-black-to-white-through blue {
-  step-1: black;
-  step-2: #000033;
-  step-3: #000066;
-  step-4: #000099;
-  step-5: #0000cc;
-  step-6: blue;
-  step-7: #3333ff;
-  step-8: #6666ff;
-  step-9: #9999ff;
-  step-10: #ccccff;
-  step-11: white;
-}
-black-to-white-through purple {
-  step-1: black;
-  step-2: #330033;
-  step-3: #660066;
-  step-4: #990099;
-  step-5: #cc00cc;
-  step-6: fuchsia;
-  step-7: #ff33ff;
-  step-8: #ff66ff;
-  step-9: #ff99ff;
-  step-10: #ffccff;
-  step-11: white;
-}
-
-clamped {
-  saturation-above: red;
-  saturation-below: gray;
-  lightness-above: white;
-  lightness-below: black;
-}
-
-units {
-  hue-deg: red;
-  saturation-unitless: #bf4040;
-  lightness-unitless: red;
-}
-
-named {
-  x: red;
-}
-
-<===> output-libsass.css
-hue red {
-  hue-0: red;
-  hue--360: red;
-  hue-260: #5500ff;
-  hue-6120: red;
-}
-
-hue yellow {
-  hue-60: yellow;
-  hue--300: yellow;
-  hue-420: yellow;
-  hue--9660: yellow;
-}
-
-hue green {
-  hue-120: lime;
-  hue--240: lime;
-  hue-480: lime;
-  hue-99840: lime;
-}
-
-hue cyan {
-  hue-180: cyan;
-  hue--180: cyan;
-  hue-540: cyan;
-  hue--900: cyan;
-}
-
-hue blue {
-  hue-240: blue;
-  hue--120: blue;
-  hue-600: blue;
-  hue--104880: blue;
-}
-
-hue purple {
-  hue-300: magenta;
-  hue--60: magenta;
-  hue-660: magenta;
-  hue-2820: magenta;
-}
-
-red-to-green {
-  step-1: red;
-  step-2: #ff3300;
-  step-3: #ff6600;
-  step-4: #ff9900;
-  step-5: #ffcc00;
-  step-6: yellow;
-  step-7: #ccff00;
-  step-8: #99ff00;
-  step-9: #66ff00;
-  step-10: #33ff00;
-  step-11: lime;
-}
-
-green-to-blue {
-  step-1: lime;
-  step-2: #00ff33;
-  step-3: #00ff66;
-  step-4: #00ff99;
-  step-5: #00ffcc;
-  step-6: cyan;
-  step-7: #00ccff;
-  step-8: #0099ff;
-  step-9: #0066ff;
-  step-10: #0033ff;
-  step-11: blue;
-}
-
-blue-to-red {
-  step-1: blue;
-  step-2: #3300ff;
-  step-3: #6600ff;
-  step-4: #9900ff;
-  step-5: #cc00ff;
-  step-6: magenta;
-  step-7: #ff00cc;
-  step-8: #ff0099;
-  step-9: #ff0066;
-  step-10: #ff0033;
-  step-11: red;
-}
-
-gray-to red {
-  step-1: #996666;
-  step-2: #cc3333;
-  step-3: red;
-}
-
-gray-to yellow {
-  step-1: #999966;
-  step-2: #cccc33;
-  step-3: yellow;
-}
-
-gray-to green {
-  step-1: #669966;
-  step-2: #33cc33;
-  step-3: lime;
-}
-
-gray-to cyan {
-  step-1: #669999;
-  step-2: #33cccc;
-  step-3: cyan;
-}
-
-gray-to blue {
-  step-1: #666699;
-  step-2: #3333cc;
-  step-3: blue;
-}
-
-gray-to purple {
-  step-1: #996699;
-  step-2: #cc33cc;
-  step-3: magenta;
-}
-
-black-to-white-through red {
-  step-1: black;
-  step-2: #330000;
-  step-3: #660000;
-  step-4: #990000;
-  step-5: #cc0000;
-  step-6: red;
-  step-7: #ff3333;
-  step-8: #ff6666;
-  step-9: #ff9999;
-  step-10: #ffcccc;
-  step-11: white;
-}
-
-black-to-white-through yellow {
-  step-1: black;
-  step-2: #333300;
-  step-3: #666600;
-  step-4: #999900;
-  step-5: #cccc00;
-  step-6: yellow;
-  step-7: #ffff33;
-  step-8: #ffff66;
-  step-9: #ffff99;
-  step-10: #ffffcc;
-  step-11: white;
-}
-
-black-to-white-through green {
-  step-1: black;
-  step-2: #003300;
-  step-3: #006600;
-  step-4: #009900;
-  step-5: #00cc00;
-  step-6: lime;
-  step-7: #33ff33;
-  step-8: #66ff66;
-  step-9: #99ff99;
-  step-10: #ccffcc;
-  step-11: white;
-}
-
-black-to-white-through cyan {
-  step-1: black;
-  step-2: #003333;
-  step-3: #006666;
-  step-4: #009999;
-  step-5: #00cccc;
-  step-6: cyan;
-  step-7: #33ffff;
-  step-8: #66ffff;
-  step-9: #99ffff;
-  step-10: #ccffff;
-  step-11: white;
-}
-
-black-to-white-through blue {
-  step-1: black;
-  step-2: #000033;
-  step-3: #000066;
-  step-4: #000099;
-  step-5: #0000cc;
-  step-6: blue;
-  step-7: #3333ff;
-  step-8: #6666ff;
-  step-9: #9999ff;
-  step-10: #ccccff;
-  step-11: white;
-}
-
-black-to-white-through purple {
-  step-1: black;
-  step-2: #330033;
-  step-3: #660066;
-  step-4: #990099;
-  step-5: #cc00cc;
-  step-6: magenta;
-  step-7: #ff33ff;
-  step-8: #ff66ff;
-  step-9: #ff99ff;
-  step-10: #ffccff;
-  step-11: white;
-}
-
-clamped {
-  saturation-above: red;
-  saturation-below: gray;
-  lightness-above: white;
-  lightness-below: black;
-}
-
-units {
-  hue-deg: red;
-  saturation-unitless: #bf4040;
-  lightness-unitless: red;
-}
-
-named {
-  x: red;
-}
diff --git a/spec/core_functions/color/hsl/three_args/clamped.hrx b/spec/core_functions/color/hsl/three_args/clamped.hrx
new file mode 100644
index 0000000000..0a408bcf84
--- /dev/null
+++ b/spec/core_functions/color/hsl/three_args/clamped.hrx
@@ -0,0 +1,42 @@
+<===> README.md
+The W3C tests cover clamped hue, but not clamped saturation or lightness.
+
+<===>
+================================================================================
+<===> saturation/above/input.scss
+a {b: hsl(0, 500%, 50%)}
+
+<===> saturation/above/output.css
+a {
+  b: red;
+}
+
+<===>
+================================================================================
+<===> saturation/below/input.scss
+a {b: hsl(0, -100%, 50%)}
+
+<===> saturation/below/output.css
+a {
+  b: gray;
+}
+
+<===>
+================================================================================
+<===> lightness/above/input.scss
+a {b: hsl(0, 100%, 500%)}
+
+<===> lightness/above/output.css
+a {
+  b: white;
+}
+
+<===>
+================================================================================
+<===> lightness/below/input.scss
+a {b: hsl(0, 100%, -100%)}
+
+<===> lightness/below/output.css
+a {
+  b: black;
+}
diff --git a/spec/core_functions/color/hsl/three_args/named.hrx b/spec/core_functions/color/hsl/three_args/named.hrx
new file mode 100644
index 0000000000..adb0914b4e
--- /dev/null
+++ b/spec/core_functions/color/hsl/three_args/named.hrx
@@ -0,0 +1,8 @@
+<===> input.scss
+a {b: hsl($hue: 0, $saturation: 100%, $lightness: 50%)}
+
+<===> output.css
+a {
+  b: red;
+}
+
diff --git a/spec/core_functions/color/hsl/three_args/special_functions.hrx b/spec/core_functions/color/hsl/three_args/special_functions.hrx
index 3e83d6650d..6866456e1b 100644
--- a/spec/core_functions/color/hsl/three_args/special_functions.hrx
+++ b/spec/core_functions/color/hsl/three_args/special_functions.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2726
+- sass/libsass#2726
 :ignore_for:
 
 <===> input.scss
diff --git a/spec/core_functions/color/hsl/three_args/units.hrx b/spec/core_functions/color/hsl/three_args/units.hrx
new file mode 100644
index 0000000000..7d7a0c2763
--- /dev/null
+++ b/spec/core_functions/color/hsl/three_args/units.hrx
@@ -0,0 +1,27 @@
+<===> hue/deg/input.scss
+a {b: hsl(0deg, 100%, 50%)}
+
+<===> hue/deg/output.css
+a {
+  b: red;
+}
+
+<===>
+================================================================================
+<===> saturation/unitless/input.scss
+a {b: hsl(0, 50, 50%)}
+
+<===> saturation/unitless/output.css
+a {
+  b: #bf4040;
+}
+
+<===>
+================================================================================
+<===> lightness/unitless/input.scss
+a {b: hsl(0, 100%, 50)}
+
+<===> lightness/unitless/output.css
+a {
+  b: red;
+}
diff --git a/spec/core_functions/color/hsl/three_args/w3c.hrx b/spec/core_functions/color/hsl/three_args/w3c.hrx
new file mode 100644
index 0000000000..00f024e794
--- /dev/null
+++ b/spec/core_functions/color/hsl/three_args/w3c.hrx
@@ -0,0 +1,571 @@
+<===> README.md
+These test cases come from two official W3C test suites:
+
+* https://www.w3.org/Style/CSS/Test/CSS3/Color/20070927/html4/t040204-hsl-h-rotating-b.htm
+* https://www.w3.org/Style/CSS/Test/CSS3/Color/current/html4/t040204-hsl-values-b.htm
+
+Because these spces have so many repetitive cases, they violate the normal
+one-test-case-per-suite rule.
+
+<===>
+================================================================================
+<===> hue/input.scss
+@mixin test-hues($name, $hues...) {
+  #{$name} {
+    @each $hue in $hues {
+      hue-#{$hue}: hsl($hue, 100%, 50%);
+    }
+  }
+}
+
+@include test-hues("red", 0, -360, 360, 6120);
+@include test-hues("yellow", 60, -300, 420, -9660);
+@include test-hues("green", 120, -240, 480, 99840);
+@include test-hues("cyan", 180, -180, 540, -900);
+@include test-hues("blue", 240, -120, 600, -104880);
+@include test-hues("purple", 300, -60, 660, 2820);
+
+<===> hue/output.css
+red {
+  hue-0: red;
+  hue--360: red;
+  hue-360: red;
+  hue-6120: red;
+}
+
+yellow {
+  hue-60: yellow;
+  hue--300: yellow;
+  hue-420: yellow;
+  hue--9660: yellow;
+}
+
+green {
+  hue-120: lime;
+  hue--240: lime;
+  hue-480: lime;
+  hue-99840: lime;
+}
+
+cyan {
+  hue-180: aqua;
+  hue--180: aqua;
+  hue-540: aqua;
+  hue--900: aqua;
+}
+
+blue {
+  hue-240: blue;
+  hue--120: blue;
+  hue-600: blue;
+  hue--104880: blue;
+}
+
+purple {
+  hue-300: fuchsia;
+  hue--60: fuchsia;
+  hue-660: fuchsia;
+  hue-2820: fuchsia;
+}
+
+<===> hue/output-libsass.css
+red {
+  hue-0: red;
+  hue--360: red;
+  hue-360: red;
+  hue-6120: red;
+}
+
+yellow {
+  hue-60: yellow;
+  hue--300: yellow;
+  hue-420: yellow;
+  hue--9660: yellow;
+}
+
+green {
+  hue-120: lime;
+  hue--240: lime;
+  hue-480: lime;
+  hue-99840: lime;
+}
+
+cyan {
+  hue-180: cyan;
+  hue--180: cyan;
+  hue-540: cyan;
+  hue--900: cyan;
+}
+
+blue {
+  hue-240: blue;
+  hue--120: blue;
+  hue-600: blue;
+  hue--104880: blue;
+}
+
+purple {
+  hue-300: magenta;
+  hue--60: magenta;
+  hue-660: magenta;
+  hue-2820: magenta;
+}
+
+<===>
+================================================================================
+<===> red_to_green/input.scss
+a {
+  step-1: hsl(0, 100%, 50%);
+  step-2: hsl(12, 100%, 50%);
+  step-3: hsl(24, 100%, 50%);
+  step-4: hsl(36, 100%, 50%);
+  step-5: hsl(48, 100%, 50%);
+  step-6: hsl(60, 100%, 50%);
+  step-7: hsl(72, 100%, 50%);
+  step-8: hsl(84, 100%, 50%);
+  step-9: hsl(96, 100%, 50%);
+  step-10: hsl(108, 100%, 50%);
+  step-11: hsl(120, 100%, 50%);
+}
+
+<===> red_to_green/output.css
+a {
+  step-1: red;
+  step-2: #ff3300;
+  step-3: #ff6600;
+  step-4: #ff9900;
+  step-5: #ffcc00;
+  step-6: yellow;
+  step-7: #ccff00;
+  step-8: #99ff00;
+  step-9: #66ff00;
+  step-10: #33ff00;
+  step-11: lime;
+}
+
+<===>
+================================================================================
+<===> green_to_blue/input.scss
+a {
+  step-1: hsl(120, 100%, 50%);
+  step-2: hsl(132, 100%, 50%);
+  step-3: hsl(144, 100%, 50%);
+  step-4: hsl(156, 100%, 50%);
+  step-5: hsl(168, 100%, 50%);
+  step-6: hsl(180, 100%, 50%);
+  step-7: hsl(192, 100%, 50%);
+  step-8: hsl(204, 100%, 50%);
+  step-9: hsl(216, 100%, 50%);
+  step-10: hsl(228, 100%, 50%);
+  step-11: hsl(240, 100%, 50%);
+}
+
+<===> green_to_blue/output.css
+a {
+  step-1: lime;
+  step-2: #00ff33;
+  step-3: #00ff66;
+  step-4: #00ff99;
+  step-5: #00ffcc;
+  step-6: aqua;
+  step-7: #00ccff;
+  step-8: #0099ff;
+  step-9: #0066ff;
+  step-10: #0033ff;
+  step-11: blue;
+}
+
+<===> green_to_blue/output-libsass.css
+a {
+  step-1: lime;
+  step-2: #00ff33;
+  step-3: #00ff66;
+  step-4: #00ff99;
+  step-5: #00ffcc;
+  step-6: cyan;
+  step-7: #00ccff;
+  step-8: #0099ff;
+  step-9: #0066ff;
+  step-10: #0033ff;
+  step-11: blue;
+}
+
+<===>
+================================================================================
+<===> blue_to_red/input.scss
+a {
+  step-1: hsl(240, 100%, 50%);
+  step-2: hsl(252, 100%, 50%);
+  step-3: hsl(264, 100%, 50%);
+  step-4: hsl(276, 100%, 50%);
+  step-5: hsl(288, 100%, 50%);
+  step-6: hsl(300, 100%, 50%);
+  step-7: hsl(312, 100%, 50%);
+  step-8: hsl(324, 100%, 50%);
+  step-9: hsl(336, 100%, 50%);
+  step-10: hsl(348, 100%, 50%);
+  step-11: hsl(360, 100%, 50%);
+}
+
+<===> blue_to_red/output.css
+a {
+  step-1: blue;
+  step-2: #3300ff;
+  step-3: #6600ff;
+  step-4: #9900ff;
+  step-5: #cc00ff;
+  step-6: fuchsia;
+  step-7: #ff00cc;
+  step-8: #ff0099;
+  step-9: #ff0066;
+  step-10: #ff0033;
+  step-11: red;
+}
+
+<===> blue_to_red/output-libsass.css
+a {
+  step-1: blue;
+  step-2: #3300ff;
+  step-3: #6600ff;
+  step-4: #9900ff;
+  step-5: #cc00ff;
+  step-6: magenta;
+  step-7: #ff00cc;
+  step-8: #ff0099;
+  step-9: #ff0066;
+  step-10: #ff0033;
+  step-11: red;
+}
+
+<===>
+================================================================================
+<===> gray_to/red/input.scss
+a {
+  step-1: hsl(0, 20%, 50%);
+  step-2: hsl(0, 60%, 50%);
+  step-3: hsl(0, 100%, 50%);
+}
+
+<===> gray_to/red/output.css
+a {
+  step-1: #996666;
+  step-2: #cc3333;
+  step-3: red;
+}
+
+<===>
+================================================================================
+<===> gray_to/yellow/input.scss
+a {
+  step-1: hsl(60, 20%, 50%);
+  step-2: hsl(60, 60%, 50%);
+  step-3: hsl(60, 100%, 50%);
+}
+
+<===> gray_to/yellow/output.css
+a {
+  step-1: #999966;
+  step-2: #cccc33;
+  step-3: yellow;
+}
+
+<===>
+================================================================================
+<===> gray_to/green/input.scss
+a {
+  step-1: hsl(120, 20%, 50%);
+  step-2: hsl(120, 60%, 50%);
+  step-3: hsl(120, 100%, 50%);
+}
+
+<===> gray_to/green/output.css
+a {
+  step-1: #669966;
+  step-2: #33cc33;
+  step-3: lime;
+}
+
+<===>
+================================================================================
+<===> gray_to/cyan/input.scss
+a {
+  step-1: hsl(180, 20%, 50%);
+  step-2: hsl(180, 60%, 50%);
+  step-3: hsl(180, 100%, 50%);
+}
+
+<===> gray_to/cyan/output.css
+a {
+  step-1: #669999;
+  step-2: #33cccc;
+  step-3: aqua;
+}
+
+<===> gray_to/cyan/output-libsass.css
+a {
+  step-1: #669999;
+  step-2: #33cccc;
+  step-3: cyan;
+}
+
+<===>
+================================================================================
+<===> gray_to/blue/input.scss
+a {
+  step-1: hsl(240, 20%, 50%);
+  step-2: hsl(240, 60%, 50%);
+  step-3: hsl(240, 100%, 50%);
+}
+
+<===> gray_to/blue/output.css
+a {
+  step-1: #666699;
+  step-2: #3333cc;
+  step-3: blue;
+}
+
+<===>
+================================================================================
+<===> gray_to/purple/input.scss
+a {
+  step-1: hsl(300, 20%, 50%);
+  step-2: hsl(300, 60%, 50%);
+  step-3: hsl(300, 100%, 50%);
+}
+
+<===> gray_to/purple/output.css
+a {
+  step-1: #996699;
+  step-2: #cc33cc;
+  step-3: fuchsia;
+}
+
+<===> gray_to/purple/output-libsass.css
+a {
+  step-1: #996699;
+  step-2: #cc33cc;
+  step-3: magenta;
+}
+
+<===>
+================================================================================
+<===> black_to_white_through/red/input.scss
+a {
+  step-1: hsl(0, 100%, 0%);
+  step-2: hsl(0, 100%, 10%);
+  step-3: hsl(0, 100%, 20%);
+  step-4: hsl(0, 100%, 30%);
+  step-5: hsl(0, 100%, 40%);
+  step-6: hsl(0, 100%, 50%);
+  step-7: hsl(0, 100%, 60%);
+  step-8: hsl(0, 100%, 70%);
+  step-9: hsl(0, 100%, 80%);
+  step-10: hsl(0, 100%, 90%);
+  step-11: hsl(0, 100%, 100%);
+}
+
+<===> black_to_white_through/red/output.css
+a {
+  step-1: black;
+  step-2: #330000;
+  step-3: #660000;
+  step-4: #990000;
+  step-5: #cc0000;
+  step-6: red;
+  step-7: #ff3333;
+  step-8: #ff6666;
+  step-9: #ff9999;
+  step-10: #ffcccc;
+  step-11: white;
+}
+
+<===>
+================================================================================
+<===> black_to_white_through/yellow/input.scss
+a {
+  step-1: hsl(60, 100%, 0%);
+  step-2: hsl(60, 100%, 10%);
+  step-3: hsl(60, 100%, 20%);
+  step-4: hsl(60, 100%, 30%);
+  step-5: hsl(60, 100%, 40%);
+  step-6: hsl(60, 100%, 50%);
+  step-7: hsl(60, 100%, 60%);
+  step-8: hsl(60, 100%, 70%);
+  step-9: hsl(60, 100%, 80%);
+  step-10: hsl(60, 100%, 90%);
+  step-11: hsl(60, 100%, 100%);
+}
+
+<===> black_to_white_through/yellow/output.css
+a {
+  step-1: black;
+  step-2: #333300;
+  step-3: #666600;
+  step-4: #999900;
+  step-5: #cccc00;
+  step-6: yellow;
+  step-7: #ffff33;
+  step-8: #ffff66;
+  step-9: #ffff99;
+  step-10: #ffffcc;
+  step-11: white;
+}
+
+<===>
+================================================================================
+<===> black_to_white_through/green/input.scss
+a {
+  step-1: hsl(120, 100%, 0%);
+  step-2: hsl(120, 100%, 10%);
+  step-3: hsl(120, 100%, 20%);
+  step-4: hsl(120, 100%, 30%);
+  step-5: hsl(120, 100%, 40%);
+  step-6: hsl(120, 100%, 50%);
+  step-7: hsl(120, 100%, 60%);
+  step-8: hsl(120, 100%, 70%);
+  step-9: hsl(120, 100%, 80%);
+  step-10: hsl(120, 100%, 90%);
+  step-11: hsl(120, 100%, 100%);
+}
+
+<===> black_to_white_through/green/output.css
+a {
+  step-1: black;
+  step-2: #003300;
+  step-3: #006600;
+  step-4: #009900;
+  step-5: #00cc00;
+  step-6: lime;
+  step-7: #33ff33;
+  step-8: #66ff66;
+  step-9: #99ff99;
+  step-10: #ccffcc;
+  step-11: white;
+}
+
+<===>
+================================================================================
+<===> black_to_white_through/cyan/input.scss
+a {
+  step-1: hsl(180, 100%, 0%);
+  step-2: hsl(180, 100%, 10%);
+  step-3: hsl(180, 100%, 20%);
+  step-4: hsl(180, 100%, 30%);
+  step-5: hsl(180, 100%, 40%);
+  step-6: hsl(180, 100%, 50%);
+  step-7: hsl(180, 100%, 60%);
+  step-8: hsl(180, 100%, 70%);
+  step-9: hsl(180, 100%, 80%);
+  step-10: hsl(180, 100%, 90%);
+  step-11: hsl(180, 100%, 100%);
+}
+
+<===> black_to_white_through/cyan/output.css
+a {
+  step-1: black;
+  step-2: #003333;
+  step-3: #006666;
+  step-4: #009999;
+  step-5: #00cccc;
+  step-6: aqua;
+  step-7: #33ffff;
+  step-8: #66ffff;
+  step-9: #99ffff;
+  step-10: #ccffff;
+  step-11: white;
+}
+
+<===> black_to_white_through/cyan/output-libsass.css
+a {
+  step-1: black;
+  step-2: #003333;
+  step-3: #006666;
+  step-4: #009999;
+  step-5: #00cccc;
+  step-6: cyan;
+  step-7: #33ffff;
+  step-8: #66ffff;
+  step-9: #99ffff;
+  step-10: #ccffff;
+  step-11: white;
+}
+
+<===>
+================================================================================
+<===> black_to_white_through/blue/input.scss
+a {
+  step-1: hsl(240, 100%, 0%);
+  step-2: hsl(240, 100%, 10%);
+  step-3: hsl(240, 100%, 20%);
+  step-4: hsl(240, 100%, 30%);
+  step-5: hsl(240, 100%, 40%);
+  step-6: hsl(240, 100%, 50%);
+  step-7: hsl(240, 100%, 60%);
+  step-8: hsl(240, 100%, 70%);
+  step-9: hsl(240, 100%, 80%);
+  step-10: hsl(240, 100%, 90%);
+  step-11: hsl(240, 100%, 100%);
+}
+
+<===> black_to_white_through/blue/output.css
+a {
+  step-1: black;
+  step-2: #000033;
+  step-3: #000066;
+  step-4: #000099;
+  step-5: #0000cc;
+  step-6: blue;
+  step-7: #3333ff;
+  step-8: #6666ff;
+  step-9: #9999ff;
+  step-10: #ccccff;
+  step-11: white;
+}
+
+<===>
+================================================================================
+<===> black_to_white_through/purple/input.scss
+a {
+  step-1: hsl(300, 100%, 0%);
+  step-2: hsl(300, 100%, 10%);
+  step-3: hsl(300, 100%, 20%);
+  step-4: hsl(300, 100%, 30%);
+  step-5: hsl(300, 100%, 40%);
+  step-6: hsl(300, 100%, 50%);
+  step-7: hsl(300, 100%, 60%);
+  step-8: hsl(300, 100%, 70%);
+  step-9: hsl(300, 100%, 80%);
+  step-10: hsl(300, 100%, 90%);
+  step-11: hsl(300, 100%, 100%);
+}
+
+<===> black_to_white_through/purple/output.css
+a {
+  step-1: black;
+  step-2: #330033;
+  step-3: #660066;
+  step-4: #990099;
+  step-5: #cc00cc;
+  step-6: fuchsia;
+  step-7: #ff33ff;
+  step-8: #ff66ff;
+  step-9: #ff99ff;
+  step-10: #ffccff;
+  step-11: white;
+}
+
+
+<===> black_to_white_through/purple/output-libsass.css
+a {
+  step-1: black;
+  step-2: #330033;
+  step-3: #660066;
+  step-4: #990099;
+  step-5: #cc00cc;
+  step-6: magenta;
+  step-7: #ff33ff;
+  step-8: #ff66ff;
+  step-9: #ff99ff;
+  step-10: #ffccff;
+  step-11: white;
+}
diff --git a/spec/core_functions/color/hsl/two_args.hrx b/spec/core_functions/color/hsl/two_args.hrx
deleted file mode 100644
index 9f1bb1f4cb..0000000000
--- a/spec/core_functions/color/hsl/two_args.hrx
+++ /dev/null
@@ -1,41 +0,0 @@
-<===> options.yml
----
-:todo:
-- libsass
-
-<===> input.scss
-opaque-to {
-  opaque: hsl(#123, 1);
-  partial: hsl(#123, 0.5);
-  transparent: hsl(#123, 0);
-}
-
-partial-to {
-  $color: hsl(0, 0, 255, 0.3);
-  opaque: hsl($color, 1);
-  partial: hsl($color, 0.5);
-  transparent: hsl($color, 0);
-}
-
-transparent-to {
-  opaque: hsl(transparent, 1);
-  partial: hsl(transparent, 0.5);
-  transparent: hsl(transparent, 0);
-}
-
-clamped {
-  opaque: hsl(#123, 1.1);
-  transparent: hsl(#123, -0.1);
-}
-
-named {
-  x: hsl($color: #123, $alpha: 0.5);
-}
-
-<===> error
-Error: Missing argument $lightness.
-  ,
-2 |   opaque: hsl(#123, 1);
-  |           ^^^^^^^^^^^^
-  '
-  input.scss 2:11  root stylesheet
diff --git a/spec/core_functions/color/hsla/error/one_arg.hrx b/spec/core_functions/color/hsla/error/one_arg.hrx
index f7b63df973..8a44d62914 100644
--- a/spec/core_functions/color/hsla/error/one_arg.hrx
+++ b/spec/core_functions/color/hsla/error/one_arg.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2722
+- sass/libsass#2722
 
 <===>
 ================================================================================
diff --git a/spec/core_functions/color/hsla/error/three_args.hrx b/spec/core_functions/color/hsla/error/three_args.hrx
index 8b850bfc47..28d785c4c9 100644
--- a/spec/core_functions/color/hsla/error/three_args.hrx
+++ b/spec/core_functions/color/hsla/error/three_args.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2722
+- sass/libsass#2722
 
 <===>
 ================================================================================
diff --git a/spec/core_functions/color/hsla/error/two_args.hrx b/spec/core_functions/color/hsla/error/two_args.hrx
index 9bd5593acf..33241bddba 100644
--- a/spec/core_functions/color/hsla/error/two_args.hrx
+++ b/spec/core_functions/color/hsla/error/two_args.hrx
@@ -1,18 +1,17 @@
 <===> input.scss
-one-arg {
-  x: hsla(0, 100%);
-}
+a {b: hsla(#123, 0.5)}
 
 <===> error
 Error: Missing argument $lightness.
   ,
-2 |   x: hsla(0, 100%);
-  |      ^^^^^^^^^^^^^
+1 | a {b: hsla(#123, 0.5)}
+  |       ^^^^^^^^^^^^^^^
   '
-  input.scss 2:6  root stylesheet
+  input.scss 1:7  root stylesheet
 
 <===> error-libsass
 Error: Function hsla is missing argument $lightness.
-        on line 2 of one_arg/input.scss
->>   x: hsla(0, 100%);
-   -----^
+        on line 1 of input.scss
+>> a {b: hsla(#123, 0.5)}
+
+   ------^
diff --git a/spec/core_functions/color/hsla/four_args/alpha.hrx b/spec/core_functions/color/hsla/four_args/alpha.hrx
new file mode 100644
index 0000000000..78993442e3
--- /dev/null
+++ b/spec/core_functions/color/hsla/four_args/alpha.hrx
@@ -0,0 +1,105 @@
+<===> percent/options.yml
+---
+:todo:
+- sass/libsass#2719
+
+<===>
+================================================================================
+<===> percent/negative/input.scss
+a {b: hsla(0, 0, 0, -10%)}
+
+<===> percent/negative/output.css
+a {
+  b: rgba(0, 0, 0, 0);
+}
+
+<===>
+================================================================================
+<===> percent/min/input.scss
+a {b: hsla(0, 0, 0, 0%)}
+
+<===> percent/min/output.css
+a {
+  b: rgba(0, 0, 0, 0);
+}
+
+<===>
+================================================================================
+<===> percent/positive/input.scss
+a {b: hsla(0, 0, 0, 45.6%)}
+
+<===> percent/positive/output.css
+a {
+  b: rgba(0, 0, 0, 0.456);
+}
+
+<===>
+================================================================================
+<===> percent/max/input.scss
+a {b: hsla(0, 0, 0, 100%)}
+
+<===> percent/max/output.css
+a {
+  b: black;
+}
+
+<===>
+================================================================================
+<===> percent/above_max/input.scss
+a {b: hsla(0, 0, 0, 250%)}
+
+<===> percent/above_max/output.css
+a {
+  b: black;
+}
+
+<===>
+================================================================================
+<===> unitless/negative/input.scss
+a {b: hsla(0, 0, 0, -10)}
+
+<===> unitless/negative/output.css
+a {
+  b: rgba(0, 0, 0, 0);
+}
+
+<===>
+================================================================================
+<===> unitless/min/input.scss
+a {b: hsla(0, 0, 0, 0)}
+
+<===> unitless/min/output.css
+a {
+  b: rgba(0, 0, 0, 0);
+}
+
+<===>
+================================================================================
+<===> unitless/positive/input.scss
+a {b: hsla(0, 0, 0, 0.456)}
+
+<===> unitless/positive/output.css
+a {
+  b: rgba(0, 0, 0, 0.456);
+}
+
+<===>
+================================================================================
+<===> unitless/max/input.scss
+a {b: hsla(0, 0, 0, 1)}
+
+<===> unitless/max/output.css
+a {
+  b: black;
+}
+
+<===>
+================================================================================
+<===> unitless/above_max/input.scss
+a {b: hsla(0, 0, 0, 250)}
+
+<===> unitless/above_max/output.css
+a {
+  b: black;
+}
+
diff --git a/spec/core_functions/color/hsla/four_args/alpha_percent.hrx b/spec/core_functions/color/hsla/four_args/alpha_percent.hrx
deleted file mode 100644
index b4a5b2faaa..0000000000
--- a/spec/core_functions/color/hsla/four_args/alpha_percent.hrx
+++ /dev/null
@@ -1,22 +0,0 @@
-<===> options.yml
----
-:todo:
-- libsass # sass/libsass#2719
-
-<===> input.scss
-.alpha-percent {
-  negative: hsla(0, 0, 0, -10%);
-  min: hsla(0, 0, 0, 0%);
-  positive: hsla(0, 0, 0, 45.6%);
-  max: hsla(0, 0, 0, 100%);
-  above-max: hsla(0, 0, 0, 250%);
-}
-
-<===> output.css
-.alpha-percent {
-  negative: rgba(0, 0, 0, 0);
-  min: rgba(0, 0, 0, 0);
-  positive: rgba(0, 0, 0, 0.456);
-  max: black;
-  above-max: black;
-}
diff --git a/spec/core_functions/color/hsla/four_args/alpha_unitless.hrx b/spec/core_functions/color/hsla/four_args/alpha_unitless.hrx
deleted file mode 100644
index 35430ee7e7..0000000000
--- a/spec/core_functions/color/hsla/four_args/alpha_unitless.hrx
+++ /dev/null
@@ -1,17 +0,0 @@
-<===> input.scss
-.alpha-unitless {
-  negative: hsla(0, 0, 0, -10);
-  min: hsla(0, 0, 0, 0);
-  positive: hsla(0, 0, 0, 0.456);
-  max: hsla(0, 0, 0, 1);
-  above-max: hsla(0, 0, 0, 250);
-}
-
-<===> output.css
-.alpha-unitless {
-  negative: rgba(0, 0, 0, 0);
-  min: rgba(0, 0, 0, 0);
-  positive: rgba(0, 0, 0, 0.456);
-  max: black;
-  above-max: black;
-}
diff --git a/spec/core_functions/color/hsla/four_args/basic.hrx b/spec/core_functions/color/hsla/four_args/basic.hrx
deleted file mode 100644
index a5543d889d..0000000000
--- a/spec/core_functions/color/hsla/four_args/basic.hrx
+++ /dev/null
@@ -1,30 +0,0 @@
-<===> input.scss
-basic {
-  transparent: hsla(180, 60%, 50%, 0);
-  opaque: hsla(180, 60%, 50%, 1);
-  partial: hsla(180, 60%, 50%, 0.5);
-  named: hsla($hue: 180, $saturation: 60%, $lightness: 50%, $alpha: 0.4);
-}
-
-// Channels that are out of bounds are clamped within bounds.
-clamped {
-  saturation: hsla(0, -0.1%, 50%, 0.5);
-  blue: hsla(0, 100%, 9999%, 0.5);
-  alpha-above: hsla(0, 100%, 50%, 1.1);
-  alpha-below: rgba(0, 100%, 50%, -0.1);
-}
-
-<===> output.css
-basic {
-  transparent: rgba(51, 204, 204, 0);
-  opaque: #33cccc;
-  partial: rgba(51, 204, 204, 0.5);
-  named: rgba(51, 204, 204, 0.4);
-}
-
-clamped {
-  saturation: rgba(128, 128, 128, 0.5);
-  blue: rgba(255, 255, 255, 0.5);
-  alpha-above: red;
-  alpha-below: rgba(0, 255, 128, 0);
-}
diff --git a/spec/core_functions/color/hsla/four_args/clamped.hrx b/spec/core_functions/color/hsla/four_args/clamped.hrx
new file mode 100644
index 0000000000..4b651628ef
--- /dev/null
+++ b/spec/core_functions/color/hsla/four_args/clamped.hrx
@@ -0,0 +1,43 @@
+<===> README.md
+Channels that are out of bounds are clamped within bounds.
+
+<===>
+================================================================================
+<===> saturation/input.scss
+a {b: hsla(0, -0.1%, 50%, 0.5)}
+
+<===> saturation/output.css
+a {
+  b: rgba(128, 128, 128, 0.5);
+}
+
+<===>
+================================================================================
+<===> lightness/input.scss
+a {b: hsla(0, 100%, 9999%, 0.5)}
+
+<===> lightness/output.css
+a {
+  b: rgba(255, 255, 255, 0.5);
+}
+
+<===>
+================================================================================
+<===> alpha/above/input.scss
+a {b: hsla(0, 100%, 50%, 1.1)}
+
+<===> alpha/above/output.css
+a {
+  b: red;
+}
+
+<===>
+================================================================================
+<===> alpha/below/input.scss
+a {b: rgba(0, 100%, 50%, -0.1)}
+
+<===> alpha/below/output.css
+a {
+  b: rgba(0, 255, 128, 0);
+}
+
diff --git a/spec/core_functions/color/hsla/four_args/in_gamut.hrx b/spec/core_functions/color/hsla/four_args/in_gamut.hrx
new file mode 100644
index 0000000000..39d0533a16
--- /dev/null
+++ b/spec/core_functions/color/hsla/four_args/in_gamut.hrx
@@ -0,0 +1,37 @@
+<===> transparent/input.scss
+a {b: hsla(180, 60%, 50%, 0)}
+
+<===> transparent/output.css
+a {
+  b: rgba(51, 204, 204, 0);
+}
+
+<===>
+================================================================================
+<===> opaque/input.scss
+a {b: hsla(180, 60%, 50%, 1)}
+
+<===> opaque/output.css
+a {
+  b: #33cccc;
+}
+
+<===>
+================================================================================
+<===> partial/input.scss
+a {b: hsla(180, 60%, 50%, 0.5)}
+
+<===> partial/output.css
+a {
+  b: rgba(51, 204, 204, 0.5);
+}
+
+<===>
+================================================================================
+<===> named/input.scss
+a {b: hsla($hue: 180, $saturation: 60%, $lightness: 50%, $alpha: 0.4)}
+
+<===> named/output.css
+a {
+  b: rgba(51, 204, 204, 0.4);
+}
diff --git a/spec/core_functions/color/hsla/four_args/special_functions.hrx b/spec/core_functions/color/hsla/four_args/special_functions.hrx
index 2fccd9c8bb..c707eddb3f 100644
--- a/spec/core_functions/color/hsla/four_args/special_functions.hrx
+++ b/spec/core_functions/color/hsla/four_args/special_functions.hrx
@@ -1,56 +1,205 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2726
-
-<===> input.scss
-a {
-  calc-1: hsla(calc(1), 2%, 3%, 0.4);
-  calc-2: hsla(1, calc(2%), 3%, 0.4);
-  calc-3: hsla(1, 2%, calc(3%), 0.4);
-  calc-4: hsla(1, 2%, 3%, calc(0.4));
-
-  var-1: hsla(var(--foo), 2%, 3%, 0.4);
-  var-2: hsla(1, var(--foo), 3%, 0.4);
-  var-3: hsla(1, 2%, var(--foo), 0.4);
-  var-4: hsla(1, 2%, 3%, var(--foo));
-
-  env-1: hsla(env(--foo), 2%, 3%, 0.4);
-  env-2: hsla(1, env(--foo), 3%, 0.4);
-  env-3: hsla(1, 2%, env(--foo), 0.4);
-  env-4: hsla(1, 2%, 3%, env(--foo));
-
-  min-1: hsla(min(1), 2%, 3%, 0.4);
-  min-2: hsla(1, min(2%), 3%, 0.4);
-  min-3: hsla(1, 2%, min(3%), 0.4);
-  min-4: hsla(1, 2%, 3%, min(0.4));
-
-  max-1: hsla(max(1), 2%, 3%, 0.4);
-  max-2: hsla(1, max(2%), 3%, 0.4);
-  max-3: hsla(1, 2%, max(3%), 0.4);
-  max-4: hsla(1, 2%, 3%, max(0.4));
-}
-
-<===> output.css
-a {
-  calc-1: hsla(calc(1), 2%, 3%, 0.4);
-  calc-2: hsla(1, calc(2%), 3%, 0.4);
-  calc-3: hsla(1, 2%, calc(3%), 0.4);
-  calc-4: hsla(1, 2%, 3%, calc(0.4));
-  var-1: hsla(var(--foo), 2%, 3%, 0.4);
-  var-2: hsla(1, var(--foo), 3%, 0.4);
-  var-3: hsla(1, 2%, var(--foo), 0.4);
-  var-4: hsla(1, 2%, 3%, var(--foo));
-  env-1: hsla(env(--foo), 2%, 3%, 0.4);
-  env-2: hsla(1, env(--foo), 3%, 0.4);
-  env-3: hsla(1, 2%, env(--foo), 0.4);
-  env-4: hsla(1, 2%, 3%, env(--foo));
-  min-1: hsla(min(1), 2%, 3%, 0.4);
-  min-2: hsla(1, min(2%), 3%, 0.4);
-  min-3: hsla(1, 2%, min(3%), 0.4);
-  min-4: hsla(1, 2%, 3%, min(0.4));
-  max-1: hsla(max(1), 2%, 3%, 0.4);
-  max-2: hsla(1, max(2%), 3%, 0.4);
-  max-3: hsla(1, 2%, max(3%), 0.4);
-  max-4: hsla(1, 2%, 3%, max(0.4));
+- sass/libsass#2726
+
+<===>
+================================================================================
+<===> calc/arg_1/input.scss
+a {b: hsla(calc(1), 2%, 3%, 0.4)}
+
+<===> calc/arg_1/output.css
+a {
+  b: hsla(calc(1), 2%, 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> calc/arg_2/input.scss
+a {b: hsla(1, calc(2%), 3%, 0.4)}
+
+<===> calc/arg_2/output.css
+a {
+  b: hsla(1, calc(2%), 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> calc/arg_3/input.scss
+a {b: hsla(1, 2%, calc(3%), 0.4)}
+
+<===> calc/arg_3/output.css
+a {
+  b: hsla(1, 2%, calc(3%), 0.4);
+}
+
+<===>
+================================================================================
+<===> calc/arg_4/input.scss
+a {b: hsla(1, 2%, 3%, calc(0.4))}
+
+<===> calc/arg_4/output.css
+a {
+  b: hsla(1, 2%, 3%, calc(0.4));
+}
+
+<===>
+================================================================================
+<===> var/arg_1/input.scss
+a {b: hsla(var(--foo), 2%, 3%, 0.4)}
+
+<===> var/arg_1/output.css
+a {
+  b: hsla(var(--foo), 2%, 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> var/arg_2/input.scss
+a {b: hsla(1, var(--foo), 3%, 0.4)}
+
+<===> var/arg_2/output.css
+a {
+  b: hsla(1, var(--foo), 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> var/arg_3/input.scss
+a {b: hsla(1, 2%, var(--foo), 0.4)}
+
+<===> var/arg_3/output.css
+a {
+  b: hsla(1, 2%, var(--foo), 0.4);
+}
+
+<===>
+================================================================================
+<===> var/arg_4/input.scss
+a {b: hsla(1, 2%, 3%, var(--foo))}
+
+<===> var/arg_4/output.css
+a {
+  b: hsla(1, 2%, 3%, var(--foo));
+}
+
+<===>
+================================================================================
+<===> env/arg_1/input.scss
+a {b: hsla(env(--foo), 2%, 3%, 0.4)}
+
+<===> env/arg_1/output.css
+a {
+  b: hsla(env(--foo), 2%, 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> env/arg_2/input.scss
+a {b: hsla(1, env(--foo), 3%, 0.4)}
+
+<===> env/arg_2/output.css
+a {
+  b: hsla(1, env(--foo), 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> env/arg_3/input.scss
+a {b: hsla(1, 2%, env(--foo), 0.4)}
+
+<===> env/arg_3/output.css
+a {
+  b: hsla(1, 2%, env(--foo), 0.4);
+}
+
+<===>
+================================================================================
+<===> env/arg_4/input.scss
+a {b: hsla(1, 2%, 3%, env(--foo))}
+
+<===> env/arg_4/output.css
+a {
+  b: hsla(1, 2%, 3%, env(--foo));
+}
+
+<===>
+================================================================================
+<===> min/arg_1/input.scss
+a {b: hsla(min(1), 2%, 3%, 0.4)}
+
+<===> min/arg_1/output.css
+a {
+  b: hsla(min(1), 2%, 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> min/arg_2/input.scss
+a {b: hsla(1, min(2%), 3%, 0.4)}
+
+<===> min/arg_2/output.css
+a {
+  b: hsla(1, min(2%), 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> min/arg_3/input.scss
+a {b: hsla(1, 2%, min(3%), 0.4)}
+
+<===> min/arg_3/output.css
+a {
+  b: hsla(1, 2%, min(3%), 0.4);
+}
+
+<===>
+================================================================================
+<===> min/arg_4/input.scss
+a {b: hsla(1, 2%, 3%, min(0.4))}
+
+<===> min/arg_4/output.css
+a {
+  b: hsla(1, 2%, 3%, min(0.4));
+}
+
+<===>
+================================================================================
+<===> max/arg_1/input.scss
+a {b: hsla(max(1), 2%, 3%, 0.4)}
+
+<===> max/arg_1/output.css
+a {
+  b: hsla(max(1), 2%, 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> max/arg_2/input.scss
+a {b: hsla(1, max(2%), 3%, 0.4)}
+
+<===> max/arg_2/output.css
+a {
+  b: hsla(1, max(2%), 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> max/arg_3/input.scss
+a {b: hsla(1, 2%, max(3%), 0.4)}
+
+<===> max/arg_3/output.css
+a {
+  b: hsla(1, 2%, max(3%), 0.4);
 }
+
+<===>
+================================================================================
+<===> max/arg_4/input.scss
+a {b: hsla(1, 2%, 3%, max(0.4))}
+
+<===> max/arg_4/output.css
+a {
+  b: hsla(1, 2%, 3%, max(0.4));
+}
+
diff --git a/spec/core_functions/color/hsla/multi_argument_var.hrx b/spec/core_functions/color/hsla/multi_argument_var.hrx
index 91b69a46bd..5dca1e0706 100644
--- a/spec/core_functions/color/hsla/multi_argument_var.hrx
+++ b/spec/core_functions/color/hsla/multi_argument_var.hrx
@@ -3,23 +3,64 @@
 :todo:
 - libsass
 
-<===> input.scss
+<===>
+================================================================================
+<===> 1_of_3/input.scss
+// var() is substituted before parsing, so it may contain multiple arguments.
+a {b: hsla(var(--foo), 3%, 0.4)}
+
+<===> 1_of_3/output.css
 a {
-  // var() is substituted before parsing, so it may contain multiple arguments.
   b: hsla(var(--foo), 3%, 0.4);
-  b: hsla(1, var(--foo), 0.4);
-  b: hsla(1, 2%, var(--foo));
-  b: hsla(var(--foo), 0.4);
-  b: hsla(1, var(--foo));
-  b: hsla(var(--foo));
 }
 
-<===> output.css
+<===>
+================================================================================
+<===> 2_of_3/input.scss
+a {b: hsla(1, var(--foo), 0.4)}
+
+<===> 2_of_3/output.css
 a {
-  b: hsla(var(--foo), 3%, 0.4);
   b: hsla(1, var(--foo), 0.4);
+}
+
+<===>
+================================================================================
+<===> 3_of_3/input.scss
+a {b: hsla(1, 2%, var(--foo))}
+
+<===> 3_of_3/output.css
+a {
   b: hsla(1, 2%, var(--foo));
+}
+
+<===>
+================================================================================
+<===> 1_of_2/input.scss
+a {b: hsla(var(--foo), 0.4)}
+
+<===> 1_of_2/output.css
+a {
   b: hsla(var(--foo), 0.4);
+}
+
+<===>
+================================================================================
+<===> 2_of_2/input.scss
+a {b: hsla(1, var(--foo))}
+
+<===> 2_of_2/output.css
+a {
   b: hsla(1, var(--foo));
+}
+
+<===>
+================================================================================
+<===> 1_of_1/input.scss
+a {b: hsla(var(--foo))}
+
+<===> 1_of_1/output.css
+a {
   b: hsla(var(--foo));
 }
+
diff --git a/spec/core_functions/color/hsla/one_arg/alpha.hrx b/spec/core_functions/color/hsla/one_arg/alpha.hrx
index 9bb3ecc368..b8c6f16346 100644
--- a/spec/core_functions/color/hsla/one_arg/alpha.hrx
+++ b/spec/core_functions/color/hsla/one_arg/alpha.hrx
@@ -1,33 +1,89 @@
-<===> input.scss
-basic {
-  transparent: hsla(180 60% 50% / 0);
-  opaque: hsla(180 60% 50% / 1);
-  partial: hsla(180 60% 50% / 0.5);
-  named: hsla($channels: 180 60% 50% / 0.4);
+<===> in_gamut/transparent/input.scss
+a {b: hsla(180 60% 50% / 0)}
 
-  // Extra parens shouldn't cause the slash to be forced into division.
-  parenthesized: (hsl(180 60% 50% / 0.4));
+<===> in_gamut/transparent/output.css
+a {
+  b: rgba(51, 204, 204, 0);
 }
 
-clamped {
-  saturation: hsla(0 -0.1% 50% / 0.5);
-  lightness: hsla(0 100% 9999% / 0.5);
-  alpha-above: hsla(0 100% 50% / 1.1);
-  alpha-below: hsla(0 100% 50% / -0.1);
+<===>
+================================================================================
+<===> in_gamut/opaque/input.scss
+a {b: hsla(180 60% 50% / 1)}
+
+<===> in_gamut/opaque/output.css
+a {
+  b: #33cccc;
+}
+
+<===>
+================================================================================
+<===> in_gamut/partial/input.scss
+a {b: hsla(180 60% 50% / 0.5)}
+
+<===> in_gamut/partial/output.css
+a {
+  b: rgba(51, 204, 204, 0.5);
+}
+
+<===>
+================================================================================
+<===> in_gamut/named/input.scss
+a {b: hsla($channels: 180 60% 50% / 0.4)}
+
+<===> in_gamut/named/output.css
+a {
+  b: rgba(51, 204, 204, 0.4);
 }
 
-<===> output.css
-basic {
-  transparent: rgba(51, 204, 204, 0);
-  opaque: #33cccc;
-  partial: rgba(51, 204, 204, 0.5);
-  named: rgba(51, 204, 204, 0.4);
-  parenthesized: rgba(51, 204, 204, 0.4);
+<===>
+================================================================================
+<===> in_gamut/parenthesized/input.scss
+// Extra parens shouldn't cause the slash to be forced into division.
+a {b: hsl(180 60% 50% / 0.4)}
+
+<===> in_gamut/parenthesized/output.css
+a {
+  b: rgba(51, 204, 204, 0.4);
 }
 
-clamped {
-  saturation: rgba(128, 128, 128, 0.5);
-  lightness: rgba(255, 255, 255, 0.5);
-  alpha-above: red;
-  alpha-below: rgba(255, 0, 0, 0);
+<===>
+================================================================================
+<===> clamped/saturation/input.scss
+a {b: hsla(0 -0.1% 50% / 0.5)}
+
+<===> clamped/saturation/output.css
+a {
+  b: rgba(128, 128, 128, 0.5);
 }
+
+<===>
+================================================================================
+<===> clamped/lightness/input.scss
+a {b: hsla(0 100% 9999% / 0.5)}
+
+<===> clamped/lightness/output.css
+a {
+  b: rgba(255, 255, 255, 0.5);
+}
+
+<===>
+================================================================================
+<===> clamped/alpha/above/input.scss
+a {b: hsla(0 100% 50% / 1.1)}
+
+<===> clamped/alpha/above/output.css
+a {
+  b: red;
+}
+
+<===>
+================================================================================
+<===> clamped/alpha/below/input.scss
+a {b: hsla(0 100% 50% / -0.1)}
+
+<===> clamped/alpha/below/output.css
+a {
+  b: rgba(255, 0, 0, 0);
+}
+
diff --git a/spec/core_functions/color/hsla/one_arg/basic.hrx b/spec/core_functions/color/hsla/one_arg/basic.hrx
deleted file mode 100644
index ff4ec87339..0000000000
--- a/spec/core_functions/color/hsla/one_arg/basic.hrx
+++ /dev/null
@@ -1,48 +0,0 @@
-<===> input.scss
-basic {
-  red: hsla(0 100% 50%);
-  blue: hsla(240 100% 50%);
-  grayish-yellow: hsla(60 60% 50%);
-}
-
-clamped {
-  saturation-above: hsla(0 500% 50%);
-  saturation-below: hsla(0 -100% 50%);
-  lightness-above: hsla(0 100% 500%);
-  lightness-below: hsla(0 100% -100%);
-}
-
-units {
-  hue-deg: hsla(0deg 100% 50%);
-  saturation-unitless: hsla(0 50 50%);
-  lightness-unitless: hsla(0 100% 50);
-}
-
-named {
-  x: hsla($channels: 0 100% 50%);
-}
-
-<===> output.css
-basic {
-  red: red;
-  blue: blue;
-  grayish-yellow: #cccc33;
-}
-
-
-clamped {
-  saturation-above: red;
-  saturation-below: gray;
-  lightness-above: white;
-  lightness-below: black;
-}
-
-units {
-  hue-deg: red;
-  saturation-unitless: #bf4040;
-  lightness-unitless: red;
-}
-
-named {
-  x: red;
-}
diff --git a/spec/core_functions/color/hsla/one_arg/no_alpha.hrx b/spec/core_functions/color/hsla/one_arg/no_alpha.hrx
new file mode 100644
index 0000000000..4a4eecfb97
--- /dev/null
+++ b/spec/core_functions/color/hsla/one_arg/no_alpha.hrx
@@ -0,0 +1,108 @@
+<===> in_gamut/red/input.scss
+a {b: hsla(0 100% 50%)}
+
+<===> in_gamut/red/output.css
+a {
+  b: red;
+}
+
+<===>
+================================================================================
+<===> in_gamut/blue/input.scss
+a {b: hsla(240 100% 50%)}
+
+<===> in_gamut/blue/output.css
+a {
+  b: blue;
+}
+
+<===>
+================================================================================
+<===> in_gamut/grayish/yellow/input.scss
+a {b: hsla(60 60% 50%)}
+
+<===> in_gamut/grayish/yellow/output.css
+a {
+  b: #cccc33;
+}
+
+<===>
+================================================================================
+<===> clamped/saturation/above/input.scss
+a {b: hsla(0 500% 50%)}
+
+<===> clamped/saturation/above/output.css
+a {
+  b: red;
+}
+
+<===>
+================================================================================
+<===> clamped/saturation/below/input.scss
+a {b: hsla(0 -100% 50%)}
+
+<===> clamped/saturation/below/output.css
+a {
+  b: gray;
+}
+
+<===>
+================================================================================
+<===> clamped/lightness/above/input.scss
+a {b: hsla(0 100% 500%)}
+
+<===> clamped/lightness/above/output.css
+a {
+  b: white;
+}
+
+<===>
+================================================================================
+<===> clamped/lightness/below/input.scss
+a {b: hsla(0 100% -100%)}
+
+<===> clamped/lightness/below/output.css
+a {
+  b: black;
+}
+
+<===>
+================================================================================
+<===> units/hue/deg/input.scss
+a {b: hsla(0deg 100% 50%)}
+
+<===> units/hue/deg/output.css
+a {
+  b: red;
+}
+
+<===>
+================================================================================
+<===> units/saturation/unitless/input.scss
+a {b: hsla(0 50 50%)}
+
+<===> units/saturation/unitless/output.css
+a {
+  b: #bf4040;
+}
+
+<===>
+================================================================================
+<===> units/lightness/unitless/input.scss
+a {b: hsla(0 100% 50)}
+
+<===> units/lightness/unitless/output.css
+a {
+  b: red;
+}
+
+<===>
+================================================================================
+<===> named/input.scss
+a {b: hsla($channels: 0 100% 50%)}
+
+<===> named/output.css
+a {
+  b: red;
+}
+
diff --git a/spec/core_functions/color/hsla/one_arg/options.yml b/spec/core_functions/color/hsla/one_arg/options.yml
index 076f9d2d59..018b0da451 100644
--- a/spec/core_functions/color/hsla/one_arg/options.yml
+++ b/spec/core_functions/color/hsla/one_arg/options.yml
@@ -1,3 +1,3 @@
 ---
 :todo:
-- libsass # sass/libsass#2722
+- sass/libsass#2722
diff --git a/spec/core_functions/color/hsla/one_arg/special_functions.hrx b/spec/core_functions/color/hsla/one_arg/special_functions.hrx
index eb264e637e..eb84858bbd 100644
--- a/spec/core_functions/color/hsla/one_arg/special_functions.hrx
+++ b/spec/core_functions/color/hsla/one_arg/special_functions.hrx
@@ -1,112 +1,416 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2726
-
-<===> input.scss
-no-alpha {
-  calc-1: hsla(calc(1) 2% 3%);
-  calc-2: hsla(1 calc(2%) 3%);
-  calc-3: hsla(1 2% calc(3%));
-
-  var-1: hsla(var(--foo) 2% 3%);
-  var-2: hsla(1 var(--foo) 3%);
-  var-3: hsla(1 2% var(--foo));
-
-  env-1: hsla(env(--foo) 2% 3%);
-  env-2: hsla(1 env(--foo) 3%);
-  env-3: hsla(1 2% env(--foo));
-
-  min-1: hsla(min(1) 2% 3%);
-  min-2: hsla(1 min(2%) 3%);
-  min-3: hsla(1 2% min(3%));
-
-  max-1: hsla(max(1) 2% 3%);
-  max-2: hsla(1 max(2%) 3%);
-  max-3: hsla(1 2% max(3%));
-
-  // var() is substituted before parsing, so it may contain multiple arguments.
-  multi-argument-var-1-of-2: hsla(var(--foo) 50%);
-  multi-argument-var-2-of-2: hsla(0 var(--foo));
-  multi-argument-var-1-of-1: hsla(var(--foo));
-}
-
-alpha {
-  calc-1: hsla(calc(1) 2% 3% / 0.4);
-  calc-2: hsla(1 calc(2%) 3% / 0.4);
-  calc-3: hsla(1 2% calc(3%) / 0.4);
-  calc-4: hsla(1 2% 3% / calc(0.4));
-
-  var-1: hsla(var(--foo) 2% 3% / 0.4);
-  var-2: hsla(1 var(--foo) 3% / 0.4);
-  var-3: hsla(1 2% var(--foo) / 0.4);
-  var-4: hsla(1 2% 3% / var(--foo));
-
-  env-1: hsla(env(--foo) 2% 3% / 0.4);
-  env-2: hsla(1 env(--foo) 3% / 0.4);
-  env-3: hsla(1 2% env(--foo) / 0.4);
-  env-4: hsla(1 2% 3% / env(--foo));
-
-  min-1: hsla(min(1) 2% 3% / 0.4);
-  min-2: hsla(1 min(2%) 3% / 0.4);
-  min-3: hsla(1 2% min(3%) / 0.4);
-  min-4: hsla(1 2% 3% / min(0.4));
-
-  max-1: hsla(max(1) 2% 3% / 0.4);
-  max-2: hsla(1 max(2%) 3% / 0.4);
-  max-3: hsla(1 2% max(3%) / 0.4);
-  max-4: hsla(1 2% 3% / max(0.4));
-
-  // var() is substituted before parsing, so it may contain multiple arguments.
-  multi-argument-var-1-of-2: hsla(var(--foo) 50% / 0.4);
-  multi-argument-var-2-of-2: hsla(0 var(--foo) / 0.4);
-  multi-argument-var-1-of-1: hsla(var(--foo) / 0.4);
-}
-
-<===> output.css
-no-alpha {
-  calc-1: hsla(calc(1), 2%, 3%);
-  calc-2: hsla(1, calc(2%), 3%);
-  calc-3: hsla(1, 2%, calc(3%));
-  var-1: hsla(var(--foo), 2%, 3%);
-  var-2: hsla(1, var(--foo), 3%);
-  var-3: hsla(1, 2%, var(--foo));
-  env-1: hsla(env(--foo), 2%, 3%);
-  env-2: hsla(1, env(--foo), 3%);
-  env-3: hsla(1, 2%, env(--foo));
-  min-1: hsla(min(1), 2%, 3%);
-  min-2: hsla(1, min(2%), 3%);
-  min-3: hsla(1, 2%, min(3%));
-  max-1: hsla(max(1), 2%, 3%);
-  max-2: hsla(1, max(2%), 3%);
-  max-3: hsla(1, 2%, max(3%));
-  multi-argument-var-1-of-2: hsla(var(--foo) 50%);
-  multi-argument-var-2-of-2: hsla(0 var(--foo));
-  multi-argument-var-1-of-1: hsla(var(--foo));
-}
-
-alpha {
-  calc-1: hsla(calc(1), 2%, 3%, 0.4);
-  calc-2: hsla(1, calc(2%), 3%, 0.4);
-  calc-3: hsla(1 2% calc(3%)/0.4);
-  calc-4: hsla(1 2% 3%/calc(0.4));
-  var-1: hsla(var(--foo), 2%, 3%, 0.4);
-  var-2: hsla(1, var(--foo), 3%, 0.4);
-  var-3: hsla(1 2% var(--foo)/0.4);
-  var-4: hsla(1 2% 3%/var(--foo));
-  env-1: hsla(env(--foo), 2%, 3%, 0.4);
-  env-2: hsla(1, env(--foo), 3%, 0.4);
-  env-3: hsla(1 2% env(--foo)/0.4);
-  env-4: hsla(1 2% 3%/env(--foo));
-  min-1: hsla(min(1), 2%, 3%, 0.4);
-  min-2: hsla(1, min(2%), 3%, 0.4);
-  min-3: hsla(1 2% min(3%)/0.4);
-  min-4: hsla(1 2% 3%/min(0.4));
-  max-1: hsla(max(1), 2%, 3%, 0.4);
-  max-2: hsla(1, max(2%), 3%, 0.4);
-  max-3: hsla(1 2% max(3%)/0.4);
-  max-4: hsla(1 2% 3%/max(0.4));
-  multi-argument-var-1-of-2: hsla(var(--foo) 50%/0.4);
-  multi-argument-var-2-of-2: hsla(0 var(--foo)/0.4);
-  multi-argument-var-1-of-1: hsla(var(--foo)/0.4);
+- sass/libsass#2726
+
+<===>
+================================================================================
+<===> no_alpha/calc/arg_1/input.scss
+a {b: hsla(calc(1) 2% 3%)}
+
+<===> no_alpha/calc/arg_1/output.css
+a {
+  b: hsla(calc(1), 2%, 3%);
+}
+
+<===>
+================================================================================
+<===> no_alpha/calc/arg_2/input.scss
+a {b: hsla(1 calc(2%) 3%)}
+
+<===> no_alpha/calc/arg_2/output.css
+a {
+  b: hsla(1, calc(2%), 3%);
+}
+
+<===>
+================================================================================
+<===> no_alpha/calc/arg_3/input.scss
+a {b: hsla(1 2% calc(3%))}
+
+<===> no_alpha/calc/arg_3/output.css
+a {
+  b: hsla(1, 2%, calc(3%));
+}
+
+<===>
+================================================================================
+<===> no_alpha/var/arg_1/input.scss
+a {b: hsla(var(--foo) 2% 3%)}
+
+<===> no_alpha/var/arg_1/output.css
+a {
+  b: hsla(var(--foo), 2%, 3%);
+}
+
+<===>
+================================================================================
+<===> no_alpha/var/arg_2/input.scss
+a {b: hsla(1 var(--foo) 3%)}
+
+<===> no_alpha/var/arg_2/output.css
+a {
+  b: hsla(1, var(--foo), 3%);
+}
+
+<===>
+================================================================================
+<===> no_alpha/var/arg_3/input.scss
+a {b: hsla(1 2% var(--foo))}
+
+<===> no_alpha/var/arg_3/output.css
+a {
+  b: hsla(1, 2%, var(--foo));
+}
+
+<===>
+================================================================================
+<===> no_alpha/env/arg_1/input.scss
+a {b: hsla(env(--foo) 2% 3%)}
+
+<===> no_alpha/env/arg_1/output.css
+a {
+  b: hsla(env(--foo), 2%, 3%);
+}
+
+<===>
+================================================================================
+<===> no_alpha/env/arg_2/input.scss
+a {b: hsla(1 env(--foo) 3%)}
+
+<===> no_alpha/env/arg_2/output.css
+a {
+  b: hsla(1, env(--foo), 3%);
+}
+
+<===>
+================================================================================
+<===> no_alpha/env/arg_3/input.scss
+a {b: hsla(1 2% env(--foo))}
+
+<===> no_alpha/env/arg_3/output.css
+a {
+  b: hsla(1, 2%, env(--foo));
+}
+
+<===>
+================================================================================
+<===> no_alpha/min/arg_1/input.scss
+a {b: hsla(min(1) 2% 3%)}
+
+<===> no_alpha/min/arg_1/output.css
+a {
+  b: hsla(min(1), 2%, 3%);
+}
+
+<===>
+================================================================================
+<===> no_alpha/min/arg_2/input.scss
+a {b: hsla(1 min(2%) 3%)}
+
+<===> no_alpha/min/arg_2/output.css
+a {
+  b: hsla(1, min(2%), 3%);
+}
+
+<===>
+================================================================================
+<===> no_alpha/min/arg_3/input.scss
+a {b: hsla(1 2% min(3%))}
+
+<===> no_alpha/min/arg_3/output.css
+a {
+  b: hsla(1, 2%, min(3%));
+}
+
+<===>
+================================================================================
+<===> no_alpha/max/arg_1/input.scss
+a {b: hsla(max(1) 2% 3%)}
+
+<===> no_alpha/max/arg_1/output.css
+a {
+  b: hsla(max(1), 2%, 3%);
+}
+
+<===>
+================================================================================
+<===> no_alpha/max/arg_2/input.scss
+a {b: hsla(1 max(2%) 3%)}
+
+<===> no_alpha/max/arg_2/output.css
+a {
+  b: hsla(1, max(2%), 3%);
+}
+
+<===>
+================================================================================
+<===> no_alpha/max/arg_3/input.scss
+a {b: hsla(1 2% max(3%))}
+
+<===> no_alpha/max/arg_3/output.css
+a {
+  b: hsla(1, 2%, max(3%));
+}
+
+<===>
+================================================================================
+<===> no_alpha/multi_argument_var/1_of_2/input.scss
+// var() is substituted before parsing, so it may contain multiple arguments.
+a {b: hsla(var(--foo) 50%)}
+
+<===> no_alpha/multi_argument_var/1_of_2/output.css
+a {
+  b: hsla(var(--foo) 50%);
+}
+
+<===>
+================================================================================
+<===> no_alpha/multi_argument_var/2_of_2/input.scss
+a {b: hsla(0 var(--foo))}
+
+<===> no_alpha/multi_argument_var/2_of_2/output.css
+a {
+  b: hsla(0 var(--foo));
+}
+
+<===>
+================================================================================
+<===> no_alpha/multi_argument_var/1_of_1/input.scss
+a {b: hsla(var(--foo))}
+
+<===> no_alpha/multi_argument_var/1_of_1/output.css
+a {
+  b: hsla(var(--foo));
+}
+
+<===>
+================================================================================
+<===> alpha/calc/arg_1/input.scss
+a {b: hsla(calc(1) 2% 3% / 0.4)}
+
+<===> alpha/calc/arg_1/output.css
+a {
+  b: hsla(calc(1), 2%, 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/calc/arg_2/input.scss
+a {b: hsla(1 calc(2%) 3% / 0.4)}
+
+<===> alpha/calc/arg_2/output.css
+a {
+  b: hsla(1, calc(2%), 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/calc/arg_3/input.scss
+a {b: hsla(1 2% calc(3%) / 0.4)}
+
+<===> alpha/calc/arg_3/output.css
+a {
+  b: hsla(1 2% calc(3%)/0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/calc/arg_4/input.scss
+a {b: hsla(1 2% 3% / calc(0.4))}
+
+<===> alpha/calc/arg_4/output.css
+a {
+  b: hsla(1 2% 3%/calc(0.4));
+}
+
+<===>
+================================================================================
+<===> alpha/var/arg_1/input.scss
+a {b: hsla(var(--foo) 2% 3% / 0.4)}
+
+<===> alpha/var/arg_1/output.css
+a {
+  b: hsla(var(--foo), 2%, 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/var/arg_2/input.scss
+a {b: hsla(1 var(--foo) 3% / 0.4)}
+
+<===> alpha/var/arg_2/output.css
+a {
+  b: hsla(1, var(--foo), 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/var/arg_3/input.scss
+a {b: hsla(1 2% var(--foo) / 0.4)}
+
+<===> alpha/var/arg_3/output.css
+a {
+  b: hsla(1 2% var(--foo)/0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/var/arg_4/input.scss
+a {b: hsla(1 2% 3% / var(--foo))}
+
+<===> alpha/var/arg_4/output.css
+a {
+  b: hsla(1 2% 3%/var(--foo));
+}
+
+<===>
+================================================================================
+<===> alpha/env/arg_1/input.scss
+a {b: hsla(env(--foo) 2% 3% / 0.4)}
+
+<===> alpha/env/arg_1/output.css
+a {
+  b: hsla(env(--foo), 2%, 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/env/arg_2/input.scss
+a {b: hsla(1 env(--foo) 3% / 0.4)}
+
+<===> alpha/env/arg_2/output.css
+a {
+  b: hsla(1, env(--foo), 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/env/arg_3/input.scss
+a {b: hsla(1 2% env(--foo) / 0.4)}
+
+<===> alpha/env/arg_3/output.css
+a {
+  b: hsla(1 2% env(--foo)/0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/env/arg_4/input.scss
+a {b: hsla(1 2% 3% / env(--foo))}
+
+<===> alpha/env/arg_4/output.css
+a {
+  b: hsla(1 2% 3%/env(--foo));
+}
+
+<===>
+================================================================================
+<===> alpha/min/arg_1/input.scss
+a {b: hsla(min(1) 2% 3% / 0.4)}
+
+<===> alpha/min/arg_1/output.css
+a {
+  b: hsla(min(1), 2%, 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/min/arg_2/input.scss
+a {b: hsla(1 min(2%) 3% / 0.4)}
+
+<===> alpha/min/arg_2/output.css
+a {
+  b: hsla(1, min(2%), 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/min/arg_3/input.scss
+a {b: hsla(1 2% min(3%) / 0.4)}
+
+<===> alpha/min/arg_3/output.css
+a {
+  b: hsla(1 2% min(3%)/0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/min/arg_4/input.scss
+a {b: hsla(1 2% 3% / min(0.4))}
+
+<===> alpha/min/arg_4/output.css
+a {
+  b: hsla(1 2% 3%/min(0.4));
+}
+
+<===>
+================================================================================
+<===> alpha/max/arg_1/input.scss
+a {b: hsla(max(1) 2% 3% / 0.4)}
+
+<===> alpha/max/arg_1/output.css
+a {
+  b: hsla(max(1), 2%, 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/max/arg_2/input.scss
+a {b: hsla(1 max(2%) 3% / 0.4)}
+
+<===> alpha/max/arg_2/output.css
+a {
+  b: hsla(1, max(2%), 3%, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/max/arg_3/input.scss
+a {b: hsla(1 2% max(3%) / 0.4)}
+
+<===> alpha/max/arg_3/output.css
+a {
+  b: hsla(1 2% max(3%)/0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/max/arg_4/input.scss
+a {b: hsla(1 2% 3% / max(0.4))}
+
+<===> alpha/max/arg_4/output.css
+a {
+  b: hsla(1 2% 3%/max(0.4));
+}
+
+<===>
+================================================================================
+<===> alpha/multi_argument_var/1_of_2/input.scss
+// var() is substituted before parsing, so it may contain multiple arguments.
+a {b: hsla(var(--foo) 50% / 0.4)}
+
+<===> alpha/multi_argument_var/1_of_2/output.css
+a {
+  b: hsla(var(--foo) 50%/0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/multi_argument_var/2_of_2/input.scss
+a {b: hsla(0 var(--foo) / 0.4)}
+
+<===> alpha/multi_argument_var/2_of_2/output.css
+a {
+  b: hsla(0 var(--foo)/0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/multi_argument_var/1_of_1/input.scss
+a {b: hsla(var(--foo) / 0.4)}
+
+<===> alpha/multi_argument_var/1_of_1/output.css
+a {
+  b: hsla(var(--foo)/0.4);
 }
diff --git a/spec/core_functions/color/hsla/three_args/basic.hrx b/spec/core_functions/color/hsla/three_args/basic.hrx
deleted file mode 100644
index 462f47878d..0000000000
--- a/spec/core_functions/color/hsla/three_args/basic.hrx
+++ /dev/null
@@ -1,635 +0,0 @@
-<===> input.scss
-// These test cases come from two official W3C test suites:
-//
-// * https://www.w3.org/Style/CSS/Test/CSS3/Color/20070927/html4/t040204-hsl-h-rotating-b.htm
-// * https://www.w3.org/Style/CSS/Test/CSS3/Color/current/html4/t040204-hsl-values-b.htm
-
-hue {
-  @mixin test-hues($name, $hues...) {
-    #{$name} {
-      @each $hue in $hues {
-        hue-#{$hue}: hsla($hue, 100%, 50%);
-      }
-    }
-  }
-
-  @include test-hues("red", 0, -360, 260, 6120);
-  @include test-hues("yellow", 60, -300, 420, -9660);
-  @include test-hues("green", 120, -240, 480, 99840);
-  @include test-hues("cyan", 180, -180, 540, -900);
-  @include test-hues("blue", 240, -120, 600, -104880);
-  @include test-hues("purple", 300, -60, 660, 2820);
-}
-
-red-to-green {
-  step-1: hsla(0, 100%, 50%);
-  step-2: hsla(12, 100%, 50%);
-  step-3: hsla(24, 100%, 50%);
-  step-4: hsla(36, 100%, 50%);
-  step-5: hsla(48, 100%, 50%);
-  step-6: hsla(60, 100%, 50%);
-  step-7: hsla(72, 100%, 50%);
-  step-8: hsla(84, 100%, 50%);
-  step-9: hsla(96, 100%, 50%);
-  step-10: hsla(108, 100%, 50%);
-  step-11: hsla(120, 100%, 50%);
-}
-
-green-to-blue {
-  step-1: hsla(120, 100%, 50%);
-  step-2: hsla(132, 100%, 50%);
-  step-3: hsla(144, 100%, 50%);
-  step-4: hsla(156, 100%, 50%);
-  step-5: hsla(168, 100%, 50%);
-  step-6: hsla(180, 100%, 50%);
-  step-7: hsla(192, 100%, 50%);
-  step-8: hsla(204, 100%, 50%);
-  step-9: hsla(216, 100%, 50%);
-  step-10: hsla(228, 100%, 50%);
-  step-11: hsla(240, 100%, 50%);
-}
-
-blue-to-red {
-  step-1: hsla(240, 100%, 50%);
-  step-2: hsla(252, 100%, 50%);
-  step-3: hsla(264, 100%, 50%);
-  step-4: hsla(276, 100%, 50%);
-  step-5: hsla(288, 100%, 50%);
-  step-6: hsla(300, 100%, 50%);
-  step-7: hsla(312, 100%, 50%);
-  step-8: hsla(324, 100%, 50%);
-  step-9: hsla(336, 100%, 50%);
-  step-10: hsla(348, 100%, 50%);
-  step-11: hsla(360, 100%, 50%);
-}
-
-gray-to {
-  red {
-    step-1: hsla(0, 20%, 50%);
-    step-2: hsla(0, 60%, 50%);
-    step-3: hsla(0, 100%, 50%);
-  }
-
-  yellow {
-    step-1: hsla(60, 20%, 50%);
-    step-2: hsla(60, 60%, 50%);
-    step-3: hsla(60, 100%, 50%);
-  }
-
-  green {
-    step-1: hsla(120, 20%, 50%);
-    step-2: hsla(120, 60%, 50%);
-    step-3: hsla(120, 100%, 50%);
-  }
-
-  cyan {
-    step-1: hsla(180, 20%, 50%);
-    step-2: hsla(180, 60%, 50%);
-    step-3: hsla(180, 100%, 50%);
-  }
-
-  blue {
-    step-1: hsla(240, 20%, 50%);
-    step-2: hsla(240, 60%, 50%);
-    step-3: hsla(240, 100%, 50%);
-  }
-
-  purple {
-    step-1: hsla(300, 20%, 50%);
-    step-2: hsla(300, 60%, 50%);
-    step-3: hsla(300, 100%, 50%);
-  }
-}
-
-black-to-white-through {
-  red {
-    step-1: hsla(0, 100%, 0%);
-    step-2: hsla(0, 100%, 10%);
-    step-3: hsla(0, 100%, 20%);
-    step-4: hsla(0, 100%, 30%);
-    step-5: hsla(0, 100%, 40%);
-    step-6: hsla(0, 100%, 50%);
-    step-7: hsla(0, 100%, 60%);
-    step-8: hsla(0, 100%, 70%);
-    step-9: hsla(0, 100%, 80%);
-    step-10: hsla(0, 100%, 90%);
-    step-11: hsla(0, 100%, 100%);
-  }
-
-  yellow {
-    step-1: hsla(60, 100%, 0%);
-    step-2: hsla(60, 100%, 10%);
-    step-3: hsla(60, 100%, 20%);
-    step-4: hsla(60, 100%, 30%);
-    step-5: hsla(60, 100%, 40%);
-    step-6: hsla(60, 100%, 50%);
-    step-7: hsla(60, 100%, 60%);
-    step-8: hsla(60, 100%, 70%);
-    step-9: hsla(60, 100%, 80%);
-    step-10: hsla(60, 100%, 90%);
-    step-11: hsla(60, 100%, 100%);
-  }
-
-  green {
-    step-1: hsla(120, 100%, 0%);
-    step-2: hsla(120, 100%, 10%);
-    step-3: hsla(120, 100%, 20%);
-    step-4: hsla(120, 100%, 30%);
-    step-5: hsla(120, 100%, 40%);
-    step-6: hsla(120, 100%, 50%);
-    step-7: hsla(120, 100%, 60%);
-    step-8: hsla(120, 100%, 70%);
-    step-9: hsla(120, 100%, 80%);
-    step-10: hsla(120, 100%, 90%);
-    step-11: hsla(120, 100%, 100%);
-  }
-
-  cyan {
-    step-1: hsla(180, 100%, 0%);
-    step-2: hsla(180, 100%, 10%);
-    step-3: hsla(180, 100%, 20%);
-    step-4: hsla(180, 100%, 30%);
-    step-5: hsla(180, 100%, 40%);
-    step-6: hsla(180, 100%, 50%);
-    step-7: hsla(180, 100%, 60%);
-    step-8: hsla(180, 100%, 70%);
-    step-9: hsla(180, 100%, 80%);
-    step-10: hsla(180, 100%, 90%);
-    step-11: hsla(180, 100%, 100%);
-  }
-
-  blue {
-    step-1: hsla(240, 100%, 0%);
-    step-2: hsla(240, 100%, 10%);
-    step-3: hsla(240, 100%, 20%);
-    step-4: hsla(240, 100%, 30%);
-    step-5: hsla(240, 100%, 40%);
-    step-6: hsla(240, 100%, 50%);
-    step-7: hsla(240, 100%, 60%);
-    step-8: hsla(240, 100%, 70%);
-    step-9: hsla(240, 100%, 80%);
-    step-10: hsla(240, 100%, 90%);
-    step-11: hsla(240, 100%, 100%);
-  }
-
-  purple {
-    step-1: hsla(300, 100%, 0%);
-    step-2: hsla(300, 100%, 10%);
-    step-3: hsla(300, 100%, 20%);
-    step-4: hsla(300, 100%, 30%);
-    step-5: hsla(300, 100%, 40%);
-    step-6: hsla(300, 100%, 50%);
-    step-7: hsla(300, 100%, 60%);
-    step-8: hsla(300, 100%, 70%);
-    step-9: hsla(300, 100%, 80%);
-    step-10: hsla(300, 100%, 90%);
-    step-11: hsla(300, 100%, 100%);
-  }
-}
-
-// The W3C tests cover clamped hue, but not clamped saturation or lightness.
-clamped {
-  saturation-above: hsla(0, 500%, 50%);
-  saturation-below: hsla(0, -100%, 50%);
-  lightness-above: hsla(0, 100%, 500%);
-  lightness-below: hsla(0, 100%, -100%);
-}
-
-units {
-  hue-deg: hsla(0deg, 100%, 50%);
-  saturation-unitless: hsla(0, 50, 50%);
-  lightness-unitless: hsla(0, 100%, 50);
-}
-
-named {
-  x: hsla($hue: 0, $saturation: 100%, $lightness: 50%);
-}
-
-<===> output.css
-hue red {
-  hue-0: red;
-  hue--360: red;
-  hue-260: #5500ff;
-  hue-6120: red;
-}
-hue yellow {
-  hue-60: yellow;
-  hue--300: yellow;
-  hue-420: yellow;
-  hue--9660: yellow;
-}
-hue green {
-  hue-120: lime;
-  hue--240: lime;
-  hue-480: lime;
-  hue-99840: lime;
-}
-hue cyan {
-  hue-180: aqua;
-  hue--180: aqua;
-  hue-540: aqua;
-  hue--900: aqua;
-}
-hue blue {
-  hue-240: blue;
-  hue--120: blue;
-  hue-600: blue;
-  hue--104880: blue;
-}
-hue purple {
-  hue-300: fuchsia;
-  hue--60: fuchsia;
-  hue-660: fuchsia;
-  hue-2820: fuchsia;
-}
-
-red-to-green {
-  step-1: red;
-  step-2: #ff3300;
-  step-3: #ff6600;
-  step-4: #ff9900;
-  step-5: #ffcc00;
-  step-6: yellow;
-  step-7: #ccff00;
-  step-8: #99ff00;
-  step-9: #66ff00;
-  step-10: #33ff00;
-  step-11: lime;
-}
-
-green-to-blue {
-  step-1: lime;
-  step-2: #00ff33;
-  step-3: #00ff66;
-  step-4: #00ff99;
-  step-5: #00ffcc;
-  step-6: aqua;
-  step-7: #00ccff;
-  step-8: #0099ff;
-  step-9: #0066ff;
-  step-10: #0033ff;
-  step-11: blue;
-}
-
-blue-to-red {
-  step-1: blue;
-  step-2: #3300ff;
-  step-3: #6600ff;
-  step-4: #9900ff;
-  step-5: #cc00ff;
-  step-6: fuchsia;
-  step-7: #ff00cc;
-  step-8: #ff0099;
-  step-9: #ff0066;
-  step-10: #ff0033;
-  step-11: red;
-}
-
-gray-to red {
-  step-1: #996666;
-  step-2: #cc3333;
-  step-3: red;
-}
-gray-to yellow {
-  step-1: #999966;
-  step-2: #cccc33;
-  step-3: yellow;
-}
-gray-to green {
-  step-1: #669966;
-  step-2: #33cc33;
-  step-3: lime;
-}
-gray-to cyan {
-  step-1: #669999;
-  step-2: #33cccc;
-  step-3: aqua;
-}
-gray-to blue {
-  step-1: #666699;
-  step-2: #3333cc;
-  step-3: blue;
-}
-gray-to purple {
-  step-1: #996699;
-  step-2: #cc33cc;
-  step-3: fuchsia;
-}
-
-black-to-white-through red {
-  step-1: black;
-  step-2: #330000;
-  step-3: #660000;
-  step-4: #990000;
-  step-5: #cc0000;
-  step-6: red;
-  step-7: #ff3333;
-  step-8: #ff6666;
-  step-9: #ff9999;
-  step-10: #ffcccc;
-  step-11: white;
-}
-black-to-white-through yellow {
-  step-1: black;
-  step-2: #333300;
-  step-3: #666600;
-  step-4: #999900;
-  step-5: #cccc00;
-  step-6: yellow;
-  step-7: #ffff33;
-  step-8: #ffff66;
-  step-9: #ffff99;
-  step-10: #ffffcc;
-  step-11: white;
-}
-black-to-white-through green {
-  step-1: black;
-  step-2: #003300;
-  step-3: #006600;
-  step-4: #009900;
-  step-5: #00cc00;
-  step-6: lime;
-  step-7: #33ff33;
-  step-8: #66ff66;
-  step-9: #99ff99;
-  step-10: #ccffcc;
-  step-11: white;
-}
-black-to-white-through cyan {
-  step-1: black;
-  step-2: #003333;
-  step-3: #006666;
-  step-4: #009999;
-  step-5: #00cccc;
-  step-6: aqua;
-  step-7: #33ffff;
-  step-8: #66ffff;
-  step-9: #99ffff;
-  step-10: #ccffff;
-  step-11: white;
-}
-black-to-white-through blue {
-  step-1: black;
-  step-2: #000033;
-  step-3: #000066;
-  step-4: #000099;
-  step-5: #0000cc;
-  step-6: blue;
-  step-7: #3333ff;
-  step-8: #6666ff;
-  step-9: #9999ff;
-  step-10: #ccccff;
-  step-11: white;
-}
-black-to-white-through purple {
-  step-1: black;
-  step-2: #330033;
-  step-3: #660066;
-  step-4: #990099;
-  step-5: #cc00cc;
-  step-6: fuchsia;
-  step-7: #ff33ff;
-  step-8: #ff66ff;
-  step-9: #ff99ff;
-  step-10: #ffccff;
-  step-11: white;
-}
-
-clamped {
-  saturation-above: red;
-  saturation-below: gray;
-  lightness-above: white;
-  lightness-below: black;
-}
-
-units {
-  hue-deg: red;
-  saturation-unitless: #bf4040;
-  lightness-unitless: red;
-}
-
-named {
-  x: red;
-}
-
-<===> output-libsass.css
-hue red {
-  hue-0: red;
-  hue--360: red;
-  hue-260: #5500ff;
-  hue-6120: red;
-}
-
-hue yellow {
-  hue-60: yellow;
-  hue--300: yellow;
-  hue-420: yellow;
-  hue--9660: yellow;
-}
-
-hue green {
-  hue-120: lime;
-  hue--240: lime;
-  hue-480: lime;
-  hue-99840: lime;
-}
-
-hue cyan {
-  hue-180: cyan;
-  hue--180: cyan;
-  hue-540: cyan;
-  hue--900: cyan;
-}
-
-hue blue {
-  hue-240: blue;
-  hue--120: blue;
-  hue-600: blue;
-  hue--104880: blue;
-}
-
-hue purple {
-  hue-300: magenta;
-  hue--60: magenta;
-  hue-660: magenta;
-  hue-2820: magenta;
-}
-
-red-to-green {
-  step-1: red;
-  step-2: #ff3300;
-  step-3: #ff6600;
-  step-4: #ff9900;
-  step-5: #ffcc00;
-  step-6: yellow;
-  step-7: #ccff00;
-  step-8: #99ff00;
-  step-9: #66ff00;
-  step-10: #33ff00;
-  step-11: lime;
-}
-
-green-to-blue {
-  step-1: lime;
-  step-2: #00ff33;
-  step-3: #00ff66;
-  step-4: #00ff99;
-  step-5: #00ffcc;
-  step-6: cyan;
-  step-7: #00ccff;
-  step-8: #0099ff;
-  step-9: #0066ff;
-  step-10: #0033ff;
-  step-11: blue;
-}
-
-blue-to-red {
-  step-1: blue;
-  step-2: #3300ff;
-  step-3: #6600ff;
-  step-4: #9900ff;
-  step-5: #cc00ff;
-  step-6: magenta;
-  step-7: #ff00cc;
-  step-8: #ff0099;
-  step-9: #ff0066;
-  step-10: #ff0033;
-  step-11: red;
-}
-
-gray-to red {
-  step-1: #996666;
-  step-2: #cc3333;
-  step-3: red;
-}
-
-gray-to yellow {
-  step-1: #999966;
-  step-2: #cccc33;
-  step-3: yellow;
-}
-
-gray-to green {
-  step-1: #669966;
-  step-2: #33cc33;
-  step-3: lime;
-}
-
-gray-to cyan {
-  step-1: #669999;
-  step-2: #33cccc;
-  step-3: cyan;
-}
-
-gray-to blue {
-  step-1: #666699;
-  step-2: #3333cc;
-  step-3: blue;
-}
-
-gray-to purple {
-  step-1: #996699;
-  step-2: #cc33cc;
-  step-3: magenta;
-}
-
-black-to-white-through red {
-  step-1: black;
-  step-2: #330000;
-  step-3: #660000;
-  step-4: #990000;
-  step-5: #cc0000;
-  step-6: red;
-  step-7: #ff3333;
-  step-8: #ff6666;
-  step-9: #ff9999;
-  step-10: #ffcccc;
-  step-11: white;
-}
-
-black-to-white-through yellow {
-  step-1: black;
-  step-2: #333300;
-  step-3: #666600;
-  step-4: #999900;
-  step-5: #cccc00;
-  step-6: yellow;
-  step-7: #ffff33;
-  step-8: #ffff66;
-  step-9: #ffff99;
-  step-10: #ffffcc;
-  step-11: white;
-}
-
-black-to-white-through green {
-  step-1: black;
-  step-2: #003300;
-  step-3: #006600;
-  step-4: #009900;
-  step-5: #00cc00;
-  step-6: lime;
-  step-7: #33ff33;
-  step-8: #66ff66;
-  step-9: #99ff99;
-  step-10: #ccffcc;
-  step-11: white;
-}
-
-black-to-white-through cyan {
-  step-1: black;
-  step-2: #003333;
-  step-3: #006666;
-  step-4: #009999;
-  step-5: #00cccc;
-  step-6: cyan;
-  step-7: #33ffff;
-  step-8: #66ffff;
-  step-9: #99ffff;
-  step-10: #ccffff;
-  step-11: white;
-}
-
-black-to-white-through blue {
-  step-1: black;
-  step-2: #000033;
-  step-3: #000066;
-  step-4: #000099;
-  step-5: #0000cc;
-  step-6: blue;
-  step-7: #3333ff;
-  step-8: #6666ff;
-  step-9: #9999ff;
-  step-10: #ccccff;
-  step-11: white;
-}
-
-black-to-white-through purple {
-  step-1: black;
-  step-2: #330033;
-  step-3: #660066;
-  step-4: #990099;
-  step-5: #cc00cc;
-  step-6: magenta;
-  step-7: #ff33ff;
-  step-8: #ff66ff;
-  step-9: #ff99ff;
-  step-10: #ffccff;
-  step-11: white;
-}
-
-clamped {
-  saturation-above: red;
-  saturation-below: gray;
-  lightness-above: white;
-  lightness-below: black;
-}
-
-units {
-  hue-deg: red;
-  saturation-unitless: #bf4040;
-  lightness-unitless: red;
-}
-
-named {
-  x: red;
-}
diff --git a/spec/core_functions/color/hsla/three_args/clamped.hrx b/spec/core_functions/color/hsla/three_args/clamped.hrx
new file mode 100644
index 0000000000..dc638d6820
--- /dev/null
+++ b/spec/core_functions/color/hsla/three_args/clamped.hrx
@@ -0,0 +1,42 @@
+<===> README.md
+The W3C tests cover clamped hue, but not clamped saturation or lightness.
+
+<===>
+================================================================================
+<===> saturation/above/input.scss
+a {b: hsla(0, 500%, 50%)}
+
+<===> saturation/above/output.css
+a {
+  b: red;
+}
+
+<===>
+================================================================================
+<===> saturation/below/input.scss
+a {b: hsla(0, -100%, 50%)}
+
+<===> saturation/below/output.css
+a {
+  b: gray;
+}
+
+<===>
+================================================================================
+<===> lightness/above/input.scss
+a {b: hsla(0, 100%, 500%)}
+
+<===> lightness/above/output.css
+a {
+  b: white;
+}
+
+<===>
+================================================================================
+<===> lightness/below/input.scss
+a {b: hsla(0, 100%, -100%)}
+
+<===> lightness/below/output.css
+a {
+  b: black;
+}
diff --git a/spec/core_functions/color/hsla/three_args/named.hrx b/spec/core_functions/color/hsla/three_args/named.hrx
new file mode 100644
index 0000000000..33d0fa15ab
--- /dev/null
+++ b/spec/core_functions/color/hsla/three_args/named.hrx
@@ -0,0 +1,10 @@
+<===>
+================================================================================
+<===> input.scss
+a {b: hsla($hue: 0, $saturation: 100%, $lightness: 50%)}
+
+<===> output.css
+a {
+  b: red;
+}
+
diff --git a/spec/core_functions/color/hsla/three_args/options.yml b/spec/core_functions/color/hsla/three_args/options.yml
index 076f9d2d59..018b0da451 100644
--- a/spec/core_functions/color/hsla/three_args/options.yml
+++ b/spec/core_functions/color/hsla/three_args/options.yml
@@ -1,3 +1,3 @@
 ---
 :todo:
-- libsass # sass/libsass#2722
+- sass/libsass#2722
diff --git a/spec/core_functions/color/hsla/three_args/special_functions.hrx b/spec/core_functions/color/hsla/three_args/special_functions.hrx
index 0952fb483c..fb5ea518dc 100644
--- a/spec/core_functions/color/hsla/three_args/special_functions.hrx
+++ b/spec/core_functions/color/hsla/three_args/special_functions.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2726
+- sass/libsass#2726
 
 <===> input.scss
 a {
diff --git a/spec/core_functions/color/hsla/three_args/units.hrx b/spec/core_functions/color/hsla/three_args/units.hrx
new file mode 100644
index 0000000000..72dd178790
--- /dev/null
+++ b/spec/core_functions/color/hsla/three_args/units.hrx
@@ -0,0 +1,29 @@
+<===>
+================================================================================
+<===> hue/deg/input.scss
+a {b: hsla(0deg, 100%, 50%)}
+
+<===> hue/deg/output.css
+a {
+  b: red;
+}
+
+<===>
+================================================================================
+<===> saturation/unitless/input.scss
+a {b: hsla(0, 50, 50%)}
+
+<===> saturation/unitless/output.css
+a {
+  b: #bf4040;
+}
+
+<===>
+================================================================================
+<===> lightness/unitless/input.scss
+a {b: hsla(0, 100%, 50)}
+
+<===> lightness/unitless/output.css
+a {
+  b: red;
+}
diff --git a/spec/core_functions/color/hsla/three_args/w3c.hrx b/spec/core_functions/color/hsla/three_args/w3c.hrx
new file mode 100644
index 0000000000..b188635710
--- /dev/null
+++ b/spec/core_functions/color/hsla/three_args/w3c.hrx
@@ -0,0 +1,454 @@
+<===> README.md
+These test cases come from two official W3C test suites:
+
+* https://www.w3.org/Style/CSS/Test/CSS3/Color/20070927/html4/t040204-hsl-h-rotating-b.htm
+* https://www.w3.org/Style/CSS/Test/CSS3/Color/current/html4/t040204-hsl-values-b.htm
+
+Because these spces have so many repetitive cases, they violate the normal
+one-test-case-per-suite rule.
+
+<===>
+================================================================================
+<===> hue/input.scss
+@mixin test-hues($name, $hues...) {
+  #{$name} {
+    @each $hue in $hues {
+      hue-#{$hue}: hsla($hue, 100%, 50%);
+    }
+  }
+}
+
+@include test-hues("red", 0, -360, 360, 6120);
+@include test-hues("yellow", 60, -300, 420, -9660);
+@include test-hues("green", 120, -240, 480, 99840);
+@include test-hues("cyan", 180, -180, 540, -900);
+@include test-hues("blue", 240, -120, 600, -104880);
+@include test-hues("purple", 300, -60, 660, 2820);
+
+<===> hue/output.css
+red {
+  hue-0: red;
+  hue--360: red;
+  hue-360: red;
+  hue-6120: red;
+}
+
+yellow {
+  hue-60: yellow;
+  hue--300: yellow;
+  hue-420: yellow;
+  hue--9660: yellow;
+}
+
+green {
+  hue-120: lime;
+  hue--240: lime;
+  hue-480: lime;
+  hue-99840: lime;
+}
+
+cyan {
+  hue-180: aqua;
+  hue--180: aqua;
+  hue-540: aqua;
+  hue--900: aqua;
+}
+
+blue {
+  hue-240: blue;
+  hue--120: blue;
+  hue-600: blue;
+  hue--104880: blue;
+}
+
+purple {
+  hue-300: fuchsia;
+  hue--60: fuchsia;
+  hue-660: fuchsia;
+  hue-2820: fuchsia;
+}
+
+<===>
+================================================================================
+<===> red_to_green/input.scss
+a {
+  step-1: hsla(0, 100%, 50%);
+  step-2: hsla(12, 100%, 50%);
+  step-3: hsla(24, 100%, 50%);
+  step-4: hsla(36, 100%, 50%);
+  step-5: hsla(48, 100%, 50%);
+  step-6: hsla(60, 100%, 50%);
+  step-7: hsla(72, 100%, 50%);
+  step-8: hsla(84, 100%, 50%);
+  step-9: hsla(96, 100%, 50%);
+  step-10: hsla(108, 100%, 50%);
+  step-11: hsla(120, 100%, 50%);
+}
+
+<===> red_to_green/output.css
+a {
+  step-1: red;
+  step-2: #ff3300;
+  step-3: #ff6600;
+  step-4: #ff9900;
+  step-5: #ffcc00;
+  step-6: yellow;
+  step-7: #ccff00;
+  step-8: #99ff00;
+  step-9: #66ff00;
+  step-10: #33ff00;
+  step-11: lime;
+}
+
+<===>
+================================================================================
+<===> green_to_blue/input.scss
+a {
+  step-1: hsla(120, 100%, 50%);
+  step-2: hsla(132, 100%, 50%);
+  step-3: hsla(144, 100%, 50%);
+  step-4: hsla(156, 100%, 50%);
+  step-5: hsla(168, 100%, 50%);
+  step-6: hsla(180, 100%, 50%);
+  step-7: hsla(192, 100%, 50%);
+  step-8: hsla(204, 100%, 50%);
+  step-9: hsla(216, 100%, 50%);
+  step-10: hsla(228, 100%, 50%);
+  step-11: hsla(240, 100%, 50%);
+}
+
+<===> green_to_blue/output.css
+a {
+  step-1: lime;
+  step-2: #00ff33;
+  step-3: #00ff66;
+  step-4: #00ff99;
+  step-5: #00ffcc;
+  step-6: aqua;
+  step-7: #00ccff;
+  step-8: #0099ff;
+  step-9: #0066ff;
+  step-10: #0033ff;
+  step-11: blue;
+}
+
+<===>
+================================================================================
+<===> blue_to_red/input.scss
+a {
+  step-1: hsla(240, 100%, 50%);
+  step-2: hsla(252, 100%, 50%);
+  step-3: hsla(264, 100%, 50%);
+  step-4: hsla(276, 100%, 50%);
+  step-5: hsla(288, 100%, 50%);
+  step-6: hsla(300, 100%, 50%);
+  step-7: hsla(312, 100%, 50%);
+  step-8: hsla(324, 100%, 50%);
+  step-9: hsla(336, 100%, 50%);
+  step-10: hsla(348, 100%, 50%);
+  step-11: hsla(360, 100%, 50%);
+}
+
+<===> blue_to_red/output.css
+a {
+  step-1: blue;
+  step-2: #3300ff;
+  step-3: #6600ff;
+  step-4: #9900ff;
+  step-5: #cc00ff;
+  step-6: fuchsia;
+  step-7: #ff00cc;
+  step-8: #ff0099;
+  step-9: #ff0066;
+  step-10: #ff0033;
+  step-11: red;
+}
+
+<===>
+================================================================================
+<===> gray_to/red/input.scss
+a {
+  step-1: hsla(0, 20%, 50%);
+  step-2: hsla(0, 60%, 50%);
+  step-3: hsla(0, 100%, 50%);
+}
+
+<===> gray_to/red/output.css
+a {
+  step-1: #996666;
+  step-2: #cc3333;
+  step-3: red;
+}
+
+<===>
+================================================================================
+<===> gray_to/yellow/input.scss
+a {
+  step-1: hsla(60, 20%, 50%);
+  step-2: hsla(60, 60%, 50%);
+  step-3: hsla(60, 100%, 50%);
+}
+
+<===> gray_to/yellow/output.css
+a {
+  step-1: #999966;
+  step-2: #cccc33;
+  step-3: yellow;
+}
+
+<===>
+================================================================================
+<===> gray_to/green/input.scss
+a {
+  step-1: hsla(120, 20%, 50%);
+  step-2: hsla(120, 60%, 50%);
+  step-3: hsla(120, 100%, 50%);
+}
+
+<===> gray_to/green/output.css
+a {
+  step-1: #669966;
+  step-2: #33cc33;
+  step-3: lime;
+}
+
+<===>
+================================================================================
+<===> gray_to/cyan/input.scss
+a {
+  step-1: hsla(180, 20%, 50%);
+  step-2: hsla(180, 60%, 50%);
+  step-3: hsla(180, 100%, 50%);
+}
+
+<===> gray_to/cyan/output.css
+a {
+  step-1: #669999;
+  step-2: #33cccc;
+  step-3: aqua;
+}
+
+<===>
+================================================================================
+<===> gray_to/blue/input.scss
+a {
+  step-1: hsla(240, 20%, 50%);
+  step-2: hsla(240, 60%, 50%);
+  step-3: hsla(240, 100%, 50%);
+}
+
+<===> gray_to/blue/output.css
+a {
+  step-1: #666699;
+  step-2: #3333cc;
+  step-3: blue;
+}
+
+<===>
+================================================================================
+<===> gray_to/purple/input.scss
+a {
+  step-1: hsla(300, 20%, 50%);
+  step-2: hsla(300, 60%, 50%);
+  step-3: hsla(300, 100%, 50%);
+}
+
+<===> gray_to/purple/output.css
+a {
+  step-1: #996699;
+  step-2: #cc33cc;
+  step-3: fuchsia;
+}
+
+<===>
+================================================================================
+<===> black_to_white_through/red/input.scss
+a {
+  step-1: hsla(0, 100%, 0%);
+  step-2: hsla(0, 100%, 10%);
+  step-3: hsla(0, 100%, 20%);
+  step-4: hsla(0, 100%, 30%);
+  step-5: hsla(0, 100%, 40%);
+  step-6: hsla(0, 100%, 50%);
+  step-7: hsla(0, 100%, 60%);
+  step-8: hsla(0, 100%, 70%);
+  step-9: hsla(0, 100%, 80%);
+  step-10: hsla(0, 100%, 90%);
+  step-11: hsla(0, 100%, 100%);
+}
+
+<===> black_to_white_through/red/output.css
+a {
+  step-1: black;
+  step-2: #330000;
+  step-3: #660000;
+  step-4: #990000;
+  step-5: #cc0000;
+  step-6: red;
+  step-7: #ff3333;
+  step-8: #ff6666;
+  step-9: #ff9999;
+  step-10: #ffcccc;
+  step-11: white;
+}
+
+<===>
+================================================================================
+<===> black_to_white_through/yellow/input.scss
+a {
+  step-1: hsla(60, 100%, 0%);
+  step-2: hsla(60, 100%, 10%);
+  step-3: hsla(60, 100%, 20%);
+  step-4: hsla(60, 100%, 30%);
+  step-5: hsla(60, 100%, 40%);
+  step-6: hsla(60, 100%, 50%);
+  step-7: hsla(60, 100%, 60%);
+  step-8: hsla(60, 100%, 70%);
+  step-9: hsla(60, 100%, 80%);
+  step-10: hsla(60, 100%, 90%);
+  step-11: hsla(60, 100%, 100%);
+}
+
+<===> black_to_white_through/yellow/output.css
+a {
+  step-1: black;
+  step-2: #333300;
+  step-3: #666600;
+  step-4: #999900;
+  step-5: #cccc00;
+  step-6: yellow;
+  step-7: #ffff33;
+  step-8: #ffff66;
+  step-9: #ffff99;
+  step-10: #ffffcc;
+  step-11: white;
+}
+
+<===>
+================================================================================
+<===> black_to_white_through/green/input.scss
+a {
+  step-1: hsla(120, 100%, 0%);
+  step-2: hsla(120, 100%, 10%);
+  step-3: hsla(120, 100%, 20%);
+  step-4: hsla(120, 100%, 30%);
+  step-5: hsla(120, 100%, 40%);
+  step-6: hsla(120, 100%, 50%);
+  step-7: hsla(120, 100%, 60%);
+  step-8: hsla(120, 100%, 70%);
+  step-9: hsla(120, 100%, 80%);
+  step-10: hsla(120, 100%, 90%);
+  step-11: hsla(120, 100%, 100%);
+}
+
+<===> black_to_white_through/green/output.css
+a {
+  step-1: black;
+  step-2: #003300;
+  step-3: #006600;
+  step-4: #009900;
+  step-5: #00cc00;
+  step-6: lime;
+  step-7: #33ff33;
+  step-8: #66ff66;
+  step-9: #99ff99;
+  step-10: #ccffcc;
+  step-11: white;
+}
+
+<===>
+================================================================================
+<===> black_to_white_through/cyan/input.scss
+a {
+  step-1: hsla(180, 100%, 0%);
+  step-2: hsla(180, 100%, 10%);
+  step-3: hsla(180, 100%, 20%);
+  step-4: hsla(180, 100%, 30%);
+  step-5: hsla(180, 100%, 40%);
+  step-6: hsla(180, 100%, 50%);
+  step-7: hsla(180, 100%, 60%);
+  step-8: hsla(180, 100%, 70%);
+  step-9: hsla(180, 100%, 80%);
+  step-10: hsla(180, 100%, 90%);
+  step-11: hsla(180, 100%, 100%);
+}
+
+<===> black_to_white_through/cyan/output.css
+a {
+  step-1: black;
+  step-2: #003333;
+  step-3: #006666;
+  step-4: #009999;
+  step-5: #00cccc;
+  step-6: aqua;
+  step-7: #33ffff;
+  step-8: #66ffff;
+  step-9: #99ffff;
+  step-10: #ccffff;
+  step-11: white;
+}
+
+<===>
+================================================================================
+<===> black_to_white_through/blue/input.scss
+a {
+  step-1: hsla(240, 100%, 0%);
+  step-2: hsla(240, 100%, 10%);
+  step-3: hsla(240, 100%, 20%);
+  step-4: hsla(240, 100%, 30%);
+  step-5: hsla(240, 100%, 40%);
+  step-6: hsla(240, 100%, 50%);
+  step-7: hsla(240, 100%, 60%);
+  step-8: hsla(240, 100%, 70%);
+  step-9: hsla(240, 100%, 80%);
+  step-10: hsla(240, 100%, 90%);
+  step-11: hsla(240, 100%, 100%);
+}
+
+<===> black_to_white_through/blue/output.css
+a {
+  step-1: black;
+  step-2: #000033;
+  step-3: #000066;
+  step-4: #000099;
+  step-5: #0000cc;
+  step-6: blue;
+  step-7: #3333ff;
+  step-8: #6666ff;
+  step-9: #9999ff;
+  step-10: #ccccff;
+  step-11: white;
+}
+
+<===>
+================================================================================
+<===> black_to_white_through/purple/input.scss
+a {
+  step-1: hsla(300, 100%, 0%);
+  step-2: hsla(300, 100%, 10%);
+  step-3: hsla(300, 100%, 20%);
+  step-4: hsla(300, 100%, 30%);
+  step-5: hsla(300, 100%, 40%);
+  step-6: hsla(300, 100%, 50%);
+  step-7: hsla(300, 100%, 60%);
+  step-8: hsla(300, 100%, 70%);
+  step-9: hsla(300, 100%, 80%);
+  step-10: hsla(300, 100%, 90%);
+  step-11: hsla(300, 100%, 100%);
+}
+
+<===> black_to_white_through/purple/output.css
+a {
+  step-1: black;
+  step-2: #330033;
+  step-3: #660066;
+  step-4: #990099;
+  step-5: #cc00cc;
+  step-6: fuchsia;
+  step-7: #ff33ff;
+  step-8: #ff66ff;
+  step-9: #ff99ff;
+  step-10: #ffccff;
+  step-11: white;
+}
+
diff --git a/spec/core_functions/color/hsla/two_args.hrx b/spec/core_functions/color/hsla/two_args.hrx
deleted file mode 100644
index cc2e3b48d7..0000000000
--- a/spec/core_functions/color/hsla/two_args.hrx
+++ /dev/null
@@ -1,43 +0,0 @@
-<===> input.scss
-opaque-to {
-  opaque: hsla(#123, 1);
-  partial: hsla(#123, 0.5);
-  transparent: hsla(#123, 0);
-}
-
-partial-to {
-  $color: hsla(0, 0, 255, 0.3);
-  opaque: hsla($color, 1);
-  partial: hsla($color, 0.5);
-  transparent: hsla($color, 0);
-}
-
-transparent-to {
-  opaque: hsla(transparent, 1);
-  partial: hsla(transparent, 0.5);
-  transparent: hsla(transparent, 0);
-}
-
-clamped {
-  opaque: hsla(#123, 1.1);
-  transparent: hsla(#123, -0.1);
-}
-
-named {
-  x: hsla($color: #123, $alpha: 0.5);
-}
-
-<===> error
-Error: Missing argument $lightness.
-  ,
-2 |   opaque: hsla(#123, 1);
-  |           ^^^^^^^^^^^^^
-  '
-  input.scss 2:11  root stylesheet
-
-<===> error-libsass
-Error: Function hsla is missing argument $lightness.
-        on line 2 of /sass/spec/core_functions/color/hsla/with_color/input.scss
->>   opaque: hsla(#123, 1);
-
-   ----------^
diff --git a/spec/core_functions/color/hue.hrx b/spec/core_functions/color/hue.hrx
new file mode 100644
index 0000000000..3c890ef071
--- /dev/null
+++ b/spec/core_functions/color/hue.hrx
@@ -0,0 +1,128 @@
+<===> max/input.scss
+a {b: hue(hsl(359, 100%, 100%))}
+
+<===> max/output.css
+a {
+  b: 359deg;
+}
+
+<===>
+================================================================================
+<===> above_max/input.scss
+a {b: hue(hsl(540, 100%, 100%))}
+
+<===> above_max/output.css
+a {
+  b: 180deg;
+}
+
+<===>
+================================================================================
+<===> min/input.scss
+a {b: hue(hsl(0, 100%, 100%))}
+
+<===> min/output.css
+a {
+  b: 0deg;
+}
+
+<===>
+================================================================================
+<===> negative/input.scss
+a {b: hue(hsl(-180, 100%, 100%))}
+
+<===> negative/output.css
+a {
+  b: 180deg;
+}
+
+<===>
+================================================================================
+<===> middle/input.scss
+a {b: hue(hsl(123, 100%, 100%))}
+
+<===> middle/output.css
+a {
+  b: 123deg;
+}
+
+<===>
+================================================================================
+<===> fraction/input.scss
+a {b: hue(hsl(0.5, 100%, 100%))}
+
+<===> fraction/output.css
+a {
+  b: 0.5deg;
+}
+
+<===>
+================================================================================
+<===> named/input.scss
+a {b: hue($color: hsl(234, 100%, 100%))}
+
+<===> named/output.css
+a {
+  b: 234deg;
+}
+
+<===>
+================================================================================
+<===> error/too_few_args/input.scss
+a {b: hue()}
+
+<===> error/too_few_args/error
+Error: Missing argument $color.
+  ,
+1 | a {b: hue()}
+  |       ^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_few_args/error-libsass
+Error: Function hue is missing argument $color.
+        on line 1 of input.scss
+>> a {b: hue()}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/too_many_args/input.scss
+a {b: hue(red, green)}
+
+<===> error/too_many_args/error
+Error: Only 1 argument allowed, but 2 were passed.
+  ,
+1 | a {b: hue(red, green)}
+  |       ^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_many_args/error-libsass
+Error: wrong number of arguments (2 for 1) for `hue'
+        on line 1:7 of input.scss
+>> a {b: hue(red, green)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/type/input.scss
+a {b: hue(1)}
+
+<===> error/type/error
+Error: $color: 1 is not a color.
+  ,
+1 | a {b: hue(1)}
+  |       ^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/type/error-libsass
+Error: argument `$color` of `hue($color)` must be a color
+        on line 1:7 of input.scss, in function `hue`
+        from line 1:7 of input.scss
+>> a {b: hue(1)}
+
+   ------^
diff --git a/spec/core_functions/color/invert.hrx b/spec/core_functions/color/invert.hrx
new file mode 100644
index 0000000000..b2da723556
--- /dev/null
+++ b/spec/core_functions/color/invert.hrx
@@ -0,0 +1,259 @@
+<===> white/input.scss
+a {b: invert(white)}
+
+<===> white/output.css
+a {
+  b: black;
+}
+
+<===>
+================================================================================
+<===> black/input.scss
+a {b: invert(black)}
+
+<===> black/output.css
+a {
+  b: white;
+}
+
+<===>
+================================================================================
+<===> gray/input.scss
+a {b: invert(gray)}
+
+<===> gray/output.css
+a {
+  b: #7f7f7f;
+}
+
+<===>
+================================================================================
+<===> turquoise/input.scss
+a {b: invert(turquoise)}
+
+<===> turquoise/output.css
+a {
+  b: #bf1f2f;
+}
+
+<===>
+================================================================================
+<===> weighted/min/input.scss
+a {b: invert(turquoise, 0%)}
+
+<===> weighted/min/output.css
+a {
+  b: turquoise;
+}
+
+<===>
+================================================================================
+<===> weighted/max/input.scss
+a {b: invert(turquoise, 100%)}
+
+<===> weighted/max/output.css
+a {
+  b: #bf1f2f;
+}
+
+<===>
+================================================================================
+<===> weighted/middle/options.yml
+---
+:todo:
+- sass/dart-sass#704
+
+<===> weighted/middle/input.scss
+a {b: invert(turquoise, 50%)}
+
+<===> weighted/middle/output.css
+a {
+  b: gray;
+}
+
+<===>
+================================================================================
+<===> weighted/low/input.scss
+a {b: invert(turquoise, 23%)}
+
+<===> weighted/low/output.css
+a {
+  b: #5db4ab;
+}
+
+<===>
+================================================================================
+<===> weighted/high/input.scss
+a {b: invert(turquoise, 92%)}
+
+<===> weighted/high/output.css
+a {
+  b: #b52e3c;
+}
+
+<===>
+================================================================================
+<===> alpha/input.scss
+a {b: invert(rgba(turquoise, 0.4))}
+
+<===> alpha/output.css
+a {
+  b: rgba(191, 31, 47, 0.4);
+}
+
+<===>
+================================================================================
+<===> number/input.scss
+a {b: invert(10%)}
+
+<===> number/output.css
+a {
+  b: invert(10%);
+}
+
+<===>
+================================================================================
+<===> named/input.scss
+a {b: invert($color: turquoise, $weight: 0%)}
+
+<===> named/output.css
+a {
+  b: turquoise;
+}
+
+<===>
+================================================================================
+<===> error/too_few_args/input.scss
+a {b: invert()}
+
+<===> error/too_few_args/error
+Error: Missing argument $color.
+  ,
+1 | a {b: invert()}
+  |       ^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_few_args/error-libsass
+Error: Function invert is missing argument $color.
+        on line 1 of input.scss
+>> a {b: invert()}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/too_many_args/input.scss
+a {b: invert(turquoise, 0%, 1)}
+
+<===> error/too_many_args/error
+Error: Only 2 arguments allowed, but 3 were passed.
+  ,
+1 | a {b: invert(turquoise, 0%, 1)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_many_args/error-libsass
+Error: wrong number of arguments (3 for 2) for `invert'
+        on line 1:7 of input.scss
+>> a {b: invert(turquoise, 0%, 1)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/number_with_weight/options.yml
+---
+:todo:
+- sass/dart-sass#705
+- sass/libsass#2899
+
+<===> error/number_with_weight/input.scss
+a {b: invert(1, 50%)}
+
+<===> error/number_with_weight/error
+
+<===>
+================================================================================
+<===> error/type/color/input.scss
+a {b: invert(c)}
+
+<===> error/type/color/error
+Error: $color: c is not a color.
+  ,
+1 | a {b: invert(c)}
+  |       ^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/type/color/error-libsass
+Error: argument `$color` of `invert($color, $weight: 100%)` must be a color
+        on line 1:7 of input.scss, in function `invert`
+        from line 1:7 of input.scss
+>> a {b: invert(c)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/type/weight/input.scss
+a {b: invert(red, c)}
+
+<===> error/type/weight/error
+Error: $weight: c is not a number.
+  ,
+1 | a {b: invert(red, c)}
+  |       ^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/type/weight/error-libsass
+Error: argument `$weight` of `invert($color, $weight: 100%)` must be a number
+        on line 1:7 of input.scss, in function `invert`
+        from line 1:7 of input.scss
+>> a {b: invert(red, c)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/bounds/too_low/input.scss
+a {b: invert(red, -0.001)}
+
+<===> error/bounds/too_low/error
+Error: Expected -0.001 to be within 0 and 100.
+  ,
+1 | a {b: invert(red, -0.001)}
+  |       ^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/bounds/too_low/error-libsass
+Error: argument `$weight` of `invert($color, $weight: 100%)` must be between -0 and 100
+        on line 1:7 of input.scss, in function `invert`
+        from line 1:7 of input.scss
+>> a {b: invert(red, -0.001)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/bounds/too_high/input.scss
+a {b: invert(red, 100.001)}
+
+<===> error/bounds/too_high/error
+Error: Expected 100.001 to be within 0 and 100.
+  ,
+1 | a {b: invert(red, 100.001)}
+  |       ^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/bounds/too_high/error-libsass
+Error: argument `$weight` of `invert($color, $weight: 100%)` must be between -0 and 100
+        on line 1:7 of input.scss, in function `invert`
+        from line 1:7 of input.scss
+>> a {b: invert(red, 100.001)}
+
+   ------^
diff --git a/spec/core_functions/color/lighten.hrx b/spec/core_functions/color/lighten.hrx
new file mode 100644
index 0000000000..816ab407bd
--- /dev/null
+++ b/spec/core_functions/color/lighten.hrx
@@ -0,0 +1,191 @@
+<===> max/input.scss
+a {b: lighten(red, 100%)}
+
+<===> max/output.css
+a {
+  b: white;
+}
+
+<===>
+================================================================================
+<===> max_remaining/input.scss
+a {b: lighten(red, 50%)}
+
+<===> max_remaining/output.css
+a {
+  b: white;
+}
+
+<===>
+================================================================================
+<===> min/input.scss
+a {b: lighten(red, 0%)}
+
+<===> min/output.css
+a {
+  b: red;
+}
+
+<===>
+================================================================================
+<===> middle/input.scss
+a {b: lighten(red, 14%)}
+
+<===> middle/output.css
+a {
+  b: #ff4747;
+}
+
+<===>
+================================================================================
+<===> fraction/input.scss
+a {b: lighten(red, 0.5%)}
+
+<===> fraction/output.css
+a {
+  b: #ff0303;
+}
+
+<===>
+================================================================================
+<===> alpha/input.scss
+a {b: lighten(rgba(red, 0.4), 100%)}
+
+<===> alpha/output.css
+a {
+  b: rgba(255, 255, 255, 0.4);
+}
+
+<===>
+================================================================================
+<===> named/input.scss
+a {b: lighten($color: red, $amount: 14%)}
+
+<===> named/output.css
+a {
+  b: #ff4747;
+}
+
+<===>
+================================================================================
+<===> error/too_few_args/input.scss
+a {b: lighten(red)}
+
+<===> error/too_few_args/error
+Error: Missing argument $amount.
+  ,
+1 | a {b: lighten(red)}
+  |       ^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_few_args/error-libsass
+Error: Function lighten is missing argument $amount.
+        on line 1 of input.scss
+>> a {b: lighten(red)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/too_many_args/input.scss
+a {b: lighten(red, 1%, 2)}
+
+<===> error/too_many_args/error
+Error: Only 2 arguments allowed, but 3 were passed.
+  ,
+1 | a {b: lighten(red, 1%, 2)}
+  |       ^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_many_args/error-libsass
+Error: wrong number of arguments (3 for 2) for `lighten'
+        on line 1:7 of input.scss
+>> a {b: lighten(red, 1%, 2)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/type/color/input.scss
+a {b: lighten(1, 2)}
+
+<===> error/type/color/error
+Error: $color: 1 is not a color.
+  ,
+1 | a {b: lighten(1, 2)}
+  |       ^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/type/color/error-libsass
+Error: argument `$color` of `lighten($color, $amount)` must be a color
+        on line 1:7 of input.scss, in function `lighten`
+        from line 1:7 of input.scss
+>> a {b: lighten(1, 2)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/type/lightness/input.scss
+a {b: lighten(red, blue)}
+
+<===> error/type/lightness/error
+Error: $amount: blue is not a number.
+  ,
+1 | a {b: lighten(red, blue)}
+  |       ^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/type/lightness/error-libsass
+Error: argument `$amount` of `lighten($color, $amount)` must be a number
+        on line 1:7 of input.scss, in function `lighten`
+        from line 1:7 of input.scss
+>> a {b: lighten(red, blue)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/bounds/too_low/input.scss
+a {b: lighten(red, -0.001)}
+
+<===> error/bounds/too_low/error
+Error: Expected -0.001 to be within 0 and 100.
+  ,
+1 | a {b: lighten(red, -0.001)}
+  |       ^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/bounds/too_low/error-libsass
+Error: argument `$amount` of `lighten($color, $amount)` must be between -0 and 100
+        on line 1:7 of input.scss, in function `lighten`
+        from line 1:7 of input.scss
+>> a {b: lighten(red, -0.001)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/bounds/too_high/input.scss
+a {b: lighten(red, 100.001)}
+
+<===> error/bounds/too_high/error
+Error: Expected 100.001 to be within 0 and 100.
+  ,
+1 | a {b: lighten(red, 100.001)}
+  |       ^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/bounds/too_high/error-libsass
+Error: argument `$amount` of `lighten($color, $amount)` must be between -0 and 100
+        on line 1:7 of input.scss, in function `lighten`
+        from line 1:7 of input.scss
+>> a {b: lighten(red, 100.001)}
+
+   ------^
diff --git a/spec/core_functions/color/lightness.hrx b/spec/core_functions/color/lightness.hrx
new file mode 100644
index 0000000000..d6958a8c3c
--- /dev/null
+++ b/spec/core_functions/color/lightness.hrx
@@ -0,0 +1,108 @@
+<===> max/input.scss
+a {b: lightness(hsl(0, 100%, 100%))}
+
+<===> max/output.css
+a {
+  b: 100%;
+}
+
+<===>
+================================================================================
+<===> min/input.scss
+a {b: lightness(hsl(0, 100%, 0%))}
+
+<===> min/output.css
+a {
+  b: 0%;
+}
+
+<===>
+================================================================================
+<===> middle/input.scss
+a {b: lightness(hsl(0, 100%, 50%))}
+
+<===> middle/output.css
+a {
+  b: 50%;
+}
+
+<===>
+================================================================================
+<===> fraction/input.scss
+a {b: lightness(hsl(0, 100%, 0.5%))}
+
+<===> fraction/output.css
+a {
+  b: 0.5%;
+}
+
+<===>
+================================================================================
+<===> named/input.scss
+a {b: lightness($color: hsl(0, 100%, 42%))}
+
+<===> named/output.css
+a {
+  b: 42%;
+}
+
+<===>
+================================================================================
+<===> error/too_few_args/input.scss
+a {b: lightness()}
+
+<===> error/too_few_args/error
+Error: Missing argument $color.
+  ,
+1 | a {b: lightness()}
+  |       ^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_few_args/error-libsass
+Error: Function lightness is missing argument $color.
+        on line 1 of input.scss
+>> a {b: lightness()}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/too_many_args/input.scss
+a {b: lightness(red, green)}
+
+<===> error/too_many_args/error
+Error: Only 1 argument allowed, but 2 were passed.
+  ,
+1 | a {b: lightness(red, green)}
+  |       ^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_many_args/error-libsass
+Error: wrong number of arguments (2 for 1) for `lightness'
+        on line 1:7 of input.scss
+>> a {b: lightness(red, green)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/type/input.scss
+a {b: lightness(1)}
+
+<===> error/type/error
+Error: $color: 1 is not a color.
+  ,
+1 | a {b: lightness(1)}
+  |       ^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/type/error-libsass
+Error: argument `$color` of `lightness($color)` must be a color
+        on line 1:7 of input.scss, in function `lightness`
+        from line 1:7 of input.scss
+>> a {b: lightness(1)}
+
+   ------^
diff --git a/spec/core_functions/color/mix.hrx b/spec/core_functions/color/mix.hrx
new file mode 100644
index 0000000000..b9cbe079c4
--- /dev/null
+++ b/spec/core_functions/color/mix.hrx
@@ -0,0 +1,363 @@
+<===> unweighted/min_and_max/input.scss
+// Each channel becomes the average of 255 and 0, which is 128 = 0xAA.
+a {b: mix(#ff00ff, #00ff00)}
+
+<===> unweighted/min_and_max/output.css
+a {
+  b: gray;
+}
+
+<===>
+================================================================================
+<===> unweighted/identical/input.scss
+// If two channels have the same values, they should be the same in the output.
+a {b: mix(#123456, #123456)}
+
+<===> unweighted/identical/output.css
+a {
+  b: #123456;
+}
+
+<===>
+================================================================================
+<===> unweighted/average/input.scss
+// All channels should be averaged across the two colors.
+a {b: mix(#91e16f, #0144bf)}
+
+<===> unweighted/average/output.css
+a {
+  b: #499397;
+}
+
+<===>
+================================================================================
+<===> explicit_weight/even/input.scss
+a {b: mix(#91e16f, #0144bf, 50%)}
+
+<===> explicit_weight/even/output.css
+a {
+  b: #499397;
+}
+
+<===>
+================================================================================
+<===> explicit_weight/first/input.scss
+a {b: mix(#91e16f, #0144bf, 100%)}
+
+<===> explicit_weight/first/output.css
+a {
+  b: #91e16f;
+}
+
+<===>
+================================================================================
+<===> explicit_weight/last/input.scss
+a {b: mix(#91e16f, #0144bf, 0%)}
+
+<===> explicit_weight/last/output.css
+a {
+  b: #0144bf;
+}
+
+<===>
+================================================================================
+<===> explicit_weight/firstwards/input.scss
+a {b: mix(#91e16f, #0144bf, 92%)}
+
+<===> explicit_weight/firstwards/output.css
+a {
+  b: #85d475;
+}
+
+<===>
+================================================================================
+<===> explicit_weight/lastwards/input.scss
+a {b: mix(#91e16f, #0144bf, 43%)}
+
+<===> explicit_weight/lastwards/output.css
+a {
+  b: #3f889d;
+}
+
+<===>
+================================================================================
+<===> alpha/even/input.scss
+a {b: mix(rgba(#91e16f, 0.3), rgba(#0144bf, 0.3))}
+
+<===> alpha/even/output.css
+a {
+  b: rgba(73, 147, 151, 0.3);
+}
+
+<===>
+================================================================================
+<===> alpha/first/input.scss
+a {b: mix(#91e16f, transparent)}
+
+<===> alpha/first/output.css
+a {
+  b: rgba(145, 225, 111, 0.5);
+}
+
+<===>
+================================================================================
+<===> alpha/last/input.scss
+a {b: mix(transparent, #0144bf)}
+
+<===> alpha/last/output.css
+a {
+  b: rgba(1, 68, 191, 0.5);
+}
+
+<===>
+================================================================================
+<===> alpha/firstwards/input.scss
+a {b: mix(rgba(#91e16f, 0.8), rgba(#0144bf, 0.3))}
+
+<===> alpha/firstwards/output.css
+a {
+  b: rgba(109, 186, 131, 0.55);
+}
+
+<===>
+================================================================================
+<===> alpha/lastwards/input.scss
+a {b: mix(rgba(#91e16f, 0.4), rgba(#0144bf, 0.9))}
+
+<===> alpha/lastwards/output.css
+a {
+  b: rgba(37, 107, 171, 0.65);
+}
+
+<===>
+================================================================================
+<===> both_weights/transparent/first/input.scss
+a {b: mix(transparent, #0144bf, 70%)}
+
+<===> both_weights/transparent/first/output.css
+a {
+  b: rgba(1, 68, 191, 0.3);
+}
+
+<===>
+================================================================================
+<===> both_weights/transparent/last/input.scss
+a {b: mix(#91e16f, transparent, 70%)}
+
+<===> both_weights/transparent/last/output.css
+a {
+  b: rgba(145, 225, 111, 0.7);
+}
+
+<===>
+================================================================================
+<===> both_weights/weighted/first/input.scss
+a {b: mix(rgba(#91e16f, 0.2), rgba(#0144bf, 0.7), 100%)}
+
+<===> both_weights/weighted/first/output.css
+a {
+  b: rgba(145, 225, 111, 0.2);
+}
+
+<===>
+================================================================================
+<===> both_weights/weighted/last/input.scss
+a {b: mix(rgba(#91e16f, 0.2), rgba(#0144bf, 0.7), 0%)}
+
+<===> both_weights/weighted/last/output.css
+a {
+  b: rgba(1, 68, 191, 0.7);
+}
+
+<===>
+================================================================================
+<===> both_weights/mixed/firstwards/input.scss
+a {b: mix(rgba(#91e16f, 0.8), rgba(#0144bf, 0.3), 63%)}
+
+<===> both_weights/mixed/firstwards/output.css
+a {
+  b: rgba(121, 199, 124, 0.615);
+}
+
+<===>
+================================================================================
+<===> both_weights/mixed/lastwards/input.scss
+a {b: mix(rgba(#91e16f, 0.2), rgba(#0144bf, 0.7), 42%)}
+
+<===> both_weights/mixed/lastwards/output.css
+a {
+  b: rgba(29, 99, 175, 0.49);
+}
+
+<===>
+================================================================================
+<===> both_weights/contradiction/input.scss
+// When we weight entirely towards a transparent color, the formula for
+// computing the combined alpha would divide by zero, so we just return
+// transparent as a special case.
+a {b: mix(transparent, #0144bf, 100%)}
+
+<===> both_weights/contradiction/output.css
+a {
+  b: rgba(0, 0, 0, 0);
+}
+
+<===>
+================================================================================
+<===> named/options.yml
+---
+:todo:
+- sass/libsass#2894
+
+<===> named/input.scss
+a {b: mix($color1: #91e16f, $color2: #0144bf, $weight: 92%)}
+
+<===> named/output.css
+a {
+  b: #85d475;
+}
+
+<===>
+================================================================================
+<===> error/too_many_args/input.scss
+a {b: mix(red, blue, 100, 1)}
+
+<===> error/too_many_args/error
+Error: Only 3 arguments allowed, but 4 were passed.
+  ,
+1 | a {b: mix(red, blue, 100, 1)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_many_args/error-libsass
+Error: wrong number of arguments (4 for 3) for `mix'
+        on line 1:7 of input.scss
+>> a {b: mix(red, blue, 100, 1)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/too_few_args/input.scss
+a {b: mix(red)}
+
+<===> error/too_few_args/error
+Error: Missing argument $color2.
+  ,
+1 | a {b: mix(red)}
+  |       ^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_few_args/error-libsass
+Error: Function mix is missing argument $color-2.
+        on line 1 of input.scss
+>> a {b: mix(red)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/type/color1/input.scss
+a {b: mix(1, blue)}
+
+<===> error/type/color1/error
+Error: $color1: 1 is not a color.
+  ,
+1 | a {b: mix(1, blue)}
+  |       ^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/type/color1/error-libsass
+Error: argument `$color-1` of `mix($color-1, $color-2, $weight: 50%)` must be a color
+        on line 1:7 of input.scss, in function `mix`
+        from line 1:7 of input.scss
+>> a {b: mix(1, blue)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/type/color2/input.scss
+a {b: mix(red, 1)}
+
+<===> error/type/color2/error
+Error: $color2: 1 is not a color.
+  ,
+1 | a {b: mix(red, 1)}
+  |       ^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/type/color2/error-libsass
+Error: argument `$color-2` of `mix($color-1, $color-2, $weight: 50%)` must be a color
+        on line 1:7 of input.scss, in function `mix`
+        from line 1:7 of input.scss
+>> a {b: mix(red, 1)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/type/weight/input.scss
+a {b: mix(red, blue, green)}
+
+<===> error/type/weight/error
+Error: $weight: green is not a number.
+  ,
+1 | a {b: mix(red, blue, green)}
+  |       ^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/type/weight/error-libsass
+Error: argument `$weight` of `mix($color-1, $color-2, $weight: 50%)` must be a number
+        on line 1:7 of input.scss, in function `mix`
+        from line 1:7 of input.scss
+>> a {b: mix(red, blue, green)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/bounds/too_low/input.scss
+a {b: mix(red, blue, -0.001)}
+
+<===> error/bounds/too_low/error
+Error: Expected -0.001 to be within 0 and 100.
+  ,
+1 | a {b: mix(red, blue, -0.001)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/bounds/too_low/error-libsass
+Error: argument `$weight` of `mix($color-1, $color-2, $weight: 50%)` must be between -0 and 100
+        on line 1:7 of input.scss, in function `mix`
+        from line 1:7 of input.scss
+>> a {b: mix(red, blue, -0.001)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/bounds/too_high/input.scss
+a {b: mix(red, blue, 100.001)}
+
+<===> error/bounds/too_high/error
+Error: Expected 100.001 to be within 0 and 100.
+  ,
+1 | a {b: mix(red, blue, 100.001)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/bounds/too_high/error-libsass
+Error: argument `$weight` of `mix($color-1, $color-2, $weight: 50%)` must be between -0 and 100
+        on line 1:7 of input.scss, in function `mix`
+        from line 1:7 of input.scss
+>> a {b: mix(red, blue, 100.001)}
+
+   ------^
diff --git a/spec/core_functions/color/red.hrx b/spec/core_functions/color/red.hrx
new file mode 100644
index 0000000000..6d4ddd12b5
--- /dev/null
+++ b/spec/core_functions/color/red.hrx
@@ -0,0 +1,98 @@
+<===> max/input.scss
+a {b: red(rgb(255, 0, 0))}
+
+<===> max/output.css
+a {
+  b: 255;
+}
+
+<===>
+================================================================================
+<===> min/input.scss
+a {b: red(rgb(0, 0, 0))}
+
+<===> min/output.css
+a {
+  b: 0;
+}
+
+<===>
+================================================================================
+<===> middle/input.scss
+a {b: red(rgb(123, 0, 0))}
+
+<===> middle/output.css
+a {
+  b: 123;
+}
+
+<===>
+================================================================================
+<===> named/input.scss
+a {b: red($color: rgb(234, 0, 0))}
+
+<===> named/output.css
+a {
+  b: 234;
+}
+
+<===>
+================================================================================
+<===> error/too_few_args/input.scss
+a {b: red()}
+
+<===> error/too_few_args/error
+Error: Missing argument $color.
+  ,
+1 | a {b: red()}
+  |       ^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_few_args/error-libsass
+Error: Function red is missing argument $color.
+        on line 1 of input.scss
+>> a {b: red()}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/too_many_args/input.scss
+a {b: red(red, green)}
+
+<===> error/too_many_args/error
+Error: Only 1 argument allowed, but 2 were passed.
+  ,
+1 | a {b: red(red, green)}
+  |       ^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_many_args/error-libsass
+Error: wrong number of arguments (2 for 1) for `red'
+        on line 1:7 of input.scss
+>> a {b: red(red, green)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/type/input.scss
+a {b: red(1)}
+
+<===> error/type/error
+Error: $color: 1 is not a color.
+  ,
+1 | a {b: red(1)}
+  |       ^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/type/error-libsass
+Error: argument `$color` of `red($color)` must be a color
+        on line 1:7 of input.scss, in function `red`
+        from line 1:7 of input.scss
+>> a {b: red(1)}
+
+   ------^
diff --git a/spec/core_functions/color/rgb/error/four_args.hrx b/spec/core_functions/color/rgb/error/four_args.hrx
index 48eeb092d3..7be4d51213 100644
--- a/spec/core_functions/color/rgb/error/four_args.hrx
+++ b/spec/core_functions/color/rgb/error/four_args.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2722
+- sass/libsass#2722
 
 <===>
 ================================================================================
diff --git a/spec/core_functions/color/rgb/error/one_arg.hrx b/spec/core_functions/color/rgb/error/one_arg.hrx
index 44bc2acad5..73d8c56dfb 100644
--- a/spec/core_functions/color/rgb/error/one_arg.hrx
+++ b/spec/core_functions/color/rgb/error/one_arg.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2722
+- sass/libsass#2722
 
 <===>
 ================================================================================
diff --git a/spec/core_functions/color/rgb/error/two_args.hrx b/spec/core_functions/color/rgb/error/two_args.hrx
index dfcdbb3969..d6618a7cdd 100644
--- a/spec/core_functions/color/rgb/error/two_args.hrx
+++ b/spec/core_functions/color/rgb/error/two_args.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2722
+- sass/libsass#2722
 
 <===>
 ================================================================================
diff --git a/spec/core_functions/color/rgb/four_args/alpha.hrx b/spec/core_functions/color/rgb/four_args/alpha.hrx
new file mode 100644
index 0000000000..c13f983753
--- /dev/null
+++ b/spec/core_functions/color/rgb/four_args/alpha.hrx
@@ -0,0 +1,98 @@
+<===> percent/negative/input.scss
+a {b: rgb(0, 0, 0, -10%)}
+
+<===> percent/negative/output.css
+a {
+  b: rgba(0, 0, 0, 0);
+}
+
+<===>
+================================================================================
+<===> percent/min/input.scss
+a {b: rgb(0, 0, 0, 0%)}
+
+<===> percent/min/output.css
+a {
+  b: rgba(0, 0, 0, 0);
+}
+
+<===>
+================================================================================
+<===> percent/positive/input.scss
+a {b: rgb(0, 0, 0, 45.6%)}
+
+<===> percent/positive/output.css
+a {
+  b: rgba(0, 0, 0, 0.456);
+}
+
+<===>
+================================================================================
+<===> percent/max/input.scss
+a {b: rgb(0, 0, 0, 100%)}
+
+<===> percent/max/output.css
+a {
+  b: black;
+}
+
+<===>
+================================================================================
+<===> percent/above/max/input.scss
+a {b: rgb(0, 0, 0, 250%)}
+
+<===> percent/above/max/output.css
+a {
+  b: black;
+}
+
+<===>
+================================================================================
+<===> unitless/negative/input.scss
+a {b: rgb(0, 0, 0, -10)}
+
+<===> unitless/negative/output.css
+a {
+  b: rgba(0, 0, 0, 0);
+}
+
+<===>
+================================================================================
+<===> unitless/min/input.scss
+a {b: rgb(0, 0, 0, 0)}
+
+<===> unitless/min/output.css
+a {
+  b: rgba(0, 0, 0, 0);
+}
+
+<===>
+================================================================================
+<===> unitless/positive/input.scss
+a {b: rgb(0, 0, 0, 0.456)}
+
+<===> unitless/positive/output.css
+a {
+  b: rgba(0, 0, 0, 0.456);
+}
+
+<===>
+================================================================================
+<===> unitless/max/input.scss
+a {b: rgb(0, 0, 0, 1)}
+
+<===> unitless/max/output.css
+a {
+  b: black;
+}
+
+<===>
+================================================================================
+<===> unitless/above/max/input.scss
+a {b: rgb(0, 0, 0, 250)}
+
+<===> unitless/above/max/output.css
+a {
+  b: black;
+}
+
diff --git a/spec/core_functions/color/rgb/four_args/alpha_percent.hrx b/spec/core_functions/color/rgb/four_args/alpha_percent.hrx
deleted file mode 100644
index f3c22b2ee4..0000000000
--- a/spec/core_functions/color/rgb/four_args/alpha_percent.hrx
+++ /dev/null
@@ -1,17 +0,0 @@
-<===> input.scss
-.alpha-percent {
-  negative: rgb(0, 0, 0, -10%);
-  min: rgb(0, 0, 0, 0%);
-  positive: rgb(0, 0, 0, 45.6%);
-  max: rgb(0, 0, 0, 100%);
-  above-max: rgb(0, 0, 0, 250%);
-}
-
-<===> output.css
-.alpha-percent {
-  negative: rgba(0, 0, 0, 0);
-  min: rgba(0, 0, 0, 0);
-  positive: rgba(0, 0, 0, 0.456);
-  max: black;
-  above-max: black;
-}
diff --git a/spec/core_functions/color/rgb/four_args/alpha_unitless.hrx b/spec/core_functions/color/rgb/four_args/alpha_unitless.hrx
deleted file mode 100644
index 403b27aa5e..0000000000
--- a/spec/core_functions/color/rgb/four_args/alpha_unitless.hrx
+++ /dev/null
@@ -1,17 +0,0 @@
-<===> input.scss
-.alpha-unitless {
-  negative: rgb(0, 0, 0, -10);
-  min: rgb(0, 0, 0, 0);
-  positive: rgb(0, 0, 0, 0.456);
-  max: rgb(0, 0, 0, 1);
-  above-max: rgb(0, 0, 0, 250);
-}
-
-<===> output.css
-.alpha-unitless {
-  negative: rgba(0, 0, 0, 0);
-  min: rgba(0, 0, 0, 0);
-  positive: rgba(0, 0, 0, 0.456);
-  max: black;
-  above-max: black;
-}
diff --git a/spec/core_functions/color/rgb/four_args/basic.hrx b/spec/core_functions/color/rgb/four_args/basic.hrx
deleted file mode 100644
index 6c263fb6fb..0000000000
--- a/spec/core_functions/color/rgb/four_args/basic.hrx
+++ /dev/null
@@ -1,32 +0,0 @@
-<===> input.scss
-basic {
-  transparent: rgb(0, 255, 127, 0);
-  opaque: rgb(190, 173, 237, 1);
-  partial: rgb(18, 52, 86, 0.5);
-  named: rgb($red: 0, $green: 255, $blue: 127, $alpha: 0.3);
-}
-
-// Channels that are out of bounds are clamped within bounds.
-clamped {
-  red: rgb(256, 0, 0, 0.5);
-  green: rgb(0, -1, 0, 0.5);
-  blue: rgb(0, 0, 9999, 0.5);
-  alpha-above: rgb(0, 0, 0, 1.1);
-  alpha-below: rgb(0, 0, 0, -0.1);
-}
-
-<===> output.css
-basic {
-  transparent: rgba(0, 255, 127, 0);
-  opaque: #beaded;
-  partial: rgba(18, 52, 86, 0.5);
-  named: rgba(0, 255, 127, 0.3);
-}
-
-clamped {
-  red: rgba(255, 0, 0, 0.5);
-  green: rgba(0, 0, 0, 0.5);
-  blue: rgba(0, 0, 255, 0.5);
-  alpha-above: black;
-  alpha-below: rgba(0, 0, 0, 0);
-}
diff --git a/spec/core_functions/color/rgb/four_args/clamped.hrx b/spec/core_functions/color/rgb/four_args/clamped.hrx
new file mode 100644
index 0000000000..17ae727ddd
--- /dev/null
+++ b/spec/core_functions/color/rgb/four_args/clamped.hrx
@@ -0,0 +1,53 @@
+<===> README.md
+Channels that are out of bounds are clamped within bounds.
+
+<===>
+================================================================================
+<===> red/input.scss
+a {b: rgb(256, 0, 0, 0.5)}
+
+<===> red/output.css
+a {
+  b: rgba(255, 0, 0, 0.5);
+}
+
+<===>
+================================================================================
+<===> green/input.scss
+a {b: rgb(0, -1, 0, 0.5)}
+
+<===> green/output.css
+a {
+  b: rgba(0, 0, 0, 0.5);
+}
+
+<===>
+================================================================================
+<===> blue/input.scss
+a {b: rgb(0, 0, 9999, 0.5)}
+
+<===> blue/output.css
+a {
+  b: rgba(0, 0, 255, 0.5);
+}
+
+<===>
+================================================================================
+<===> alpha/above/input.scss
+a {b: rgb(0, 0, 0, 1.1)}
+
+<===> alpha/above/output.css
+a {
+  b: black;
+}
+
+<===>
+================================================================================
+<===> alpha/below/input.scss
+a {b: rgb(0, 0, 0, -0.1)}
+
+<===> alpha/below/output.css
+a {
+  b: rgba(0, 0, 0, 0);
+}
+
diff --git a/spec/core_functions/color/rgb/four_args/in_gamut.hrx b/spec/core_functions/color/rgb/four_args/in_gamut.hrx
new file mode 100644
index 0000000000..671e2d4630
--- /dev/null
+++ b/spec/core_functions/color/rgb/four_args/in_gamut.hrx
@@ -0,0 +1,37 @@
+<===> transparent/input.scss
+a {b: rgb(0, 255, 127, 0)}
+
+<===> transparent/output.css
+a {
+  b: rgba(0, 255, 127, 0);
+}
+
+<===>
+================================================================================
+<===> opaque/input.scss
+a {b: rgb(190, 173, 237, 1)}
+
+<===> opaque/output.css
+a {
+  b: #beaded;
+}
+
+<===>
+================================================================================
+<===> partial/input.scss
+a {b: rgb(18, 52, 86, 0.5)}
+
+<===> partial/output.css
+a {
+  b: rgba(18, 52, 86, 0.5);
+}
+
+<===>
+================================================================================
+<===> named/input.scss
+a {b: rgb($red: 0, $green: 255, $blue: 127, $alpha: 0.3)}
+
+<===> named/output.css
+a {
+  b: rgba(0, 255, 127, 0.3);
+}
diff --git a/spec/core_functions/color/rgb/four_args/options.yml b/spec/core_functions/color/rgb/four_args/options.yml
index 076f9d2d59..018b0da451 100644
--- a/spec/core_functions/color/rgb/four_args/options.yml
+++ b/spec/core_functions/color/rgb/four_args/options.yml
@@ -1,3 +1,3 @@
 ---
 :todo:
-- libsass # sass/libsass#2722
+- sass/libsass#2722
diff --git a/spec/core_functions/color/rgb/four_args/special_functions.hrx b/spec/core_functions/color/rgb/four_args/special_functions.hrx
index 3868d21c9a..c23e57c2a1 100644
--- a/spec/core_functions/color/rgb/four_args/special_functions.hrx
+++ b/spec/core_functions/color/rgb/four_args/special_functions.hrx
@@ -1,65 +1,245 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2726
-
-<===> input.scss
-a {
-  calc-1: rgb(calc(1), 2, 3, 0.4);
-  calc-2: rgb(1, calc(2), 3, 0.4);
-  calc-3: rgb(1, 2, calc(3), 0.4);
-  calc-4: rgb(1, 2, 3, calc(0.4));
-
-  var-1: rgb(var(--foo), 2, 3, 0.4);
-  var-2: rgb(1, var(--foo), 3, 0.4);
-  var-3: rgb(1, 2, var(--foo), 0.4);
-  var-4: rgb(1, 2, 3, var(--foo));
-
-  env-1: rgb(env(--foo), 2, 3, 0.4);
-  env-2: rgb(1, env(--foo), 3, 0.4);
-  env-3: rgb(1, 2, env(--foo), 0.4);
-  env-4: rgb(1, 2, 3, env(--foo));
-
-  min-1: rgb(min(1), 2, 3, 0.4);
-  min-2: rgb(1, min(2), 3, 0.4);
-  min-3: rgb(1, 2, min(3), 0.4);
-  min-4: rgb(1, 2, 3, min(0.4));
-
-  max-1: rgb(max(1), 2, 3, 0.4);
-  max-2: rgb(1, max(2), 3, 0.4);
-  max-3: rgb(1, 2, max(3), 0.4);
-  max-4: rgb(1, 2, 3, max(0.4));
-
-  calc-2-args: rgb(blue, calc(0.4));
-  var-2-args-alpha: rgb(blue, var(--foo));
-  var-2-args-color: rgb(var(--foo), 0.4);
-  var-2-args-both: rgb(var(--foo), var(--foo));
-}
-
-<===> output.css
-a {
-  calc-1: rgb(calc(1), 2, 3, 0.4);
-  calc-2: rgb(1, calc(2), 3, 0.4);
-  calc-3: rgb(1, 2, calc(3), 0.4);
-  calc-4: rgb(1, 2, 3, calc(0.4));
-  var-1: rgb(var(--foo), 2, 3, 0.4);
-  var-2: rgb(1, var(--foo), 3, 0.4);
-  var-3: rgb(1, 2, var(--foo), 0.4);
-  var-4: rgb(1, 2, 3, var(--foo));
-  env-1: rgb(env(--foo), 2, 3, 0.4);
-  env-2: rgb(1, env(--foo), 3, 0.4);
-  env-3: rgb(1, 2, env(--foo), 0.4);
-  env-4: rgb(1, 2, 3, env(--foo));
-  min-1: rgb(min(1), 2, 3, 0.4);
-  min-2: rgb(1, min(2), 3, 0.4);
-  min-3: rgb(1, 2, min(3), 0.4);
-  min-4: rgb(1, 2, 3, min(0.4));
-  max-1: rgb(max(1), 2, 3, 0.4);
-  max-2: rgb(1, max(2), 3, 0.4);
-  max-3: rgb(1, 2, max(3), 0.4);
-  max-4: rgb(1, 2, 3, max(0.4));
-  calc-2-args: rgb(0, 0, 255, calc(0.4));
-  var-2-args-alpha: rgb(0, 0, 255, var(--foo));
-  var-2-args-color: rgb(var(--foo), 0.4);
-  var-2-args-both: rgb(var(--foo), var(--foo));
+- sass/libsass#2726
+
+<===>
+================================================================================
+<===> calc/arg_1/input.scss
+a {b: rgb(calc(1), 2, 3, 0.4)}
+
+<===> calc/arg_1/output.css
+a {
+  b: rgb(calc(1), 2, 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> calc/arg_2/input.scss
+a {b: rgb(1, calc(2), 3, 0.4)}
+
+<===> calc/arg_2/output.css
+a {
+  b: rgb(1, calc(2), 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> calc/arg_3/input.scss
+a {b: rgb(1, 2, calc(3), 0.4)}
+
+<===> calc/arg_3/output.css
+a {
+  b: rgb(1, 2, calc(3), 0.4);
+}
+
+<===>
+================================================================================
+<===> calc/arg_4/input.scss
+a {b: rgb(1, 2, 3, calc(0.4))}
+
+<===> calc/arg_4/output.css
+a {
+  b: rgb(1, 2, 3, calc(0.4));
+}
+
+<===>
+================================================================================
+<===> var/arg_1/input.scss
+a {b: rgb(var(--foo), 2, 3, 0.4)}
+
+<===> var/arg_1/output.css
+a {
+  b: rgb(var(--foo), 2, 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> var/arg_2/input.scss
+a {b: rgb(1, var(--foo), 3, 0.4)}
+
+<===> var/arg_2/output.css
+a {
+  b: rgb(1, var(--foo), 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> var/arg_3/input.scss
+a {b: rgb(1, 2, var(--foo), 0.4)}
+
+<===> var/arg_3/output.css
+a {
+  b: rgb(1, 2, var(--foo), 0.4);
+}
+
+<===>
+================================================================================
+<===> var/arg_4/input.scss
+a {b: rgb(1, 2, 3, var(--foo))}
+
+<===> var/arg_4/output.css
+a {
+  b: rgb(1, 2, 3, var(--foo));
+}
+
+<===>
+================================================================================
+<===> env/arg_1/input.scss
+a {b: rgb(env(--foo), 2, 3, 0.4)}
+
+<===> env/arg_1/output.css
+a {
+  b: rgb(env(--foo), 2, 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> env/arg_2/input.scss
+a {b: rgb(1, env(--foo), 3, 0.4)}
+
+<===> env/arg_2/output.css
+a {
+  b: rgb(1, env(--foo), 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> env/arg_3/input.scss
+a {b: rgb(1, 2, env(--foo), 0.4)}
+
+<===> env/arg_3/output.css
+a {
+  b: rgb(1, 2, env(--foo), 0.4);
+}
+
+<===>
+================================================================================
+<===> env/arg_4/input.scss
+a {b: rgb(1, 2, 3, env(--foo))}
+
+<===> env/arg_4/output.css
+a {
+  b: rgb(1, 2, 3, env(--foo));
+}
+
+<===>
+================================================================================
+<===> min/arg_1/input.scss
+a {b: rgb(min(1), 2, 3, 0.4)}
+
+<===> min/arg_1/output.css
+a {
+  b: rgb(min(1), 2, 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> min/arg_2/input.scss
+a {b: rgb(1, min(2), 3, 0.4)}
+
+<===> min/arg_2/output.css
+a {
+  b: rgb(1, min(2), 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> min/arg_3/input.scss
+a {b: rgb(1, 2, min(3), 0.4)}
+
+<===> min/arg_3/output.css
+a {
+  b: rgb(1, 2, min(3), 0.4);
+}
+
+<===>
+================================================================================
+<===> min/arg_4/input.scss
+a {b: rgb(1, 2, 3, min(0.4))}
+
+<===> min/arg_4/output.css
+a {
+  b: rgb(1, 2, 3, min(0.4));
+}
+
+<===>
+================================================================================
+<===> max/arg_1/input.scss
+a {b: rgb(max(1), 2, 3, 0.4)}
+
+<===> max/arg_1/output.css
+a {
+  b: rgb(max(1), 2, 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> max/arg_2/input.scss
+a {b: rgb(1, max(2), 3, 0.4)}
+
+<===> max/arg_2/output.css
+a {
+  b: rgb(1, max(2), 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> max/arg_3/input.scss
+a {b: rgb(1, 2, max(3), 0.4)}
+
+<===> max/arg_3/output.css
+a {
+  b: rgb(1, 2, max(3), 0.4);
+}
+
+<===>
+================================================================================
+<===> max/arg_4/input.scss
+a {b: rgb(1, 2, 3, max(0.4))}
+
+<===> max/arg_4/output.css
+a {
+  b: rgb(1, 2, 3, max(0.4));
+}
+
+<===>
+================================================================================
+<===> calc/arg_2/args/input.scss
+a {b: rgb(blue, calc(0.4))}
+
+<===> calc/arg_2/args/output.css
+a {
+  b: rgb(0, 0, 255, calc(0.4));
+}
+
+<===>
+================================================================================
+<===> var/arg_2/args/alpha/input.scss
+a {b: rgb(blue, var(--foo))}
+
+<===> var/arg_2/args/alpha/output.css
+a {
+  b: rgb(0, 0, 255, var(--foo));
+}
+
+<===>
+================================================================================
+<===> var/arg_2/args/color/input.scss
+a {b: rgb(var(--foo), 0.4)}
+
+<===> var/arg_2/args/color/output.css
+a {
+  b: rgb(var(--foo), 0.4);
+}
+
+<===>
+================================================================================
+<===> var/arg_2/args/both/input.scss
+a {b: rgb(var(--foo), var(--foo))}
+
+<===> var/arg_2/args/both/output.css
+a {
+  b: rgb(var(--foo), var(--foo));
 }
+
diff --git a/spec/core_functions/color/rgb/multi_argument_var.hrx b/spec/core_functions/color/rgb/multi_argument_var.hrx
index 01c41d4ed9..814e7c0505 100644
--- a/spec/core_functions/color/rgb/multi_argument_var.hrx
+++ b/spec/core_functions/color/rgb/multi_argument_var.hrx
@@ -3,23 +3,64 @@
 :todo:
 - libsass
 
-<===> input.scss
+<===>
+================================================================================
+<===> 1_of_3/input.scss
+// var() is substituted before parsing, so it may contain multiple arguments.
+a {b: rgb(var(--foo), 3, 0.4)}
+
+<===> 1_of_3/output.css
 a {
-  // var() is substituted before parsing, so it may contain multiple arguments.
   b: rgb(var(--foo), 3, 0.4);
-  b: rgb(1, var(--foo), 0.4);
-  b: rgb(1, 2, var(--foo));
-  b: rgb(var(--foo), 0.4);
-  b: rgb(1, var(--foo));
-  b: rgb(var(--foo));
 }
 
-<===> output.css
+<===>
+================================================================================
+<===> 2_of_3/input.scss
+a {b: rgb(1, var(--foo), 0.4)}
+
+<===> 2_of_3/output.css
 a {
-  b: rgb(var(--foo), 3, 0.4);
   b: rgb(1, var(--foo), 0.4);
+}
+
+<===>
+================================================================================
+<===> 3_of_3/input.scss
+a {b: rgb(1, 2, var(--foo))}
+
+<===> 3_of_3/output.css
+a {
   b: rgb(1, 2, var(--foo));
+}
+
+<===>
+================================================================================
+<===> 1_of_2/input.scss
+a {b: rgb(var(--foo), 0.4)}
+
+<===> 1_of_2/output.css
+a {
   b: rgb(var(--foo), 0.4);
+}
+
+<===>
+================================================================================
+<===> 2_of_2/input.scss
+a {b: rgb(1, var(--foo))}
+
+<===> 2_of_2/output.css
+a {
   b: rgb(1, var(--foo));
+}
+
+<===>
+================================================================================
+<===> 1_of_1/input.scss
+a {b: rgb(var(--foo))}
+
+<===> 1_of_1/output.css
+a {
   b: rgb(var(--foo));
 }
+
diff --git a/spec/core_functions/color/rgb/one_arg/alpha.hrx b/spec/core_functions/color/rgb/one_arg/alpha.hrx
index 2134d07060..6b6001bc21 100644
--- a/spec/core_functions/color/rgb/one_arg/alpha.hrx
+++ b/spec/core_functions/color/rgb/one_arg/alpha.hrx
@@ -1,42 +1,134 @@
-<===> input.scss
-basic {
-  transparent: rgb(0 255 127 / 0);
-  opaque: rgb(190 173 237 / 1);
-  partial: rgb(18 52 86 / 0.5);
-  percent: rgb(18 52 86 / 50%);
-  named: rgb($channels: 0 255 127 / 0.3);
-
-  // Extra parens shouldn't cause the slash to be forced into division.
-  parenthesized: (rgb(0 255 127 / 0.3));
-}
-
-// Channels that are out of bounds are clamped within bounds.
-clamped {
-  red: rgb(256 0 0 / 0.5);
-  green: rgb(0 -1 0 / 0.5);
-  blue: rgb(0 0 9999 / 0.5);
-  alpha-above: rgb(0 0 0 / 1.1);
-  alpha-below: rgb(0 0 0 / -0.1);
-  alpha-above-percent: rgb(0 0 0 / 250%);
-  alpha-below-percent: rgb(0 0 0 / -10%);
-}
-
-<===> output.css
-basic {
-  transparent: rgba(0, 255, 127, 0);
-  opaque: #beaded;
-  partial: rgba(18, 52, 86, 0.5);
-  percent: rgba(18, 52, 86, 0.5);
-  named: rgba(0, 255, 127, 0.3);
-  parenthesized: rgba(0, 255, 127, 0.3);
-}
-
-clamped {
-  red: rgba(255, 0, 0, 0.5);
-  green: rgba(0, 0, 0, 0.5);
-  blue: rgba(0, 0, 255, 0.5);
-  alpha-above: black;
-  alpha-below: rgba(0, 0, 0, 0);
-  alpha-above-percent: black;
-  alpha-below-percent: rgba(0, 0, 0, 0);
+<===> in_gamut/transparent/input.scss
+a {b: rgb(0 255 127 / 0)}
+
+<===> in_gamut/transparent/output.css
+a {
+  b: rgba(0, 255, 127, 0);
+}
+
+<===>
+================================================================================
+<===> in_gamut/opaque/input.scss
+a {b: rgb(190 173 237 / 1)}
+
+<===> in_gamut/opaque/output.css
+a {
+  b: #beaded;
+}
+
+<===>
+================================================================================
+<===> in_gamut/partial/input.scss
+a {b: rgb(18 52 86 / 0.5)}
+
+<===> in_gamut/partial/output.css
+a {
+  b: rgba(18, 52, 86, 0.5);
+}
+
+<===>
+================================================================================
+<===> in_gamut/percent/input.scss
+a {b: rgb(18 52 86 / 50%)}
+
+<===> in_gamut/percent/output.css
+a {
+  b: rgba(18, 52, 86, 0.5);
+}
+
+<===>
+================================================================================
+<===> in_gamut/named/input.scss
+a {b: rgb($channels: 0 255 127 / 0.3)}
+
+<===> in_gamut/named/output.css
+a {
+  b: rgba(0, 255, 127, 0.3);
+}
+
+<===>
+================================================================================
+<===> in_gamut/parenthesized/input.scss
+// Extra parens shouldn't cause the slash to be forced into division.
+a {b: rgb(0 255 127 / 0.3)}
+
+<===> in_gamut/parenthesized/output.css
+a {
+  b: rgba(0, 255, 127, 0.3);
+}
+
+<===>
+================================================================================
+<===> clamped/README.md
+Channels that are out of bounds are clamped within bounds.
+
+<===>
+================================================================================
+<===> clamped/red/input.scss
+a {b: rgb(256 0 0 / 0.5)}
+
+<===> clamped/red/output.css
+a {
+  b: rgba(255, 0, 0, 0.5);
 }
+
+<===>
+================================================================================
+<===> clamped/green/input.scss
+a {b: rgb(0 -1 0 / 0.5)}
+
+<===> clamped/green/output.css
+a {
+  b: rgba(0, 0, 0, 0.5);
+}
+
+<===>
+================================================================================
+<===> clamped/blue/input.scss
+a {b: rgb(0 0 9999 / 0.5)}
+
+<===> clamped/blue/output.css
+a {
+  b: rgba(0, 0, 255, 0.5);
+}
+
+<===>
+================================================================================
+<===> clamped/alpha/above/input.scss
+a {b: rgb(0 0 0 / 1.1)}
+
+<===> clamped/alpha/above/output.css
+a {
+  b: black;
+}
+
+<===>
+================================================================================
+<===> clamped/alpha/below/input.scss
+a {b: rgb(0 0 0 / -0.1)}
+
+<===> clamped/alpha/below/output.css
+a {
+  b: rgba(0, 0, 0, 0);
+}
+
+<===>
+================================================================================
+<===> clamped/alpha/above/percent/input.scss
+a {b: rgb(0 0 0 / 250%)}
+
+<===> clamped/alpha/above/percent/output.css
+a {
+  b: black;
+}
+
+<===>
+================================================================================
+<===> clamped/alpha/below/percent/input.scss
+a {b: rgb(0 0 0 / -10%)}
+
+<===> clamped/alpha/below/percent/output.css
+a {
+  b: rgba(0, 0, 0, 0);
+}
+
diff --git a/spec/core_functions/color/rgb/one_arg/basic.hrx b/spec/core_functions/color/rgb/one_arg/basic.hrx
deleted file mode 100644
index acfa0c7e01..0000000000
--- a/spec/core_functions/color/rgb/one_arg/basic.hrx
+++ /dev/null
@@ -1,56 +0,0 @@
-<===> input.scss
-// Channels may be specified as unitless numbers between 0 and 255.
-unitless {
-  numbers: rgb(18 52 86);
-  beaded: rgb(190 173 237);
-  springgreen: rgb(0 255 127);
-  named: rgb($channels: 0 255 127);
-
-  // Channels that are out of bounds are clamped within bounds.
-  clamped {
-    red: rgb(256 0 0);
-    green: rgb(0 -1 0);
-    blue: rgb(0 0 9999);
-  }
-}
-
-// Channels may also be specified as percents between 0% and 100%, which may be
-// mixed with unitless numbers.
-percents {
-  all-percent: rgb(7.1% 20.4% 33.9%);
-  unitless-green: rgb(74.7% 173 93%);
-  percent-green: rgb(190 68% 237);
-  boundaries: rgb(0% 100% 50%);
-
-  // Channels that are out of bounds are clamped within bounds.
-  clamped {
-    red: rgb(100.1% 0 0);
-    green: rgb(0 -0.1% 0);
-    blue: rgb(0 0 200%);
-  }
-}
-
-<===> output.css
-unitless {
-  numbers: #123456;
-  beaded: #beaded;
-  springgreen: springgreen;
-  named: springgreen;
-}
-unitless clamped {
-  red: red;
-  green: black;
-  blue: blue;
-}
-
-percents {
-  all-percent: #123456;
-  unitless-green: #beaded;
-  percent-green: #beaded;
-  boundaries: #00ff80;
-}
-percents clamped {
-  red: red;
-  green: black;
-  blue: blue;
-}
diff --git a/spec/core_functions/color/rgb/one_arg/no_alpha.hrx b/spec/core_functions/color/rgb/one_arg/no_alpha.hrx
new file mode 100644
index 0000000000..b5a89725f3
--- /dev/null
+++ b/spec/core_functions/color/rgb/one_arg/no_alpha.hrx
@@ -0,0 +1,159 @@
+<===> unitless/README.md
+Channels may be specified as unitless numbers between 0 and 255.
+
+<===>
+================================================================================
+<===> unitless/numbers/input.scss
+a {b: rgb(18 52 86)}
+
+<===> unitless/numbers/output.css
+a {
+  b: #123456;
+}
+
+<===>
+================================================================================
+<===> unitless/beaded/input.scss
+a {b: rgb(190 173 237)}
+
+<===> unitless/beaded/output.css
+a {
+  b: #beaded;
+}
+
+<===>
+================================================================================
+<===> unitless/springgreen/input.scss
+a {b: rgb(0 255 127)}
+
+<===> unitless/springgreen/output.css
+a {
+  b: springgreen;
+}
+
+<===>
+================================================================================
+<===> unitless/named/input.scss
+a {b: rgb($channels: 0 255 127)}
+
+<===> unitless/named/output.css
+a {
+  b: springgreen;
+}
+
+<===>
+================================================================================
+<===> unitless/clamped/README.md
+Channels that are out of bounds are clamped within bounds.
+
+<===>
+================================================================================
+<===> unitless/clamped/red/input.scss
+a {b: rgb(256 0 0)}
+
+<===> unitless/clamped/red/output.css
+a {
+  b: red;
+}
+
+<===>
+================================================================================
+<===> unitless/clamped/green/input.scss
+a {b: rgb(0 -1 0)}
+
+<===> unitless/clamped/green/output.css
+a {
+  b: black;
+}
+
+<===>
+================================================================================
+<===> unitless/clamped/blue/input.scss
+a {b: rgb(0 0 9999)}
+
+<===> unitless/clamped/blue/output.css
+a {
+  b: blue;
+}
+
+<===>
+================================================================================
+<===> percents/README.md
+Channels may also be specified as percents between 0% and 100%, which may be
+// mixed with unitless numbers.
+
+<===>
+================================================================================
+<===> percents/all/percent/input.scss
+a {b: rgb(7.1% 20.4% 33.9%)}
+
+<===> percents/all/percent/output.css
+a {
+  b: #123456;
+}
+
+<===>
+================================================================================
+<===> percents/unitless/green/input.scss
+a {b: rgb(74.7% 173 93%)}
+
+<===> percents/unitless/green/output.css
+a {
+  b: #beaded;
+}
+
+<===>
+================================================================================
+<===> percents/percent/green/input.scss
+a {b: rgb(190 68% 237)}
+
+<===> percents/percent/green/output.css
+a {
+  b: #beaded;
+}
+
+<===>
+================================================================================
+<===> percents/boundaries/input.scss
+a {b: rgb(0% 100% 50%)}
+
+<===> percents/boundaries/output.css
+a {
+  b: #00ff80;
+}
+
+<===>
+================================================================================
+<===> percents/clamped/README.md
+Channels that are out of bounds are clamped within bounds.
+
+<===>
+================================================================================
+<===> percents/clamped/red/input.scss
+a {b: rgb(100.1% 0 0)}
+
+<===> percents/clamped/red/output.css
+a {
+  b: red;
+}
+
+<===>
+================================================================================
+<===> percents/clamped/green/input.scss
+a {b: rgb(0 -0.1% 0)}
+
+<===> percents/clamped/green/output.css
+a {
+  b: black;
+}
+
+<===>
+================================================================================
+<===> percents/clamped/blue/input.scss
+a {b: rgb(0 0 200%)}
+
+<===> percents/clamped/blue/output.css
+a {
+  b: blue;
+}
+
diff --git a/spec/core_functions/color/rgb/one_arg/options.yml b/spec/core_functions/color/rgb/one_arg/options.yml
index 076f9d2d59..018b0da451 100644
--- a/spec/core_functions/color/rgb/one_arg/options.yml
+++ b/spec/core_functions/color/rgb/one_arg/options.yml
@@ -1,3 +1,3 @@
 ---
 :todo:
-- libsass # sass/libsass#2722
+- sass/libsass#2722
diff --git a/spec/core_functions/color/rgb/one_arg/special_functions.hrx b/spec/core_functions/color/rgb/one_arg/special_functions.hrx
index df760b0323..bb4be2a8b5 100644
--- a/spec/core_functions/color/rgb/one_arg/special_functions.hrx
+++ b/spec/core_functions/color/rgb/one_arg/special_functions.hrx
@@ -1,112 +1,416 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2726
-
-<===> input.scss
-no-alpha {
-  calc-1: rgb(calc(1) 2 3);
-  calc-2: rgb(1 calc(2) 3);
-  calc-3: rgb(1 2 calc(3));
-
-  var-1: rgb(var(--foo) 2 3);
-  var-2: rgb(1 var(--foo) 3);
-  var-3: rgb(1 2 var(--foo));
-
-  env-1: rgb(env(--foo) 2 3);
-  env-2: rgb(1 env(--foo) 3);
-  env-3: rgb(1 2 env(--foo));
-
-  min-1: rgb(min(1) 2 3);
-  min-2: rgb(1 min(2) 3);
-  min-3: rgb(1 2 min(3));
-
-  max-1: rgb(max(1) 2 3);
-  max-2: rgb(1 max(2) 3);
-  max-3: rgb(1 2 max(3));
-
-  // var() is substituted before parsing, so it may contain multiple arguments.
-  multi-argument-var-1-of-2: rgb(var(--foo) 2);
-  multi-argument-var-2-of-2: rgb(1 var(--foo));
-  multi-argument-var-1-of-1: rgb(var(--foo));
-}
-
-alpha {
-  calc-1: rgb(calc(1) 2 3 / 0.4);
-  calc-2: rgb(1 calc(2) 3 / 0.4);
-  calc-3: rgb(1 2 calc(3) / 0.4);
-  calc-4: rgb(1 2 3 / calc(0.4));
-
-  var-1: rgb(var(--foo) 2 3 / 0.4);
-  var-2: rgb(1 var(--foo) 3 / 0.4);
-  var-3: rgb(1 2 var(--foo) / 0.4);
-  var-4: rgb(1 2 3 / var(--foo));
-
-  env-1: rgb(env(--foo) 2 3 / 0.4);
-  env-2: rgb(1 env(--foo) 3 / 0.4);
-  env-3: rgb(1 2 env(--foo) / 0.4);
-  env-4: rgb(1 2 3 / env(--foo));
-
-  min-1: rgb(min(1) 2 3 / 0.4);
-  min-2: rgb(1 min(2) 3 / 0.4);
-  min-3: rgb(1 2 min(3) / 0.4);
-  min-4: rgb(1 2 3 / min(0.4));
-
-  max-1: rgb(max(1) 2 3 / 0.4);
-  max-2: rgb(1 max(2) 3 / 0.4);
-  max-3: rgb(1 2 max(3) / 0.4);
-  max-4: rgb(1 2 3 / max(0.4));
-
-  // var() is substituted before parsing, so it may contain multiple arguments.
-  multi-argument-var-1-of-2: rgb(var(--foo) 2 / 0.4);
-  multi-argument-var-2-of-2: rgb(1 var(--foo) / 0.4);
-  multi-argument-var-1-of-1: rgb(var(--foo) / 0.4);
-}
-
-<===> output.css
-no-alpha {
-  calc-1: rgb(calc(1), 2, 3);
-  calc-2: rgb(1, calc(2), 3);
-  calc-3: rgb(1, 2, calc(3));
-  var-1: rgb(var(--foo), 2, 3);
-  var-2: rgb(1, var(--foo), 3);
-  var-3: rgb(1, 2, var(--foo));
-  env-1: rgb(env(--foo), 2, 3);
-  env-2: rgb(1, env(--foo), 3);
-  env-3: rgb(1, 2, env(--foo));
-  min-1: rgb(min(1), 2, 3);
-  min-2: rgb(1, min(2), 3);
-  min-3: rgb(1, 2, min(3));
-  max-1: rgb(max(1), 2, 3);
-  max-2: rgb(1, max(2), 3);
-  max-3: rgb(1, 2, max(3));
-  multi-argument-var-1-of-2: rgb(var(--foo) 2);
-  multi-argument-var-2-of-2: rgb(1 var(--foo));
-  multi-argument-var-1-of-1: rgb(var(--foo));
-}
-
-alpha {
-  calc-1: rgb(calc(1), 2, 3, 0.4);
-  calc-2: rgb(1, calc(2), 3, 0.4);
-  calc-3: rgb(1 2 calc(3)/0.4);
-  calc-4: rgb(1 2 3/calc(0.4));
-  var-1: rgb(var(--foo), 2, 3, 0.4);
-  var-2: rgb(1, var(--foo), 3, 0.4);
-  var-3: rgb(1 2 var(--foo)/0.4);
-  var-4: rgb(1 2 3/var(--foo));
-  env-1: rgb(env(--foo), 2, 3, 0.4);
-  env-2: rgb(1, env(--foo), 3, 0.4);
-  env-3: rgb(1 2 env(--foo)/0.4);
-  env-4: rgb(1 2 3/env(--foo));
-  min-1: rgb(min(1), 2, 3, 0.4);
-  min-2: rgb(1, min(2), 3, 0.4);
-  min-3: rgb(1 2 min(3)/0.4);
-  min-4: rgb(1 2 3/min(0.4));
-  max-1: rgb(max(1), 2, 3, 0.4);
-  max-2: rgb(1, max(2), 3, 0.4);
-  max-3: rgb(1 2 max(3)/0.4);
-  max-4: rgb(1 2 3/max(0.4));
-  multi-argument-var-1-of-2: rgb(var(--foo) 2/0.4);
-  multi-argument-var-2-of-2: rgb(1 var(--foo)/0.4);
-  multi-argument-var-1-of-1: rgb(var(--foo)/0.4);
+- sass/libsass#2726
+
+<===>
+================================================================================
+<===> no_alpha/calc/arg_1/input.scss
+a {b: rgb(calc(1) 2 3)}
+
+<===> no_alpha/calc/arg_1/output.css
+a {
+  b: rgb(calc(1), 2, 3);
+}
+
+<===>
+================================================================================
+<===> no_alpha/calc/arg_2/input.scss
+a {b: rgb(1 calc(2) 3)}
+
+<===> no_alpha/calc/arg_2/output.css
+a {
+  b: rgb(1, calc(2), 3);
+}
+
+<===>
+================================================================================
+<===> no_alpha/calc/arg_3/input.scss
+a {b: rgb(1 2 calc(3))}
+
+<===> no_alpha/calc/arg_3/output.css
+a {
+  b: rgb(1, 2, calc(3));
+}
+
+<===>
+================================================================================
+<===> no_alpha/var/arg_1/input.scss
+a {b: rgb(var(--foo) 2 3)}
+
+<===> no_alpha/var/arg_1/output.css
+a {
+  b: rgb(var(--foo), 2, 3);
+}
+
+<===>
+================================================================================
+<===> no_alpha/var/arg_2/input.scss
+a {b: rgb(1 var(--foo) 3)}
+
+<===> no_alpha/var/arg_2/output.css
+a {
+  b: rgb(1, var(--foo), 3);
+}
+
+<===>
+================================================================================
+<===> no_alpha/var/arg_3/input.scss
+a {b: rgb(1 2 var(--foo))}
+
+<===> no_alpha/var/arg_3/output.css
+a {
+  b: rgb(1, 2, var(--foo));
+}
+
+<===>
+================================================================================
+<===> no_alpha/env/arg_1/input.scss
+a {b: rgb(env(--foo) 2 3)}
+
+<===> no_alpha/env/arg_1/output.css
+a {
+  b: rgb(env(--foo), 2, 3);
+}
+
+<===>
+================================================================================
+<===> no_alpha/env/arg_2/input.scss
+a {b: rgb(1 env(--foo) 3)}
+
+<===> no_alpha/env/arg_2/output.css
+a {
+  b: rgb(1, env(--foo), 3);
+}
+
+<===>
+================================================================================
+<===> no_alpha/env/arg_3/input.scss
+a {b: rgb(1 2 env(--foo))}
+
+<===> no_alpha/env/arg_3/output.css
+a {
+  b: rgb(1, 2, env(--foo));
+}
+
+<===>
+================================================================================
+<===> no_alpha/min/arg_1/input.scss
+a {b: rgb(min(1) 2 3)}
+
+<===> no_alpha/min/arg_1/output.css
+a {
+  b: rgb(min(1), 2, 3);
+}
+
+<===>
+================================================================================
+<===> no_alpha/min/arg_2/input.scss
+a {b: rgb(1 min(2) 3)}
+
+<===> no_alpha/min/arg_2/output.css
+a {
+  b: rgb(1, min(2), 3);
+}
+
+<===>
+================================================================================
+<===> no_alpha/min/arg_3/input.scss
+a {b: rgb(1 2 min(3))}
+
+<===> no_alpha/min/arg_3/output.css
+a {
+  b: rgb(1, 2, min(3));
+}
+
+<===>
+================================================================================
+<===> no_alpha/max/arg_1/input.scss
+a {b: rgb(max(1) 2 3)}
+
+<===> no_alpha/max/arg_1/output.css
+a {
+  b: rgb(max(1), 2, 3);
+}
+
+<===>
+================================================================================
+<===> no_alpha/max/arg_2/input.scss
+a {b: rgb(1 max(2) 3)}
+
+<===> no_alpha/max/arg_2/output.css
+a {
+  b: rgb(1, max(2), 3);
+}
+
+<===>
+================================================================================
+<===> no_alpha/max/arg_3/input.scss
+a {b: rgb(1 2 max(3))}
+
+<===> no_alpha/max/arg_3/output.css
+a {
+  b: rgb(1, 2, max(3));
+}
+
+<===>
+================================================================================
+<===> no_alpha/multi_argument_var/1_of_2/input.scss
+// var() is substituted before parsing, so it may contain multiple arguments.
+a {b: rgb(var(--foo) 2)}
+
+<===> no_alpha/multi_argument_var/1_of_2/output.css
+a {
+  b: rgb(var(--foo) 2);
+}
+
+<===>
+================================================================================
+<===> no_alpha/multi_argument_var/2_of_2/input.scss
+a {b: rgb(1 var(--foo))}
+
+<===> no_alpha/multi_argument_var/2_of_2/output.css
+a {
+  b: rgb(1 var(--foo));
+}
+
+<===>
+================================================================================
+<===> no_alpha/multi_argument_var/1_of_1/input.scss
+a {b: rgb(var(--foo))}
+
+<===> no_alpha/multi_argument_var/1_of_1/output.css
+a {
+  b: rgb(var(--foo));
+}
+
+<===>
+================================================================================
+<===> alpha/calc/arg_1/input.scss
+a {b: rgb(calc(1) 2 3 / 0.4)}
+
+<===> alpha/calc/arg_1/output.css
+a {
+  b: rgb(calc(1), 2, 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/calc/arg_2/input.scss
+a {b: rgb(1 calc(2) 3 / 0.4)}
+
+<===> alpha/calc/arg_2/output.css
+a {
+  b: rgb(1, calc(2), 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/calc/arg_3/input.scss
+a {b: rgb(1 2 calc(3) / 0.4)}
+
+<===> alpha/calc/arg_3/output.css
+a {
+  b: rgb(1 2 calc(3)/0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/calc/arg_4/input.scss
+a {b: rgb(1 2 3 / calc(0.4))}
+
+<===> alpha/calc/arg_4/output.css
+a {
+  b: rgb(1 2 3/calc(0.4));
+}
+
+<===>
+================================================================================
+<===> alpha/var/arg_1/input.scss
+a {b: rgb(var(--foo) 2 3 / 0.4)}
+
+<===> alpha/var/arg_1/output.css
+a {
+  b: rgb(var(--foo), 2, 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/var/arg_2/input.scss
+a {b: rgb(1 var(--foo) 3 / 0.4)}
+
+<===> alpha/var/arg_2/output.css
+a {
+  b: rgb(1, var(--foo), 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/var/arg_3/input.scss
+a {b: rgb(1 2 var(--foo) / 0.4)}
+
+<===> alpha/var/arg_3/output.css
+a {
+  b: rgb(1 2 var(--foo)/0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/var/arg_4/input.scss
+a {b: rgb(1 2 3 / var(--foo))}
+
+<===> alpha/var/arg_4/output.css
+a {
+  b: rgb(1 2 3/var(--foo));
+}
+
+<===>
+================================================================================
+<===> alpha/env/arg_1/input.scss
+a {b: rgb(env(--foo) 2 3 / 0.4)}
+
+<===> alpha/env/arg_1/output.css
+a {
+  b: rgb(env(--foo), 2, 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/env/arg_2/input.scss
+a {b: rgb(1 env(--foo) 3 / 0.4)}
+
+<===> alpha/env/arg_2/output.css
+a {
+  b: rgb(1, env(--foo), 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/env/arg_3/input.scss
+a {b: rgb(1 2 env(--foo) / 0.4)}
+
+<===> alpha/env/arg_3/output.css
+a {
+  b: rgb(1 2 env(--foo)/0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/env/arg_4/input.scss
+a {b: rgb(1 2 3 / env(--foo))}
+
+<===> alpha/env/arg_4/output.css
+a {
+  b: rgb(1 2 3/env(--foo));
+}
+
+<===>
+================================================================================
+<===> alpha/min/arg_1/input.scss
+a {b: rgb(min(1) 2 3 / 0.4)}
+
+<===> alpha/min/arg_1/output.css
+a {
+  b: rgb(min(1), 2, 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/min/arg_2/input.scss
+a {b: rgb(1 min(2) 3 / 0.4)}
+
+<===> alpha/min/arg_2/output.css
+a {
+  b: rgb(1, min(2), 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/min/arg_3/input.scss
+a {b: rgb(1 2 min(3) / 0.4)}
+
+<===> alpha/min/arg_3/output.css
+a {
+  b: rgb(1 2 min(3)/0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/min/arg_4/input.scss
+a {b: rgb(1 2 3 / min(0.4))}
+
+<===> alpha/min/arg_4/output.css
+a {
+  b: rgb(1 2 3/min(0.4));
+}
+
+<===>
+================================================================================
+<===> alpha/max/arg_1/input.scss
+a {b: rgb(max(1) 2 3 / 0.4)}
+
+<===> alpha/max/arg_1/output.css
+a {
+  b: rgb(max(1), 2, 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/max/arg_2/input.scss
+a {b: rgb(1 max(2) 3 / 0.4)}
+
+<===> alpha/max/arg_2/output.css
+a {
+  b: rgb(1, max(2), 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/max/arg_3/input.scss
+a {b: rgb(1 2 max(3) / 0.4)}
+
+<===> alpha/max/arg_3/output.css
+a {
+  b: rgb(1 2 max(3)/0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/max/arg_4/input.scss
+a {b: rgb(1 2 3 / max(0.4))}
+
+<===> alpha/max/arg_4/output.css
+a {
+  b: rgb(1 2 3/max(0.4));
+}
+
+<===>
+================================================================================
+<===> alpha/multi_argument_var/1_of_2/input.scss
+// var() is substituted before parsing, so it may contain multiple arguments.
+a {b: rgb(var(--foo) 2 / 0.4)}
+
+<===> alpha/multi_argument_var/1_of_2/output.css
+a {
+  b: rgb(var(--foo) 2/0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/multi_argument_var/2_of_2/input.scss
+a {b: rgb(1 var(--foo) / 0.4)}
+
+<===> alpha/multi_argument_var/2_of_2/output.css
+a {
+  b: rgb(1 var(--foo)/0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/multi_argument_var/1_of_1/input.scss
+a {b: rgb(var(--foo) / 0.4)}
+
+<===> alpha/multi_argument_var/1_of_1/output.css
+a {
+  b: rgb(var(--foo)/0.4);
 }
diff --git a/spec/core_functions/color/rgb/three_args/basic.hrx b/spec/core_functions/color/rgb/three_args/basic.hrx
deleted file mode 100644
index 2d1bdde72d..0000000000
--- a/spec/core_functions/color/rgb/three_args/basic.hrx
+++ /dev/null
@@ -1,56 +0,0 @@
-<===> input.scss
-// Channels may be specified as unitless numbers between 0 and 255.
-unitless {
-  numbers: rgb(18, 52, 86);
-  beaded: rgb(190, 173, 237);
-  springgreen: rgb(0, 255, 127);
-  named: rgb($red: 0, $green: 255, $blue: 127);
-
-  // Channels that are out of bounds are clamped within bounds.
-  clamped {
-    red: rgb(256, 0, 0);
-    green: rgb(0, -1, 0);
-    blue: rgb(0, 0, 9999);
-  }
-}
-
-// Channels may also be specified as percents between 0% and 100%, which may be
-// mixed with unitless numbers.
-percents {
-  all-percent: rgb(7.1%, 20.4%, 33.9%);
-  unitless-green: rgb(74.7%, 173, 93%);
-  percent-green: rgb(190, 68%, 237);
-  boundaries: rgb(0%, 100%, 50%);
-
-  // Channels that are out of bounds are clamped within bounds.
-  clamped {
-    red: rgb(100.1%, 0, 0);
-    green: rgb(0, -0.1%, 0);
-    blue: rgb(0, 0, 200%);
-  }
-}
-
-<===> output.css
-unitless {
-  numbers: #123456;
-  beaded: #beaded;
-  springgreen: springgreen;
-  named: springgreen;
-}
-unitless clamped {
-  red: red;
-  green: black;
-  blue: blue;
-}
-
-percents {
-  all-percent: #123456;
-  unitless-green: #beaded;
-  percent-green: #beaded;
-  boundaries: #00ff80;
-}
-percents clamped {
-  red: red;
-  green: black;
-  blue: blue;
-}
diff --git a/spec/core_functions/color/rgb/three_args/percents.hrx b/spec/core_functions/color/rgb/three_args/percents.hrx
new file mode 100644
index 0000000000..41a29c3251
--- /dev/null
+++ b/spec/core_functions/color/rgb/three_args/percents.hrx
@@ -0,0 +1,81 @@
+<===>
+================================================================================
+<===> README.md
+Channels may also be specified as percents between 0% and 100%, which may be
+mixed with unitless numbers.
+
+<===>
+================================================================================
+<===> all/percent/input.scss
+a {b: rgb(7.1%, 20.4%, 33.9%)}
+
+<===> all/percent/output.css
+a {
+  b: #123456;
+}
+
+<===>
+================================================================================
+<===> unitless/green/input.scss
+a {b: rgb(74.7%, 173, 93%)}
+
+<===> unitless/green/output.css
+a {
+  b: #beaded;
+}
+
+<===>
+================================================================================
+<===> percent/green/input.scss
+a {b: rgb(190, 68%, 237)}
+
+<===> percent/green/output.css
+a {
+  b: #beaded;
+}
+
+<===>
+================================================================================
+<===> boundaries/input.scss
+a {b: rgb(0%, 100%, 50%)}
+
+<===> boundaries/output.css
+a {
+  b: #00ff80;
+}
+
+<===>
+================================================================================
+<===> clamped/README.md
+Channels that are out of bounds are clamped within bounds.
+
+<===>
+================================================================================
+<===> clamped/red/input.scss
+a {b: rgb(100.1%, 0, 0)}
+
+<===> clamped/red/output.css
+a {
+  b: red;
+}
+
+<===>
+================================================================================
+<===> clamped/green/input.scss
+a {b: rgb(0, -0.1%, 0)}
+
+<===> clamped/green/output.css
+a {
+  b: black;
+}
+
+<===>
+================================================================================
+<===> clamped/blue/input.scss
+a {b: rgb(0, 0, 200%)}
+
+<===> clamped/blue/output.css
+a {
+  b: blue;
+}
+
diff --git a/spec/core_functions/color/rgb/three_args/special_functions.hrx b/spec/core_functions/color/rgb/three_args/special_functions.hrx
index d8c8634075..73a1581ec8 100644
--- a/spec/core_functions/color/rgb/three_args/special_functions.hrx
+++ b/spec/core_functions/color/rgb/three_args/special_functions.hrx
@@ -1,46 +1,155 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2726
+- sass/libsass#2726
 
-<===> input.scss
+<===>
+================================================================================
+<===> calc/arg_1/input.scss
+a {b: rgb(calc(1), 2, 3)}
+
+<===> calc/arg_1/output.css
+a {
+  b: rgb(calc(1), 2, 3);
+}
+
+<===>
+================================================================================
+<===> calc/arg_2/input.scss
+a {b: rgb(1, calc(2), 3)}
+
+<===> calc/arg_2/output.css
+a {
+  b: rgb(1, calc(2), 3);
+}
+
+<===>
+================================================================================
+<===> calc/arg_3/input.scss
+a {b: rgb(1, 2, calc(3))}
+
+<===> calc/arg_3/output.css
+a {
+  b: rgb(1, 2, calc(3));
+}
+
+<===>
+================================================================================
+<===> var/arg_1/input.scss
+a {b: rgb(var(--foo), 2, 3)}
+
+<===> var/arg_1/output.css
 a {
-  calc-1: rgb(calc(1), 2, 3);
-  calc-2: rgb(1, calc(2), 3);
-  calc-3: rgb(1, 2, calc(3));
+  b: rgb(var(--foo), 2, 3);
+}
 
-  var-1: rgb(var(--foo), 2, 3);
-  var-2: rgb(1, var(--foo), 3);
-  var-3: rgb(1, 2, var(--foo));
+<===>
+================================================================================
+<===> var/arg_2/input.scss
+a {b: rgb(1, var(--foo), 3)}
 
-  env-1: rgb(env(--foo), 2, 3);
-  env-2: rgb(1, env(--foo), 3);
-  env-3: rgb(1, 2, env(--foo));
+<===> var/arg_2/output.css
+a {
+  b: rgb(1, var(--foo), 3);
+}
 
-  min-1: rgb(min(1), 2, 3);
-  min-2: rgb(1, min(2), 3);
-  min-3: rgb(1, 2, min(3));
+<===>
+================================================================================
+<===> var/arg_3/input.scss
+a {b: rgb(1, 2, var(--foo))}
 
-  max-1: rgb(max(1), 2, 3);
-  max-2: rgb(1, max(2), 3);
-  max-3: rgb(1, 2, max(3));
+<===> var/arg_3/output.css
+a {
+  b: rgb(1, 2, var(--foo));
 }
 
-<===> output.css
+<===>
+================================================================================
+<===> env/arg_1/input.scss
+a {b: rgb(env(--foo), 2, 3)}
+
+<===> env/arg_1/output.css
+a {
+  b: rgb(env(--foo), 2, 3);
+}
+
+<===>
+================================================================================
+<===> env/arg_2/input.scss
+a {b: rgb(1, env(--foo), 3)}
+
+<===> env/arg_2/output.css
+a {
+  b: rgb(1, env(--foo), 3);
+}
+
+<===>
+================================================================================
+<===> env/arg_3/input.scss
+a {b: rgb(1, 2, env(--foo))}
+
+<===> env/arg_3/output.css
 a {
-  calc-1: rgb(calc(1), 2, 3);
-  calc-2: rgb(1, calc(2), 3);
-  calc-3: rgb(1, 2, calc(3));
-  var-1: rgb(var(--foo), 2, 3);
-  var-2: rgb(1, var(--foo), 3);
-  var-3: rgb(1, 2, var(--foo));
-  env-1: rgb(env(--foo), 2, 3);
-  env-2: rgb(1, env(--foo), 3);
-  env-3: rgb(1, 2, env(--foo));
-  min-1: rgb(min(1), 2, 3);
-  min-2: rgb(1, min(2), 3);
-  min-3: rgb(1, 2, min(3));
-  max-1: rgb(max(1), 2, 3);
-  max-2: rgb(1, max(2), 3);
-  max-3: rgb(1, 2, max(3));
+  b: rgb(1, 2, env(--foo));
 }
+
+<===>
+================================================================================
+<===> min/arg_1/input.scss
+a {b: rgb(min(1), 2, 3)}
+
+<===> min/arg_1/output.css
+a {
+  b: rgb(min(1), 2, 3);
+}
+
+<===>
+================================================================================
+<===> min/arg_2/input.scss
+a {b: rgb(1, min(2), 3)}
+
+<===> min/arg_2/output.css
+a {
+  b: rgb(1, min(2), 3);
+}
+
+<===>
+================================================================================
+<===> min/arg_3/input.scss
+a {b: rgb(1, 2, min(3))}
+
+<===> min/arg_3/output.css
+a {
+  b: rgb(1, 2, min(3));
+}
+
+<===>
+================================================================================
+<===> max/arg_1/input.scss
+a {b: rgb(max(1), 2, 3)}
+
+<===> max/arg_1/output.css
+a {
+  b: rgb(max(1), 2, 3);
+}
+
+<===>
+================================================================================
+<===> max/arg_2/input.scss
+a {b: rgb(1, max(2), 3)}
+
+<===> max/arg_2/output.css
+a {
+  b: rgb(1, max(2), 3);
+}
+
+<===>
+================================================================================
+<===> max/arg_3/input.scss
+a {b: rgb(1, 2, max(3))}
+
+<===> max/arg_3/output.css
+a {
+  b: rgb(1, 2, max(3));
+}
+
diff --git a/spec/core_functions/color/rgb/three_args/unitless.hrx b/spec/core_functions/color/rgb/three_args/unitless.hrx
new file mode 100644
index 0000000000..a67b265f1c
--- /dev/null
+++ b/spec/core_functions/color/rgb/three_args/unitless.hrx
@@ -0,0 +1,77 @@
+<===> README.md
+Channels may be specified as unitless numbers between 0 and 255.
+
+<===>
+================================================================================
+<===> numbers/input.scss
+a {b: rgb(18, 52, 86)}
+
+<===> numbers/output.css
+a {
+  b: #123456;
+}
+
+<===>
+================================================================================
+<===> beaded/input.scss
+a {b: rgb(190, 173, 237)}
+
+<===> beaded/output.css
+a {
+  b: #beaded;
+}
+
+<===>
+================================================================================
+<===> springgreen/input.scss
+a {b: rgb(0, 255, 127)}
+
+<===> springgreen/output.css
+a {
+  b: springgreen;
+}
+
+<===>
+================================================================================
+<===> named/input.scss
+a {b: rgb($red: 0, $green: 255, $blue: 127)}
+
+<===> named/output.css
+a {
+  b: springgreen;
+}
+
+<===>
+================================================================================
+<===> clamped/README.md
+Channels that are out of bounds are clamped within bounds.
+
+<===>
+================================================================================
+<===> clamped/red/input.scss
+a {b: rgb(256, 0, 0)}
+
+<===> clamped/red/output.css
+a {
+  b: red;
+}
+
+<===>
+================================================================================
+<===> clamped/green/input.scss
+a {b: rgb(0, -1, 0)}
+
+<===> clamped/green/output.css
+a {
+  b: black;
+}
+
+<===>
+================================================================================
+<===> clamped/blue/input.scss
+a {b: rgb(0, 0, 9999)}
+
+<===> clamped/blue/output.css
+a {
+  b: blue;
+}
diff --git a/spec/core_functions/color/rgb/two_args.hrx b/spec/core_functions/color/rgb/two_args.hrx
index 2b9ea2f724..b1967ad892 100644
--- a/spec/core_functions/color/rgb/two_args.hrx
+++ b/spec/core_functions/color/rgb/two_args.hrx
@@ -1,61 +1,125 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2722
+- sass/libsass#2722
 
-<===> input.scss
-opaque-to {
-  opaque: rgb(#123, 1);
-  partial: rgb(#123, 0.5);
-  transparent: rgb(#123, 0);
+<===>
+================================================================================
+<===> opaque_to/opaque/input.scss
+a {b: rgb(#123, 1)}
+
+<===> opaque_to/opaque/output.css
+a {
+  b: #112233;
 }
 
-partial-to {
-  $color: rgb(0, 0, 255, 0.3);
-  opaque: rgb($color, 1);
-  partial: rgb($color, 0.5);
-  transparent: rgb($color, 0);
+<===>
+================================================================================
+<===> opaque_to/partial/input.scss
+a {b: rgb(#123, 0.5)}
+
+<===> opaque_to/partial/output.css
+a {
+  b: rgba(17, 34, 51, 0.5);
 }
 
-transparent-to {
-  opaque: rgb(transparent, 1);
-  partial: rgb(transparent, 0.5);
-  transparent: rgb(transparent, 0);
+<===>
+================================================================================
+<===> opaque_to/transparent/input.scss
+a {b: rgb(#123, 0)}
+
+<===> opaque_to/transparent/output.css
+a {
+  b: rgba(17, 34, 51, 0);
 }
 
-clamped {
-  opaque: rgb(#123, 1.1);
-  transparent: rgb(#123, -0.1);
+<===>
+================================================================================
+<===> partial_to/opaque/input.scss
+a {b: rgb(rgba(0, 0, 255, 0.3), 1)}
+
+<===> partial_to/opaque/output.css
+a {
+  b: blue;
 }
 
-named {
-  x: rgb($color: #123, $alpha: 0.5);
+<===>
+================================================================================
+<===> partial_to/partial/input.scss
+a {b: rgb(rgba(0, 0, 255, 0.3), 0.5)}
+
+<===> partial_to/partial/output.css
+a {
+  b: rgba(0, 0, 255, 0.5);
 }
 
-<===> output.css
-opaque-to {
-  opaque: #112233;
-  partial: rgba(17, 34, 51, 0.5);
-  transparent: rgba(17, 34, 51, 0);
+<===>
+================================================================================
+<===> partial_to/transparent/input.scss
+a {b: rgb(rgba(0, 0, 255, 0.3), 0)}
+
+<===> partial_to/transparent/output.css
+a {
+  b: rgba(0, 0, 255, 0);
 }
 
-partial-to {
-  opaque: blue;
-  partial: rgba(0, 0, 255, 0.5);
-  transparent: rgba(0, 0, 255, 0);
+<===>
+================================================================================
+<===> transparent_to/opaque/input.scss
+a {b: rgb(transparent, 1)}
+
+<===> transparent_to/opaque/output.css
+a {
+  b: black;
 }
 
-transparent-to {
-  opaque: black;
-  partial: rgba(0, 0, 0, 0.5);
-  transparent: rgba(0, 0, 0, 0);
+<===>
+================================================================================
+<===> transparent_to/partial/input.scss
+a {b: rgb(transparent, 0.5)}
+
+<===> transparent_to/partial/output.css
+a {
+  b: rgba(0, 0, 0, 0.5);
 }
 
-clamped {
-  opaque: #112233;
-  transparent: rgba(17, 34, 51, 0);
+<===>
+================================================================================
+<===> transparent_to/transparent/input.scss
+a {b: rgb(transparent, 0)}
+
+<===> transparent_to/transparent/output.css
+a {
+  b: rgba(0, 0, 0, 0);
 }
 
-named {
-  x: rgba(17, 34, 51, 0.5);
+<===>
+================================================================================
+<===> clamped/opaque/input.scss
+a {b: rgb(#123, 1.1)}
+
+<===> clamped/opaque/output.css
+a {
+  b: #112233;
+}
+
+<===>
+================================================================================
+<===> clamped/transparent/input.scss
+a {b: rgb(#123, -0.1)}
+
+<===> clamped/transparent/output.css
+a {
+  b: rgba(17, 34, 51, 0);
 }
+
+<===>
+================================================================================
+<===> named/input.scss
+a {b: rgb($color: #123, $alpha: 0.5)}
+
+<===> named/output.css
+a {
+  b: rgba(17, 34, 51, 0.5);
+}
+
diff --git a/spec/core_functions/color/rgba/error/one_arg.hrx b/spec/core_functions/color/rgba/error/one_arg.hrx
index 53a6b5f3bf..7112fa7ed7 100644
--- a/spec/core_functions/color/rgba/error/one_arg.hrx
+++ b/spec/core_functions/color/rgba/error/one_arg.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2722
+- sass/libsass#2722
 
 <===>
 ================================================================================
diff --git a/spec/core_functions/color/rgba/error/three_args.hrx b/spec/core_functions/color/rgba/error/three_args.hrx
index 660536468a..dc799f13e3 100644
--- a/spec/core_functions/color/rgba/error/three_args.hrx
+++ b/spec/core_functions/color/rgba/error/three_args.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2722
+- sass/libsass#2722
 
 <===>
 ================================================================================
diff --git a/spec/core_functions/color/rgba/four_args/alpha_percent.hrx b/spec/core_functions/color/rgba/four_args/alpha_percent.hrx
deleted file mode 100644
index a350474ef5..0000000000
--- a/spec/core_functions/color/rgba/four_args/alpha_percent.hrx
+++ /dev/null
@@ -1,22 +0,0 @@
-<===> options.yml
----
-:todo:
-- libsass # sass/libsass#2719
-
-<===> input.scss
-.alpha-percent {
-  negative: rgba(0, 0, 0, -10%);
-  min: rgba(0, 0, 0, 0%);
-  positive: rgba(0, 0, 0, 45.6%);
-  max: rgba(0, 0, 0, 100%);
-  above-max: rgba(0, 0, 0, 250%);
-}
-
-<===> output.css
-.alpha-percent {
-  negative: rgba(0, 0, 0, 0);
-  min: rgba(0, 0, 0, 0);
-  positive: rgba(0, 0, 0, 0.456);
-  max: black;
-  above-max: black;
-}
diff --git a/spec/core_functions/color/rgba/four_args/alpha_unitless.hrx b/spec/core_functions/color/rgba/four_args/alpha_unitless.hrx
deleted file mode 100644
index 3f56394022..0000000000
--- a/spec/core_functions/color/rgba/four_args/alpha_unitless.hrx
+++ /dev/null
@@ -1,17 +0,0 @@
-<===> input.scss
-.alpha-unitless {
-  negative: rgba(0, 0, 0, -10);
-  min: rgba(0, 0, 0, 0);
-  positive: rgba(0, 0, 0, 0.456);
-  max: rgba(0, 0, 0, 1);
-  above-max: rgba(0, 0, 0, 250);
-}
-
-<===> output.css
-.alpha-unitless {
-  negative: rgba(0, 0, 0, 0);
-  min: rgba(0, 0, 0, 0);
-  positive: rgba(0, 0, 0, 0.456);
-  max: black;
-  above-max: black;
-}
diff --git a/spec/core_functions/color/rgba/four_args/basic.hrx b/spec/core_functions/color/rgba/four_args/basic.hrx
deleted file mode 100644
index 993004619a..0000000000
--- a/spec/core_functions/color/rgba/four_args/basic.hrx
+++ /dev/null
@@ -1,32 +0,0 @@
-<===> input.scss
-basic {
-  transparent: rgba(0, 255, 127, 0);
-  opaque: rgba(190, 173, 237, 1);
-  partial: rgba(18, 52, 86, 0.5);
-  named: rgba($red: 0, $green: 255, $blue: 127, $alpha: 0.3);
-}
-
-// Channels that are out of bounds are clamped within bounds.
-clamped {
-  red: rgba(256, 0, 0, 0.5);
-  green: rgba(0, -1, 0, 0.5);
-  blue: rgba(0, 0, 9999, 0.5);
-  alpha-above: rgba(0, 0, 0, 1.1);
-  alpha-below: rgba(0, 0, 0, -0.1);
-}
-
-<===> output.css
-basic {
-  transparent: rgba(0, 255, 127, 0);
-  opaque: #beaded;
-  partial: rgba(18, 52, 86, 0.5);
-  named: rgba(0, 255, 127, 0.3);
-}
-
-clamped {
-  red: rgba(255, 0, 0, 0.5);
-  green: rgba(0, 0, 0, 0.5);
-  blue: rgba(0, 0, 255, 0.5);
-  alpha-above: black;
-  alpha-below: rgba(0, 0, 0, 0);
-}
diff --git a/spec/core_functions/color/rgba/four_args/clamped.hrx b/spec/core_functions/color/rgba/four_args/clamped.hrx
new file mode 100644
index 0000000000..493c86636b
--- /dev/null
+++ b/spec/core_functions/color/rgba/four_args/clamped.hrx
@@ -0,0 +1,53 @@
+<===> README.md
+Channels that are out of bounds are clamped within bounds.
+
+<===>
+================================================================================
+<===> red/input.scss
+a {b: rgba(256, 0, 0, 0.5)}
+
+<===> red/output.css
+a {
+  b: rgba(255, 0, 0, 0.5);
+}
+
+<===>
+================================================================================
+<===> green/input.scss
+a {b: rgba(0, -1, 0, 0.5)}
+
+<===> green/output.css
+a {
+  b: rgba(0, 0, 0, 0.5);
+}
+
+<===>
+================================================================================
+<===> blue/input.scss
+a {b: rgba(0, 0, 9999, 0.5)}
+
+<===> blue/output.css
+a {
+  b: rgba(0, 0, 255, 0.5);
+}
+
+<===>
+================================================================================
+<===> alpha/above/input.scss
+a {b: rgba(0, 0, 0, 1.1)}
+
+<===> alpha/above/output.css
+a {
+  b: black;
+}
+
+<===>
+================================================================================
+<===> alpha/below/input.scss
+a {b: rgba(0, 0, 0, -0.1)}
+
+<===> alpha/below/output.css
+a {
+  b: rgba(0, 0, 0, 0);
+}
+
diff --git a/spec/core_functions/color/rgba/four_args/in_gamut.hrx b/spec/core_functions/color/rgba/four_args/in_gamut.hrx
new file mode 100644
index 0000000000..66e3bcb419
--- /dev/null
+++ b/spec/core_functions/color/rgba/four_args/in_gamut.hrx
@@ -0,0 +1,37 @@
+<===> transparent/input.scss
+a {b: rgba(0, 255, 127, 0)}
+
+<===> transparent/output.css
+a {
+  b: rgba(0, 255, 127, 0);
+}
+
+<===>
+================================================================================
+<===> opaque/input.scss
+a {b: rgba(190, 173, 237, 1)}
+
+<===> opaque/output.css
+a {
+  b: #beaded;
+}
+
+<===>
+================================================================================
+<===> partial/input.scss
+a {b: rgba(18, 52, 86, 0.5)}
+
+<===> partial/output.css
+a {
+  b: rgba(18, 52, 86, 0.5);
+}
+
+<===>
+================================================================================
+<===> named/input.scss
+a {b: rgba($red: 0, $green: 255, $blue: 127, $alpha: 0.3)}
+
+<===> named/output.css
+a {
+  b: rgba(0, 255, 127, 0.3);
+}
diff --git a/spec/core_functions/color/rgba/four_args/special_functions.hrx b/spec/core_functions/color/rgba/four_args/special_functions.hrx
index af072a5c05..2c9b825c9a 100644
--- a/spec/core_functions/color/rgba/four_args/special_functions.hrx
+++ b/spec/core_functions/color/rgba/four_args/special_functions.hrx
@@ -1,65 +1,245 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2726
-
-<===> input.scss
-a {
-  calc-1: rgba(calc(1), 2, 3, 0.4);
-  calc-2: rgba(1, calc(2), 3, 0.4);
-  calc-3: rgba(1, 2, calc(3), 0.4);
-  calc-4: rgba(1, 2, 3, calc(0.4));
-
-  var-1: rgba(var(--foo), 2, 3, 0.4);
-  var-2: rgba(1, var(--foo), 3, 0.4);
-  var-3: rgba(1, 2, var(--foo), 0.4);
-  var-4: rgba(1, 2, 3, var(--foo));
-
-  env-1: rgba(env(--foo), 2, 3, 0.4);
-  env-2: rgba(1, env(--foo), 3, 0.4);
-  env-3: rgba(1, 2, env(--foo), 0.4);
-  env-4: rgba(1, 2, 3, env(--foo));
-
-  min-1: rgba(min(1), 2, 3, 0.4);
-  min-2: rgba(1, min(2), 3, 0.4);
-  min-3: rgba(1, 2, min(3), 0.4);
-  min-4: rgba(1, 2, 3, min(0.4));
-
-  max-1: rgba(max(1), 2, 3, 0.4);
-  max-2: rgba(1, max(2), 3, 0.4);
-  max-3: rgba(1, 2, max(3), 0.4);
-  max-4: rgba(1, 2, 3, max(0.4));
-
-  calc-2-args: rgba(blue, calc(0.4));
-  var-2-args-alpha: rgba(blue, var(--foo));
-  var-2-args-color: rgba(var(--foo), 0.4);
-  var-2-args-both: rgba(var(--foo), var(--foo));
-}
-
-<===> output.css
-a {
-  calc-1: rgba(calc(1), 2, 3, 0.4);
-  calc-2: rgba(1, calc(2), 3, 0.4);
-  calc-3: rgba(1, 2, calc(3), 0.4);
-  calc-4: rgba(1, 2, 3, calc(0.4));
-  var-1: rgba(var(--foo), 2, 3, 0.4);
-  var-2: rgba(1, var(--foo), 3, 0.4);
-  var-3: rgba(1, 2, var(--foo), 0.4);
-  var-4: rgba(1, 2, 3, var(--foo));
-  env-1: rgba(env(--foo), 2, 3, 0.4);
-  env-2: rgba(1, env(--foo), 3, 0.4);
-  env-3: rgba(1, 2, env(--foo), 0.4);
-  env-4: rgba(1, 2, 3, env(--foo));
-  min-1: rgba(min(1), 2, 3, 0.4);
-  min-2: rgba(1, min(2), 3, 0.4);
-  min-3: rgba(1, 2, min(3), 0.4);
-  min-4: rgba(1, 2, 3, min(0.4));
-  max-1: rgba(max(1), 2, 3, 0.4);
-  max-2: rgba(1, max(2), 3, 0.4);
-  max-3: rgba(1, 2, max(3), 0.4);
-  max-4: rgba(1, 2, 3, max(0.4));
-  calc-2-args: rgba(0, 0, 255, calc(0.4));
-  var-2-args-alpha: rgba(0, 0, 255, var(--foo));
-  var-2-args-color: rgba(var(--foo), 0.4);
-  var-2-args-both: rgba(var(--foo), var(--foo));
+- sass/libsass#2726
+
+<===>
+================================================================================
+<===> calc/arg_1/input.scss
+a {b: rgba(calc(1), 2, 3, 0.4)}
+
+<===> calc/arg_1/output.css
+a {
+  b: rgba(calc(1), 2, 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> calc/arg_2/input.scss
+a {b: rgba(1, calc(2), 3, 0.4)}
+
+<===> calc/arg_2/output.css
+a {
+  b: rgba(1, calc(2), 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> calc/arg_3/input.scss
+a {b: rgba(1, 2, calc(3), 0.4)}
+
+<===> calc/arg_3/output.css
+a {
+  b: rgba(1, 2, calc(3), 0.4);
+}
+
+<===>
+================================================================================
+<===> calc/arg_4/input.scss
+a {b: rgba(1, 2, 3, calc(0.4))}
+
+<===> calc/arg_4/output.css
+a {
+  b: rgba(1, 2, 3, calc(0.4));
+}
+
+<===>
+================================================================================
+<===> var/arg_1/input.scss
+a {b: rgba(var(--foo), 2, 3, 0.4)}
+
+<===> var/arg_1/output.css
+a {
+  b: rgba(var(--foo), 2, 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> var/arg_2/input.scss
+a {b: rgba(1, var(--foo), 3, 0.4)}
+
+<===> var/arg_2/output.css
+a {
+  b: rgba(1, var(--foo), 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> var/arg_3/input.scss
+a {b: rgba(1, 2, var(--foo), 0.4)}
+
+<===> var/arg_3/output.css
+a {
+  b: rgba(1, 2, var(--foo), 0.4);
+}
+
+<===>
+================================================================================
+<===> var/arg_4/input.scss
+a {b: rgba(1, 2, 3, var(--foo))}
+
+<===> var/arg_4/output.css
+a {
+  b: rgba(1, 2, 3, var(--foo));
+}
+
+<===>
+================================================================================
+<===> env/arg_1/input.scss
+a {b: rgba(env(--foo), 2, 3, 0.4)}
+
+<===> env/arg_1/output.css
+a {
+  b: rgba(env(--foo), 2, 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> env/arg_2/input.scss
+a {b: rgba(1, env(--foo), 3, 0.4)}
+
+<===> env/arg_2/output.css
+a {
+  b: rgba(1, env(--foo), 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> env/arg_3/input.scss
+a {b: rgba(1, 2, env(--foo), 0.4)}
+
+<===> env/arg_3/output.css
+a {
+  b: rgba(1, 2, env(--foo), 0.4);
+}
+
+<===>
+================================================================================
+<===> env/arg_4/input.scss
+a {b: rgba(1, 2, 3, env(--foo))}
+
+<===> env/arg_4/output.css
+a {
+  b: rgba(1, 2, 3, env(--foo));
+}
+
+<===>
+================================================================================
+<===> min/arg_1/input.scss
+a {b: rgba(min(1), 2, 3, 0.4)}
+
+<===> min/arg_1/output.css
+a {
+  b: rgba(min(1), 2, 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> min/arg_2/input.scss
+a {b: rgba(1, min(2), 3, 0.4)}
+
+<===> min/arg_2/output.css
+a {
+  b: rgba(1, min(2), 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> min/arg_3/input.scss
+a {b: rgba(1, 2, min(3), 0.4)}
+
+<===> min/arg_3/output.css
+a {
+  b: rgba(1, 2, min(3), 0.4);
+}
+
+<===>
+================================================================================
+<===> min/arg_4/input.scss
+a {b: rgba(1, 2, 3, min(0.4))}
+
+<===> min/arg_4/output.css
+a {
+  b: rgba(1, 2, 3, min(0.4));
+}
+
+<===>
+================================================================================
+<===> max/arg_1/input.scss
+a {b: rgba(max(1), 2, 3, 0.4)}
+
+<===> max/arg_1/output.css
+a {
+  b: rgba(max(1), 2, 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> max/arg_2/input.scss
+a {b: rgba(1, max(2), 3, 0.4)}
+
+<===> max/arg_2/output.css
+a {
+  b: rgba(1, max(2), 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> max/arg_3/input.scss
+a {b: rgba(1, 2, max(3), 0.4)}
+
+<===> max/arg_3/output.css
+a {
+  b: rgba(1, 2, max(3), 0.4);
+}
+
+<===>
+================================================================================
+<===> max/arg_4/input.scss
+a {b: rgba(1, 2, 3, max(0.4))}
+
+<===> max/arg_4/output.css
+a {
+  b: rgba(1, 2, 3, max(0.4));
+}
+
+<===>
+================================================================================
+<===> calc/arg_2/args/input.scss
+a {b: rgba(blue, calc(0.4))}
+
+<===> calc/arg_2/args/output.css
+a {
+  b: rgba(0, 0, 255, calc(0.4));
+}
+
+<===>
+================================================================================
+<===> var/arg_2/args/alpha/input.scss
+a {b: rgba(blue, var(--foo))}
+
+<===> var/arg_2/args/alpha/output.css
+a {
+  b: rgba(0, 0, 255, var(--foo));
+}
+
+<===>
+================================================================================
+<===> var/arg_2/args/color/input.scss
+a {b: rgba(var(--foo), 0.4)}
+
+<===> var/arg_2/args/color/output.css
+a {
+  b: rgba(var(--foo), 0.4);
+}
+
+<===>
+================================================================================
+<===> var/arg_2/args/both/input.scss
+a {b: rgba(var(--foo), var(--foo))}
+
+<===> var/arg_2/args/both/output.css
+a {
+  b: rgba(var(--foo), var(--foo));
 }
+
diff --git a/spec/core_functions/color/rgba/multi_argument_var.hrx b/spec/core_functions/color/rgba/multi_argument_var.hrx
index a99146d028..9cc1871455 100644
--- a/spec/core_functions/color/rgba/multi_argument_var.hrx
+++ b/spec/core_functions/color/rgba/multi_argument_var.hrx
@@ -3,23 +3,64 @@
 :todo:
 - libsass
 
-<===> input.scss
+<===>
+================================================================================
+<===> 1_of_3/input.scss
+// var() is substituted before parsing, so it may contain multiple arguments.
+a {b: rgba(var(--foo), 3, 0.4)}
+
+<===> 1_of_3/output.css
 a {
-  // var() is substituted before parsing, so it may contain multiple arguments.
   b: rgba(var(--foo), 3, 0.4);
-  b: rgba(1, var(--foo), 0.4);
-  b: rgba(1, 2, var(--foo));
-  b: rgba(var(--foo), 0.4);
-  b: rgba(1, var(--foo));
-  b: rgba(var(--foo));
 }
 
-<===> output.css
+<===>
+================================================================================
+<===> 2_of_3/input.scss
+a {b: rgba(1, var(--foo), 0.4)}
+
+<===> 2_of_3/output.css
 a {
-  b: rgba(var(--foo), 3, 0.4);
   b: rgba(1, var(--foo), 0.4);
+}
+
+<===>
+================================================================================
+<===> 3_of_3/input.scss
+a {b: rgba(1, 2, var(--foo))}
+
+<===> 3_of_3/output.css
+a {
   b: rgba(1, 2, var(--foo));
+}
+
+<===>
+================================================================================
+<===> 1_of_2/input.scss
+a {b: rgba(var(--foo), 0.4)}
+
+<===> 1_of_2/output.css
+a {
   b: rgba(var(--foo), 0.4);
+}
+
+<===>
+================================================================================
+<===> 2_of_2/input.scss
+a {b: rgba(1, var(--foo))}
+
+<===> 2_of_2/output.css
+a {
   b: rgba(1, var(--foo));
+}
+
+<===>
+================================================================================
+<===> 1_of_1/input.scss
+a {b: rgba(var(--foo))}
+
+<===> 1_of_1/output.css
+a {
   b: rgba(var(--foo));
 }
+
diff --git a/spec/core_functions/color/rgba/one_arg/alpha.hrx b/spec/core_functions/color/rgba/one_arg/alpha.hrx
index 24f96898b7..e0959b2160 100644
--- a/spec/core_functions/color/rgba/one_arg/alpha.hrx
+++ b/spec/core_functions/color/rgba/one_arg/alpha.hrx
@@ -1,42 +1,134 @@
-<===> input.scss
-basic {
-  transparent: rgba(0 255 127 / 0);
-  opaque: rgba(190 173 237 / 1);
-  partial: rgba(18 52 86 / 0.5);
-  percent: rgba(18 52 86 / 50%);
-  named: rgba($channels: 0 255 127 / 0.3);
-
-  // Extra parens shouldn't cause the slash to be forced into division.
-  parenthesized: (rgba(0 255 127 / 0.3));
-}
-
-// Channels that are out of bounds are clamped within bounds.
-clamped {
-  red: rgba(256 0 0 / 0.5);
-  green: rgba(0 -1 0 / 0.5);
-  blue: rgba(0 0 9999 / 0.5);
-  alpha-above: rgba(0 0 0 / 1.1);
-  alpha-below: rgba(0 0 0 / -0.1);
-  alpha-above-percent: rgba(0 0 0 / 250%);
-  alpha-below-percent: rgba(0 0 0 / -10%);
-}
-
-<===> output.css
-basic {
-  transparent: rgba(0, 255, 127, 0);
-  opaque: #beaded;
-  partial: rgba(18, 52, 86, 0.5);
-  percent: rgba(18, 52, 86, 0.5);
-  named: rgba(0, 255, 127, 0.3);
-  parenthesized: rgba(0, 255, 127, 0.3);
-}
-
-clamped {
-  red: rgba(255, 0, 0, 0.5);
-  green: rgba(0, 0, 0, 0.5);
-  blue: rgba(0, 0, 255, 0.5);
-  alpha-above: black;
-  alpha-below: rgba(0, 0, 0, 0);
-  alpha-above-percent: black;
-  alpha-below-percent: rgba(0, 0, 0, 0);
+<===> in_gamut/transparent/input.scss
+a {b: rgba(0 255 127 / 0)}
+
+<===> in_gamut/transparent/output.css
+a {
+  b: rgba(0, 255, 127, 0);
+}
+
+<===>
+================================================================================
+<===> in_gamut/opaque/input.scss
+a {b: rgba(190 173 237 / 1)}
+
+<===> in_gamut/opaque/output.css
+a {
+  b: #beaded;
+}
+
+<===>
+================================================================================
+<===> in_gamut/partial/input.scss
+a {b: rgba(18 52 86 / 0.5)}
+
+<===> in_gamut/partial/output.css
+a {
+  b: rgba(18, 52, 86, 0.5);
+}
+
+<===>
+================================================================================
+<===> in_gamut/percent/input.scss
+a {b: rgba(18 52 86 / 50%)}
+
+<===> in_gamut/percent/output.css
+a {
+  b: rgba(18, 52, 86, 0.5);
+}
+
+<===>
+================================================================================
+<===> in_gamut/named/input.scss
+a {b: rgba($channels: 0 255 127 / 0.3)}
+
+<===> in_gamut/named/output.css
+a {
+  b: rgba(0, 255, 127, 0.3);
+}
+
+<===>
+================================================================================
+<===> in_gamut/parenthesized/input.scss
+// Extra parens shouldn't cause the slash to be forced into division.
+a {b: rgba(0 255 127 / 0.3)}
+
+<===> in_gamut/parenthesized/output.css
+a {
+  b: rgba(0, 255, 127, 0.3);
+}
+
+<===>
+================================================================================
+<===> clamped/README.md
+Channels that are out of bounds are clamped within bounds.
+
+<===>
+================================================================================
+<===> clamped/red/input.scss
+a {b: rgba(256 0 0 / 0.5)}
+
+<===> clamped/red/output.css
+a {
+  b: rgba(255, 0, 0, 0.5);
 }
+
+<===>
+================================================================================
+<===> clamped/green/input.scss
+a {b: rgba(0 -1 0 / 0.5)}
+
+<===> clamped/green/output.css
+a {
+  b: rgba(0, 0, 0, 0.5);
+}
+
+<===>
+================================================================================
+<===> clamped/blue/input.scss
+a {b: rgba(0 0 9999 / 0.5)}
+
+<===> clamped/blue/output.css
+a {
+  b: rgba(0, 0, 255, 0.5);
+}
+
+<===>
+================================================================================
+<===> clamped/alpha/above/input.scss
+a {b: rgba(0 0 0 / 1.1)}
+
+<===> clamped/alpha/above/output.css
+a {
+  b: black;
+}
+
+<===>
+================================================================================
+<===> clamped/alpha/below/input.scss
+a {b: rgba(0 0 0 / -0.1)}
+
+<===> clamped/alpha/below/output.css
+a {
+  b: rgba(0, 0, 0, 0);
+}
+
+<===>
+================================================================================
+<===> clamped/alpha/above/percent/input.scss
+a {b: rgba(0 0 0 / 250%)}
+
+<===> clamped/alpha/above/percent/output.css
+a {
+  b: black;
+}
+
+<===>
+================================================================================
+<===> clamped/alpha/below/percent/input.scss
+a {b: rgba(0 0 0 / -10%)}
+
+<===> clamped/alpha/below/percent/output.css
+a {
+  b: rgba(0, 0, 0, 0);
+}
+
diff --git a/spec/core_functions/color/rgba/one_arg/basic.hrx b/spec/core_functions/color/rgba/one_arg/basic.hrx
deleted file mode 100644
index cbc84bcf4d..0000000000
--- a/spec/core_functions/color/rgba/one_arg/basic.hrx
+++ /dev/null
@@ -1,56 +0,0 @@
-<===> input.scss
-// Channels may be specified as unitless numbers between 0 and 255.
-unitless {
-  numbers: rgba(18 52 86);
-  beaded: rgba(190 173 237);
-  springgreen: rgba(0 255 127);
-  named: rgba($channels: 0 255 127);
-
-  // Channels that are out of bounds are clamped within bounds.
-  clamped {
-    red: rgba(256 0 0);
-    green: rgba(0 -1 0);
-    blue: rgba(0 0 9999);
-  }
-}
-
-// Channels may also be specified as percents between 0% and 100%, which may be
-// mixed with unitless numbers.
-percents {
-  all-percent: rgba(7.1% 20.4% 33.9%);
-  unitless-green: rgba(74.7% 173 93%);
-  percent-green: rgba(190 68% 237);
-  boundaries: rgba(0% 100% 50%);
-
-  // Channels that are out of bounds are clamped within bounds.
-  clamped {
-    red: rgba(100.1% 0 0);
-    green: rgba(0 -0.1% 0);
-    blue: rgba(0 0 200%);
-  }
-}
-
-<===> output.css
-unitless {
-  numbers: #123456;
-  beaded: #beaded;
-  springgreen: springgreen;
-  named: springgreen;
-}
-unitless clamped {
-  red: red;
-  green: black;
-  blue: blue;
-}
-
-percents {
-  all-percent: #123456;
-  unitless-green: #beaded;
-  percent-green: #beaded;
-  boundaries: #00ff80;
-}
-percents clamped {
-  red: red;
-  green: black;
-  blue: blue;
-}
diff --git a/spec/core_functions/color/rgba/one_arg/no_alpha.hrx b/spec/core_functions/color/rgba/one_arg/no_alpha.hrx
new file mode 100644
index 0000000000..979ce58834
--- /dev/null
+++ b/spec/core_functions/color/rgba/one_arg/no_alpha.hrx
@@ -0,0 +1,159 @@
+<===> unitless/README.md
+Channels may be specified as unitless numbers between 0 and 255.
+
+<===>
+================================================================================
+<===> unitless/numbers/input.scss
+a {b: rgba(18 52 86)}
+
+<===> unitless/numbers/output.css
+a {
+  b: #123456;
+}
+
+<===>
+================================================================================
+<===> unitless/beaded/input.scss
+a {b: rgba(190 173 237)}
+
+<===> unitless/beaded/output.css
+a {
+  b: #beaded;
+}
+
+<===>
+================================================================================
+<===> unitless/springgreen/input.scss
+a {b: rgba(0 255 127)}
+
+<===> unitless/springgreen/output.css
+a {
+  b: springgreen;
+}
+
+<===>
+================================================================================
+<===> unitless/named/input.scss
+a {b: rgba($channels: 0 255 127)}
+
+<===> unitless/named/output.css
+a {
+  b: springgreen;
+}
+
+<===>
+================================================================================
+<===> unitless/clamped/README.md
+Channels that are out of bounds are clamped within bounds.
+
+<===>
+================================================================================
+<===> unitless/clamped/red/input.scss
+a {b: rgba(256 0 0)}
+
+<===> unitless/clamped/red/output.css
+a {
+  b: red;
+}
+
+<===>
+================================================================================
+<===> unitless/clamped/green/input.scss
+a {b: rgba(0 -1 0)}
+
+<===> unitless/clamped/green/output.css
+a {
+  b: black;
+}
+
+<===>
+================================================================================
+<===> unitless/clamped/blue/input.scss
+a {b: rgba(0 0 9999)}
+
+<===> unitless/clamped/blue/output.css
+a {
+  b: blue;
+}
+
+<===>
+================================================================================
+<===> percents/README.md
+Channels may also be specified as percents between 0% and 100%, which may be
+// mixed with unitless numbers.
+
+<===>
+================================================================================
+<===> percents/all/percent/input.scss
+a {b: rgba(7.1% 20.4% 33.9%)}
+
+<===> percents/all/percent/output.css
+a {
+  b: #123456;
+}
+
+<===>
+================================================================================
+<===> percents/unitless/green/input.scss
+a {b: rgba(74.7% 173 93%)}
+
+<===> percents/unitless/green/output.css
+a {
+  b: #beaded;
+}
+
+<===>
+================================================================================
+<===> percents/percent/green/input.scss
+a {b: rgba(190 68% 237)}
+
+<===> percents/percent/green/output.css
+a {
+  b: #beaded;
+}
+
+<===>
+================================================================================
+<===> percents/boundaries/input.scss
+a {b: rgba(0% 100% 50%)}
+
+<===> percents/boundaries/output.css
+a {
+  b: #00ff80;
+}
+
+<===>
+================================================================================
+<===> percents/clamped/README.md
+Channels that are out of bounds are clamped within bounds.
+
+<===>
+================================================================================
+<===> percents/clamped/red/input.scss
+a {b: rgba(100.1% 0 0)}
+
+<===> percents/clamped/red/output.css
+a {
+  b: red;
+}
+
+<===>
+================================================================================
+<===> percents/clamped/green/input.scss
+a {b: rgba(0 -0.1% 0)}
+
+<===> percents/clamped/green/output.css
+a {
+  b: black;
+}
+
+<===>
+================================================================================
+<===> percents/clamped/blue/input.scss
+a {b: rgba(0 0 200%)}
+
+<===> percents/clamped/blue/output.css
+a {
+  b: blue;
+}
+
diff --git a/spec/core_functions/color/rgba/one_arg/options.yml b/spec/core_functions/color/rgba/one_arg/options.yml
index 076f9d2d59..018b0da451 100644
--- a/spec/core_functions/color/rgba/one_arg/options.yml
+++ b/spec/core_functions/color/rgba/one_arg/options.yml
@@ -1,3 +1,3 @@
 ---
 :todo:
-- libsass # sass/libsass#2722
+- sass/libsass#2722
diff --git a/spec/core_functions/color/rgba/one_arg/special_functions.hrx b/spec/core_functions/color/rgba/one_arg/special_functions.hrx
index 038dbc02da..8a3c4da094 100644
--- a/spec/core_functions/color/rgba/one_arg/special_functions.hrx
+++ b/spec/core_functions/color/rgba/one_arg/special_functions.hrx
@@ -1,112 +1,416 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2726
-
-<===> input.scss
-no-alpha {
-  calc-1: rgba(calc(1) 2 3);
-  calc-2: rgba(1 calc(2) 3);
-  calc-3: rgba(1 2 calc(3));
-
-  var-1: rgba(var(--foo) 2 3);
-  var-2: rgba(1 var(--foo) 3);
-  var-3: rgba(1 2 var(--foo));
-
-  env-1: rgba(env(--foo) 2 3);
-  env-2: rgba(1 env(--foo) 3);
-  env-3: rgba(1 2 env(--foo));
-
-  min-1: rgba(min(1) 2 3);
-  min-2: rgba(1 min(2) 3);
-  min-3: rgba(1 2 min(3));
-
-  max-1: rgba(max(1) 2 3);
-  max-2: rgba(1 max(2) 3);
-  max-3: rgba(1 2 max(3));
-
-  // var() is substituted before parsing, so it may contain multiple arguments.
-  multi-argument-var-1-of-2: rgba(var(--foo) 2);
-  multi-argument-var-2-of-2: rgba(1 var(--foo));
-  multi-argument-var-1-of-1: rgba(var(--foo));
-}
-
-alpha {
-  calc-1: rgba(calc(1) 2 3 / 0.4);
-  calc-2: rgba(1 calc(2) 3 / 0.4);
-  calc-3: rgba(1 2 calc(3) / 0.4);
-  calc-4: rgba(1 2 3 / calc(0.4));
-
-  var-1: rgba(var(--foo) 2 3 / 0.4);
-  var-2: rgba(1 var(--foo) 3 / 0.4);
-  var-3: rgba(1 2 var(--foo) / 0.4);
-  var-4: rgba(1 2 3 / var(--foo));
-
-  env-1: rgba(env(--foo) 2 3 / 0.4);
-  env-2: rgba(1 env(--foo) 3 / 0.4);
-  env-3: rgba(1 2 env(--foo) / 0.4);
-  env-4: rgba(1 2 3 / env(--foo));
-
-  min-1: rgba(min(1) 2 3 / 0.4);
-  min-2: rgba(1 min(2) 3 / 0.4);
-  min-3: rgba(1 2 min(3) / 0.4);
-  min-4: rgba(1 2 3 / min(0.4));
-
-  max-1: rgba(max(1) 2 3 / 0.4);
-  max-2: rgba(1 max(2) 3 / 0.4);
-  max-3: rgba(1 2 max(3) / 0.4);
-  max-4: rgba(1 2 3 / max(0.4));
-
-  // var() is substituted before parsing, so it may contain multiple arguments.
-  multi-argument-var-1-of-2: rgba(var(--foo) 2 / 0.4);
-  multi-argument-var-2-of-2: rgba(1 var(--foo) / 0.4);
-  multi-argument-var-1-of-1: rgba(var(--foo) / 0.4);
-}
-
-<===> output.css
-no-alpha {
-  calc-1: rgba(calc(1), 2, 3);
-  calc-2: rgba(1, calc(2), 3);
-  calc-3: rgba(1, 2, calc(3));
-  var-1: rgba(var(--foo), 2, 3);
-  var-2: rgba(1, var(--foo), 3);
-  var-3: rgba(1, 2, var(--foo));
-  env-1: rgba(env(--foo), 2, 3);
-  env-2: rgba(1, env(--foo), 3);
-  env-3: rgba(1, 2, env(--foo));
-  min-1: rgba(min(1), 2, 3);
-  min-2: rgba(1, min(2), 3);
-  min-3: rgba(1, 2, min(3));
-  max-1: rgba(max(1), 2, 3);
-  max-2: rgba(1, max(2), 3);
-  max-3: rgba(1, 2, max(3));
-  multi-argument-var-1-of-2: rgba(var(--foo) 2);
-  multi-argument-var-2-of-2: rgba(1 var(--foo));
-  multi-argument-var-1-of-1: rgba(var(--foo));
-}
-
-alpha {
-  calc-1: rgba(calc(1), 2, 3, 0.4);
-  calc-2: rgba(1, calc(2), 3, 0.4);
-  calc-3: rgba(1 2 calc(3)/0.4);
-  calc-4: rgba(1 2 3/calc(0.4));
-  var-1: rgba(var(--foo), 2, 3, 0.4);
-  var-2: rgba(1, var(--foo), 3, 0.4);
-  var-3: rgba(1 2 var(--foo)/0.4);
-  var-4: rgba(1 2 3/var(--foo));
-  env-1: rgba(env(--foo), 2, 3, 0.4);
-  env-2: rgba(1, env(--foo), 3, 0.4);
-  env-3: rgba(1 2 env(--foo)/0.4);
-  env-4: rgba(1 2 3/env(--foo));
-  min-1: rgba(min(1), 2, 3, 0.4);
-  min-2: rgba(1, min(2), 3, 0.4);
-  min-3: rgba(1 2 min(3)/0.4);
-  min-4: rgba(1 2 3/min(0.4));
-  max-1: rgba(max(1), 2, 3, 0.4);
-  max-2: rgba(1, max(2), 3, 0.4);
-  max-3: rgba(1 2 max(3)/0.4);
-  max-4: rgba(1 2 3/max(0.4));
-  multi-argument-var-1-of-2: rgba(var(--foo) 2/0.4);
-  multi-argument-var-2-of-2: rgba(1 var(--foo)/0.4);
-  multi-argument-var-1-of-1: rgba(var(--foo)/0.4);
+- sass/libsass#2726
+
+<===>
+================================================================================
+<===> no_alpha/calc/arg_1/input.scss
+a {b: rgba(calc(1) 2 3)}
+
+<===> no_alpha/calc/arg_1/output.css
+a {
+  b: rgba(calc(1), 2, 3);
+}
+
+<===>
+================================================================================
+<===> no_alpha/calc/arg_2/input.scss
+a {b: rgba(1 calc(2) 3)}
+
+<===> no_alpha/calc/arg_2/output.css
+a {
+  b: rgba(1, calc(2), 3);
+}
+
+<===>
+================================================================================
+<===> no_alpha/calc/arg_3/input.scss
+a {b: rgba(1 2 calc(3))}
+
+<===> no_alpha/calc/arg_3/output.css
+a {
+  b: rgba(1, 2, calc(3));
+}
+
+<===>
+================================================================================
+<===> no_alpha/var/arg_1/input.scss
+a {b: rgba(var(--foo) 2 3)}
+
+<===> no_alpha/var/arg_1/output.css
+a {
+  b: rgba(var(--foo), 2, 3);
+}
+
+<===>
+================================================================================
+<===> no_alpha/var/arg_2/input.scss
+a {b: rgba(1 var(--foo) 3)}
+
+<===> no_alpha/var/arg_2/output.css
+a {
+  b: rgba(1, var(--foo), 3);
+}
+
+<===>
+================================================================================
+<===> no_alpha/var/arg_3/input.scss
+a {b: rgba(1 2 var(--foo))}
+
+<===> no_alpha/var/arg_3/output.css
+a {
+  b: rgba(1, 2, var(--foo));
+}
+
+<===>
+================================================================================
+<===> no_alpha/env/arg_1/input.scss
+a {b: rgba(env(--foo) 2 3)}
+
+<===> no_alpha/env/arg_1/output.css
+a {
+  b: rgba(env(--foo), 2, 3);
+}
+
+<===>
+================================================================================
+<===> no_alpha/env/arg_2/input.scss
+a {b: rgba(1 env(--foo) 3)}
+
+<===> no_alpha/env/arg_2/output.css
+a {
+  b: rgba(1, env(--foo), 3);
+}
+
+<===>
+================================================================================
+<===> no_alpha/env/arg_3/input.scss
+a {b: rgba(1 2 env(--foo))}
+
+<===> no_alpha/env/arg_3/output.css
+a {
+  b: rgba(1, 2, env(--foo));
+}
+
+<===>
+================================================================================
+<===> no_alpha/min/arg_1/input.scss
+a {b: rgba(min(1) 2 3)}
+
+<===> no_alpha/min/arg_1/output.css
+a {
+  b: rgba(min(1), 2, 3);
+}
+
+<===>
+================================================================================
+<===> no_alpha/min/arg_2/input.scss
+a {b: rgba(1 min(2) 3)}
+
+<===> no_alpha/min/arg_2/output.css
+a {
+  b: rgba(1, min(2), 3);
+}
+
+<===>
+================================================================================
+<===> no_alpha/min/arg_3/input.scss
+a {b: rgba(1 2 min(3))}
+
+<===> no_alpha/min/arg_3/output.css
+a {
+  b: rgba(1, 2, min(3));
+}
+
+<===>
+================================================================================
+<===> no_alpha/max/arg_1/input.scss
+a {b: rgba(max(1) 2 3)}
+
+<===> no_alpha/max/arg_1/output.css
+a {
+  b: rgba(max(1), 2, 3);
+}
+
+<===>
+================================================================================
+<===> no_alpha/max/arg_2/input.scss
+a {b: rgba(1 max(2) 3)}
+
+<===> no_alpha/max/arg_2/output.css
+a {
+  b: rgba(1, max(2), 3);
+}
+
+<===>
+================================================================================
+<===> no_alpha/max/arg_3/input.scss
+a {b: rgba(1 2 max(3))}
+
+<===> no_alpha/max/arg_3/output.css
+a {
+  b: rgba(1, 2, max(3));
+}
+
+<===>
+================================================================================
+<===> no_alpha/multi_argument_var/1_of_2/input.scss
+// var() is substituted before parsing, so it may contain multiple arguments.
+a {b: rgba(var(--foo) 2)}
+
+<===> no_alpha/multi_argument_var/1_of_2/output.css
+a {
+  b: rgba(var(--foo) 2);
+}
+
+<===>
+================================================================================
+<===> no_alpha/multi_argument_var/2_of_2/input.scss
+a {b: rgba(1 var(--foo))}
+
+<===> no_alpha/multi_argument_var/2_of_2/output.css
+a {
+  b: rgba(1 var(--foo));
+}
+
+<===>
+================================================================================
+<===> no_alpha/multi_argument_var/1_of_1/input.scss
+a {b: rgba(var(--foo))}
+
+<===> no_alpha/multi_argument_var/1_of_1/output.css
+a {
+  b: rgba(var(--foo));
+}
+
+<===>
+================================================================================
+<===> alpha/calc/arg_1/input.scss
+a {b: rgba(calc(1) 2 3 / 0.4)}
+
+<===> alpha/calc/arg_1/output.css
+a {
+  b: rgba(calc(1), 2, 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/calc/arg_2/input.scss
+a {b: rgba(1 calc(2) 3 / 0.4)}
+
+<===> alpha/calc/arg_2/output.css
+a {
+  b: rgba(1, calc(2), 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/calc/arg_3/input.scss
+a {b: rgba(1 2 calc(3) / 0.4)}
+
+<===> alpha/calc/arg_3/output.css
+a {
+  b: rgba(1 2 calc(3)/0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/calc/arg_4/input.scss
+a {b: rgba(1 2 3 / calc(0.4))}
+
+<===> alpha/calc/arg_4/output.css
+a {
+  b: rgba(1 2 3/calc(0.4));
+}
+
+<===>
+================================================================================
+<===> alpha/var/arg_1/input.scss
+a {b: rgba(var(--foo) 2 3 / 0.4)}
+
+<===> alpha/var/arg_1/output.css
+a {
+  b: rgba(var(--foo), 2, 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/var/arg_2/input.scss
+a {b: rgba(1 var(--foo) 3 / 0.4)}
+
+<===> alpha/var/arg_2/output.css
+a {
+  b: rgba(1, var(--foo), 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/var/arg_3/input.scss
+a {b: rgba(1 2 var(--foo) / 0.4)}
+
+<===> alpha/var/arg_3/output.css
+a {
+  b: rgba(1 2 var(--foo)/0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/var/arg_4/input.scss
+a {b: rgba(1 2 3 / var(--foo))}
+
+<===> alpha/var/arg_4/output.css
+a {
+  b: rgba(1 2 3/var(--foo));
+}
+
+<===>
+================================================================================
+<===> alpha/env/arg_1/input.scss
+a {b: rgba(env(--foo) 2 3 / 0.4)}
+
+<===> alpha/env/arg_1/output.css
+a {
+  b: rgba(env(--foo), 2, 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/env/arg_2/input.scss
+a {b: rgba(1 env(--foo) 3 / 0.4)}
+
+<===> alpha/env/arg_2/output.css
+a {
+  b: rgba(1, env(--foo), 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/env/arg_3/input.scss
+a {b: rgba(1 2 env(--foo) / 0.4)}
+
+<===> alpha/env/arg_3/output.css
+a {
+  b: rgba(1 2 env(--foo)/0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/env/arg_4/input.scss
+a {b: rgba(1 2 3 / env(--foo))}
+
+<===> alpha/env/arg_4/output.css
+a {
+  b: rgba(1 2 3/env(--foo));
+}
+
+<===>
+================================================================================
+<===> alpha/min/arg_1/input.scss
+a {b: rgba(min(1) 2 3 / 0.4)}
+
+<===> alpha/min/arg_1/output.css
+a {
+  b: rgba(min(1), 2, 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/min/arg_2/input.scss
+a {b: rgba(1 min(2) 3 / 0.4)}
+
+<===> alpha/min/arg_2/output.css
+a {
+  b: rgba(1, min(2), 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/min/arg_3/input.scss
+a {b: rgba(1 2 min(3) / 0.4)}
+
+<===> alpha/min/arg_3/output.css
+a {
+  b: rgba(1 2 min(3)/0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/min/arg_4/input.scss
+a {b: rgba(1 2 3 / min(0.4))}
+
+<===> alpha/min/arg_4/output.css
+a {
+  b: rgba(1 2 3/min(0.4));
+}
+
+<===>
+================================================================================
+<===> alpha/max/arg_1/input.scss
+a {b: rgba(max(1) 2 3 / 0.4)}
+
+<===> alpha/max/arg_1/output.css
+a {
+  b: rgba(max(1), 2, 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/max/arg_2/input.scss
+a {b: rgba(1 max(2) 3 / 0.4)}
+
+<===> alpha/max/arg_2/output.css
+a {
+  b: rgba(1, max(2), 3, 0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/max/arg_3/input.scss
+a {b: rgba(1 2 max(3) / 0.4)}
+
+<===> alpha/max/arg_3/output.css
+a {
+  b: rgba(1 2 max(3)/0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/max/arg_4/input.scss
+a {b: rgba(1 2 3 / max(0.4))}
+
+<===> alpha/max/arg_4/output.css
+a {
+  b: rgba(1 2 3/max(0.4));
+}
+
+<===>
+================================================================================
+<===> alpha/multi_argument_var/1_of_2/input.scss
+// var() is substituted before parsing, so it may contain multiple arguments.
+a {b: rgba(var(--foo) 2 / 0.4)}
+
+<===> alpha/multi_argument_var/1_of_2/output.css
+a {
+  b: rgba(var(--foo) 2/0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/multi_argument_var/2_of_2/input.scss
+a {b: rgba(1 var(--foo) / 0.4)}
+
+<===> alpha/multi_argument_var/2_of_2/output.css
+a {
+  b: rgba(1 var(--foo)/0.4);
+}
+
+<===>
+================================================================================
+<===> alpha/multi_argument_var/1_of_1/input.scss
+a {b: rgba(var(--foo) / 0.4)}
+
+<===> alpha/multi_argument_var/1_of_1/output.css
+a {
+  b: rgba(var(--foo)/0.4);
 }
diff --git a/spec/core_functions/color/rgba/three_args/basic.hrx b/spec/core_functions/color/rgba/three_args/basic.hrx
deleted file mode 100644
index a54b9670f1..0000000000
--- a/spec/core_functions/color/rgba/three_args/basic.hrx
+++ /dev/null
@@ -1,56 +0,0 @@
-<===> input.scss
-// Channels may be specified as unitless numbers between 0 and 255.
-unitless {
-  numbers: rgba(18, 52, 86);
-  beaded: rgba(190, 173, 237);
-  springgreen: rgba(0, 255, 127);
-  named: rgba($red: 0, $green: 255, $blue: 127);
-
-  // Channels that are out of bounds are clamped within bounds.
-  clamped {
-    red: rgba(256, 0, 0);
-    green: rgba(0, -1, 0);
-    blue: rgba(0, 0, 9999);
-  }
-}
-
-// Channels may also be specified as percents between 0% and 100%, which may be
-// mixed with unitless numbers.
-percents {
-  all-percent: rgba(7.1%, 20.4%, 33.9%);
-  unitless-green: rgba(74.7%, 173, 93%);
-  percent-green: rgba(190, 68%, 237);
-  boundaries: rgba(0%, 100%, 50%);
-
-  // Channels that are out of bounds are clamped within bounds.
-  clamped {
-    red: rgba(100.1%, 0, 0);
-    green: rgba(0, -0.1%, 0);
-    blue: rgba(0, 0, 200%);
-  }
-}
-
-<===> output.css
-unitless {
-  numbers: #123456;
-  beaded: #beaded;
-  springgreen: springgreen;
-  named: springgreen;
-}
-unitless clamped {
-  red: red;
-  green: black;
-  blue: blue;
-}
-
-percents {
-  all-percent: #123456;
-  unitless-green: #beaded;
-  percent-green: #beaded;
-  boundaries: #00ff80;
-}
-percents clamped {
-  red: red;
-  green: black;
-  blue: blue;
-}
diff --git a/spec/core_functions/color/rgba/three_args/options.yml b/spec/core_functions/color/rgba/three_args/options.yml
index 076f9d2d59..018b0da451 100644
--- a/spec/core_functions/color/rgba/three_args/options.yml
+++ b/spec/core_functions/color/rgba/three_args/options.yml
@@ -1,3 +1,3 @@
 ---
 :todo:
-- libsass # sass/libsass#2722
+- sass/libsass#2722
diff --git a/spec/core_functions/color/rgba/three_args/percents.hrx b/spec/core_functions/color/rgba/three_args/percents.hrx
new file mode 100644
index 0000000000..8821c5144e
--- /dev/null
+++ b/spec/core_functions/color/rgba/three_args/percents.hrx
@@ -0,0 +1,81 @@
+<===>
+================================================================================
+<===> README.md
+Channels may also be specified as percents between 0% and 100%, which may be
+mixed with unitless numbers.
+
+<===>
+================================================================================
+<===> all/percent/input.scss
+a {b: rgba(7.1%, 20.4%, 33.9%)}
+
+<===> all/percent/output.css
+a {
+  b: #123456;
+}
+
+<===>
+================================================================================
+<===> unitless/green/input.scss
+a {b: rgba(74.7%, 173, 93%)}
+
+<===> unitless/green/output.css
+a {
+  b: #beaded;
+}
+
+<===>
+================================================================================
+<===> percent/green/input.scss
+a {b: rgba(190, 68%, 237)}
+
+<===> percent/green/output.css
+a {
+  b: #beaded;
+}
+
+<===>
+================================================================================
+<===> boundaries/input.scss
+a {b: rgba(0%, 100%, 50%)}
+
+<===> boundaries/output.css
+a {
+  b: #00ff80;
+}
+
+<===>
+================================================================================
+<===> clamped/README.md
+Channels that are out of bounds are clamped within bounds.
+
+<===>
+================================================================================
+<===> clamped/red/input.scss
+a {b: rgba(100.1%, 0, 0)}
+
+<===> clamped/red/output.css
+a {
+  b: red;
+}
+
+<===>
+================================================================================
+<===> clamped/green/input.scss
+a {b: rgba(0, -0.1%, 0)}
+
+<===> clamped/green/output.css
+a {
+  b: black;
+}
+
+<===>
+================================================================================
+<===> clamped/blue/input.scss
+a {b: rgba(0, 0, 200%)}
+
+<===> clamped/blue/output.css
+a {
+  b: blue;
+}
+
diff --git a/spec/core_functions/color/rgba/three_args/special_functions.hrx b/spec/core_functions/color/rgba/three_args/special_functions.hrx
index c3426fd224..d3e9399b83 100644
--- a/spec/core_functions/color/rgba/three_args/special_functions.hrx
+++ b/spec/core_functions/color/rgba/three_args/special_functions.hrx
@@ -1,46 +1,155 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2726
+- sass/libsass#2726
 
-<===> input.scss
+<===>
+================================================================================
+<===> calc/arg_1/input.scss
+a {b: rgba(calc(1), 2, 3)}
+
+<===> calc/arg_1/output.css
+a {
+  b: rgba(calc(1), 2, 3);
+}
+
+<===>
+================================================================================
+<===> calc/arg_2/input.scss
+a {b: rgba(1, calc(2), 3)}
+
+<===> calc/arg_2/output.css
+a {
+  b: rgba(1, calc(2), 3);
+}
+
+<===>
+================================================================================
+<===> calc/arg_3/input.scss
+a {b: rgba(1, 2, calc(3))}
+
+<===> calc/arg_3/output.css
+a {
+  b: rgba(1, 2, calc(3));
+}
+
+<===>
+================================================================================
+<===> var/arg_1/input.scss
+a {b: rgba(var(--foo), 2, 3)}
+
+<===> var/arg_1/output.css
 a {
-  calc-1: rgba(calc(1), 2, 3);
-  calc-2: rgba(1, calc(2), 3);
-  calc-3: rgba(1, 2, calc(3));
+  b: rgba(var(--foo), 2, 3);
+}
 
-  var-1: rgba(var(--foo), 2, 3);
-  var-2: rgba(1, var(--foo), 3);
-  var-3: rgba(1, 2, var(--foo));
+<===>
+================================================================================
+<===> var/arg_2/input.scss
+a {b: rgba(1, var(--foo), 3)}
 
-  env-1: rgba(env(--foo), 2, 3);
-  env-2: rgba(1, env(--foo), 3);
-  env-3: rgba(1, 2, env(--foo));
+<===> var/arg_2/output.css
+a {
+  b: rgba(1, var(--foo), 3);
+}
 
-  min-1: rgba(min(1), 2, 3);
-  min-2: rgba(1, min(2), 3);
-  min-3: rgba(1, 2, min(3));
+<===>
+================================================================================
+<===> var/arg_3/input.scss
+a {b: rgba(1, 2, var(--foo))}
 
-  max-1: rgba(max(1), 2, 3);
-  max-2: rgba(1, max(2), 3);
-  max-3: rgba(1, 2, max(3));
+<===> var/arg_3/output.css
+a {
+  b: rgba(1, 2, var(--foo));
 }
 
-<===> output.css
+<===>
+================================================================================
+<===> env/arg_1/input.scss
+a {b: rgba(env(--foo), 2, 3)}
+
+<===> env/arg_1/output.css
+a {
+  b: rgba(env(--foo), 2, 3);
+}
+
+<===>
+================================================================================
+<===> env/arg_2/input.scss
+a {b: rgba(1, env(--foo), 3)}
+
+<===> env/arg_2/output.css
+a {
+  b: rgba(1, env(--foo), 3);
+}
+
+<===>
+================================================================================
+<===> env/arg_3/input.scss
+a {b: rgba(1, 2, env(--foo))}
+
+<===> env/arg_3/output.css
 a {
-  calc-1: rgba(calc(1), 2, 3);
-  calc-2: rgba(1, calc(2), 3);
-  calc-3: rgba(1, 2, calc(3));
-  var-1: rgba(var(--foo), 2, 3);
-  var-2: rgba(1, var(--foo), 3);
-  var-3: rgba(1, 2, var(--foo));
-  env-1: rgba(env(--foo), 2, 3);
-  env-2: rgba(1, env(--foo), 3);
-  env-3: rgba(1, 2, env(--foo));
-  min-1: rgba(min(1), 2, 3);
-  min-2: rgba(1, min(2), 3);
-  min-3: rgba(1, 2, min(3));
-  max-1: rgba(max(1), 2, 3);
-  max-2: rgba(1, max(2), 3);
-  max-3: rgba(1, 2, max(3));
+  b: rgba(1, 2, env(--foo));
 }
+
+<===>
+================================================================================
+<===> min/arg_1/input.scss
+a {b: rgba(min(1), 2, 3)}
+
+<===> min/arg_1/output.css
+a {
+  b: rgba(min(1), 2, 3);
+}
+
+<===>
+================================================================================
+<===> min/arg_2/input.scss
+a {b: rgba(1, min(2), 3)}
+
+<===> min/arg_2/output.css
+a {
+  b: rgba(1, min(2), 3);
+}
+
+<===>
+================================================================================
+<===> min/arg_3/input.scss
+a {b: rgba(1, 2, min(3))}
+
+<===> min/arg_3/output.css
+a {
+  b: rgba(1, 2, min(3));
+}
+
+<===>
+================================================================================
+<===> max/arg_1/input.scss
+a {b: rgba(max(1), 2, 3)}
+
+<===> max/arg_1/output.css
+a {
+  b: rgba(max(1), 2, 3);
+}
+
+<===>
+================================================================================
+<===> max/arg_2/input.scss
+a {b: rgba(1, max(2), 3)}
+
+<===> max/arg_2/output.css
+a {
+  b: rgba(1, max(2), 3);
+}
+
+<===>
+================================================================================
+<===> max/arg_3/input.scss
+a {b: rgba(1, 2, max(3))}
+
+<===> max/arg_3/output.css
+a {
+  b: rgba(1, 2, max(3));
+}
+
diff --git a/spec/core_functions/color/rgba/three_args/unitless.hrx b/spec/core_functions/color/rgba/three_args/unitless.hrx
new file mode 100644
index 0000000000..247c2e7651
--- /dev/null
+++ b/spec/core_functions/color/rgba/three_args/unitless.hrx
@@ -0,0 +1,77 @@
+<===> README.md
+Channels may be specified as unitless numbers between 0 and 255.
+
+<===>
+================================================================================
+<===> numbers/input.scss
+a {b: rgba(18, 52, 86)}
+
+<===> numbers/output.css
+a {
+  b: #123456;
+}
+
+<===>
+================================================================================
+<===> beaded/input.scss
+a {b: rgba(190, 173, 237)}
+
+<===> beaded/output.css
+a {
+  b: #beaded;
+}
+
+<===>
+================================================================================
+<===> springgreen/input.scss
+a {b: rgba(0, 255, 127)}
+
+<===> springgreen/output.css
+a {
+  b: springgreen;
+}
+
+<===>
+================================================================================
+<===> named/input.scss
+a {b: rgba($red: 0, $green: 255, $blue: 127)}
+
+<===> named/output.css
+a {
+  b: springgreen;
+}
+
+<===>
+================================================================================
+<===> clamped/README.md
+Channels that are out of bounds are clamped within bounds.
+
+<===>
+================================================================================
+<===> clamped/red/input.scss
+a {b: rgba(256, 0, 0)}
+
+<===> clamped/red/output.css
+a {
+  b: red;
+}
+
+<===>
+================================================================================
+<===> clamped/green/input.scss
+a {b: rgba(0, -1, 0)}
+
+<===> clamped/green/output.css
+a {
+  b: black;
+}
+
+<===>
+================================================================================
+<===> clamped/blue/input.scss
+a {b: rgba(0, 0, 9999)}
+
+<===> clamped/blue/output.css
+a {
+  b: blue;
+}
diff --git a/spec/core_functions/color/rgba/two_args.hrx b/spec/core_functions/color/rgba/two_args.hrx
index 40f7e051ab..98900fe9de 100644
--- a/spec/core_functions/color/rgba/two_args.hrx
+++ b/spec/core_functions/color/rgba/two_args.hrx
@@ -1,56 +1,118 @@
-<===> input.scss
-opaque-to {
-  opaque: rgba(#123, 1);
-  partial: rgba(#123, 0.5);
-  transparent: rgba(#123, 0);
+<===> opaque_to/opaque/input.scss
+a {b: rgba(#123, 1)}
+
+<===> opaque_to/opaque/output.css
+a {
+  b: #112233;
 }
 
-partial-to {
-  $color: rgba(0, 0, 255, 0.3);
-  opaque: rgba($color, 1);
-  partial: rgba($color, 0.5);
-  transparent: rgba($color, 0);
+<===>
+================================================================================
+<===> opaque_to/partial/input.scss
+a {b: rgba(#123, 0.5)}
+
+<===> opaque_to/partial/output.css
+a {
+  b: rgba(17, 34, 51, 0.5);
 }
 
-transparent-to {
-  opaque: rgba(transparent, 1);
-  partial: rgba(transparent, 0.5);
-  transparent: rgba(transparent, 0);
+<===>
+================================================================================
+<===> opaque_to/transparent/input.scss
+a {b: rgba(#123, 0)}
+
+<===> opaque_to/transparent/output.css
+a {
+  b: rgba(17, 34, 51, 0);
 }
 
-clamped {
-  opaque: rgba(#123, 1.1);
-  transparent: rgba(#123, -0.1);
+<===>
+================================================================================
+<===> partial_to/opaque/input.scss
+a {b: rgba(rgba(0, 0, 255, 0.3), 1)}
+
+<===> partial_to/opaque/output.css
+a {
+  b: blue;
 }
 
-named {
-  x: rgba($color: #123, $alpha: 0.5);
+<===>
+================================================================================
+<===> partial_to/partial/input.scss
+a {b: rgba(rgba(0, 0, 255, 0.3), 0.5)}
+
+<===> partial_to/partial/output.css
+a {
+  b: rgba(0, 0, 255, 0.5);
 }
 
-<===> output.css
-opaque-to {
-  opaque: #112233;
-  partial: rgba(17, 34, 51, 0.5);
-  transparent: rgba(17, 34, 51, 0);
+<===>
+================================================================================
+<===> partial_to/transparent/input.scss
+a {b: rgba(rgba(0, 0, 255, 0.3), 0)}
+
+<===> partial_to/transparent/output.css
+a {
+  b: rgba(0, 0, 255, 0);
 }
 
-partial-to {
-  opaque: blue;
-  partial: rgba(0, 0, 255, 0.5);
-  transparent: rgba(0, 0, 255, 0);
+<===>
+================================================================================
+<===> transparent_to/opaque/input.scss
+a {b: rgba(transparent, 1)}
+
+<===> transparent_to/opaque/output.css
+a {
+  b: black;
 }
 
-transparent-to {
-  opaque: black;
-  partial: rgba(0, 0, 0, 0.5);
-  transparent: rgba(0, 0, 0, 0);
+<===>
+================================================================================
+<===> transparent_to/partial/input.scss
+a {b: rgba(transparent, 0.5)}
+
+<===> transparent_to/partial/output.css
+a {
+  b: rgba(0, 0, 0, 0.5);
 }
 
-clamped {
-  opaque: #112233;
-  transparent: rgba(17, 34, 51, 0);
+<===>
+================================================================================
+<===> transparent_to/transparent/input.scss
+a {b: rgba(transparent, 0)}
+
+<===> transparent_to/transparent/output.css
+a {
+  b: rgba(0, 0, 0, 0);
 }
 
-named {
-  x: rgba(17, 34, 51, 0.5);
+<===>
+================================================================================
+<===> clamped/opaque/input.scss
+a {b: rgba(#123, 1.1)}
+
+<===> clamped/opaque/output.css
+a {
+  b: #112233;
+}
+
+<===>
+================================================================================
+<===> clamped/transparent/input.scss
+a {b: rgba(#123, -0.1)}
+
+<===> clamped/transparent/output.css
+a {
+  b: rgba(17, 34, 51, 0);
 }
+
+<===>
+================================================================================
+<===> named/input.scss
+a {b: rgba($color: #123, $alpha: 0.5)}
+
+<===> named/output.css
+a {
+  b: rgba(17, 34, 51, 0.5);
+}
+
diff --git a/spec/core_functions/color/saturate.hrx b/spec/core_functions/color/saturate.hrx
new file mode 100644
index 0000000000..c6808ba970
--- /dev/null
+++ b/spec/core_functions/color/saturate.hrx
@@ -0,0 +1,239 @@
+<===> one_arg/README.md
+Sass supports saturate() with one argument for compatibility with [plain CSS][].
+
+[plain CSS]: https://developer.mozilla.org/en-US/docs/Web/CSS/filter-function/saturate
+
+<===>
+================================================================================
+<===> one_arg/unit/input.scss
+a {b: saturate(50%)}
+
+<===> one_arg/unit/output.css
+a {
+  b: saturate(50%);
+}
+
+<===>
+================================================================================
+<===> one_arg/unitless/input.scss
+a {b: saturate(1)}
+
+<===> one_arg/unitless/output.css
+a {
+  b: saturate(1);
+}
+
+<===>
+================================================================================
+<===> one_arg/named/options.yml
+---
+:todo:
+- sass/libsass#2897
+- sass/dart-sass#699
+
+<===> one_arg/named/input.scss
+a {b: saturate($amount: 50%)}
+
+<===> one_arg/named/output.css
+a {
+  b: saturate(50%);
+}
+
+<===>
+================================================================================
+<===> two_args/max/input.scss
+a {b: saturate(plum, 100%)}
+
+<===> two_args/max/output.css
+a {
+  b: #ff7eff;
+}
+
+<===>
+================================================================================
+<===> two_args/max_remaining/input.scss
+a {b: saturate(plum, 53%)}
+
+<===> two_args/max_remaining/output.css
+a {
+  b: #ff7eff;
+}
+
+<===>
+================================================================================
+<===> two_args/min/input.scss
+a {b: saturate(plum, 0%)}
+
+<===> two_args/min/output.css
+a {
+  b: plum;
+}
+
+<===>
+================================================================================
+<===> two_args/middle/input.scss
+a {b: saturate(plum, 14%)}
+
+<===> two_args/middle/output.css
+a {
+  b: #e697e6;
+}
+
+<===>
+================================================================================
+<===> two_args/alpha/input.scss
+a {b: saturate(rgba(plum, 0.5), 100%)}
+
+<===> two_args/alpha/output.css
+a {
+  b: rgba(255, 126, 255, 0.5);
+}
+
+<===>
+================================================================================
+<===> two_args/named/input.scss
+a {b: saturate($color: plum, $amount: 14%)}
+
+<===> two_args/named/output.css
+a {
+  b: #e697e6;
+}
+
+<===>
+================================================================================
+<===> error/too_few_args/input.scss
+a {b: saturate()}
+
+<===> error/too_few_args/error
+Error: Missing argument $color.
+  ,
+1 | a {b: saturate()}
+  |       ^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_few_args/error-libsass
+Error: Function saturate is missing argument $color.
+        on line 1 of input.scss
+>> a {b: saturate()}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/too_many_args/input.scss
+a {b: saturate(plum, 1%, 2)}
+
+<===> error/too_many_args/error
+Error: Only 2 arguments allowed, but 3 were passed.
+  ,
+1 | a {b: saturate(plum, 1%, 2)}
+  |       ^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_many_args/error-libsass
+Error: wrong number of arguments (3 for 2) for `saturate'
+        on line 1:7 of input.scss
+>> a {b: saturate(plum, 1%, 2)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/one_arg/type/input.scss
+a {b: saturate(red)}
+
+<===> error/one_arg/type/error
+Error: $number: red is not a number.
+  ,
+1 | a {b: saturate(red)}
+  |       ^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/one_arg/type/options.yml
+---
+:todo:
+- sass/libsass#2895
+
+<===>
+================================================================================
+<===> error/two_args/type/color/input.scss
+a {b: saturate(1, 2)}
+
+<===> error/two_args/type/color/error
+Error: $color: 1 is not a color.
+  ,
+1 | a {b: saturate(1, 2)}
+  |       ^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/two_args/type/color/error-libsass
+Error: argument `$color` of `saturate($color, $amount: false)` must be a color
+        on line 1:7 of input.scss, in function `saturate`
+        from line 1:7 of input.scss
+>> a {b: saturate(1, 2)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/two_args/type/lightness/input.scss
+a {b: saturate(plum, blue)}
+
+<===> error/two_args/type/lightness/error
+Error: $amount: blue is not a number.
+  ,
+1 | a {b: saturate(plum, blue)}
+  |       ^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/two_args/type/lightness/options.yml
+---
+:todo:
+- sass/libsass#2896
+
+<===>
+================================================================================
+<===> error/two_args/bounds/too_low/input.scss
+a {b: saturate(plum, -0.001)}
+
+<===> error/two_args/bounds/too_low/error
+Error: Expected -0.001 to be within 0 and 100.
+  ,
+1 | a {b: saturate(plum, -0.001)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/two_args/bounds/too_low/error-libsass
+Error: argument `$amount` of `saturate($color, $amount: false)` must be between -0 and 100
+        on line 1:7 of input.scss, in function `saturate`
+        from line 1:7 of input.scss
+>> a {b: saturate(plum, -0.001)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/two_args/bounds/too_high/input.scss
+a {b: saturate(plum, 100.001)}
+
+<===> error/two_args/bounds/too_high/error
+Error: Expected 100.001 to be within 0 and 100.
+  ,
+1 | a {b: saturate(plum, 100.001)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/two_args/bounds/too_high/error-libsass
+Error: argument `$amount` of `saturate($color, $amount: false)` must be between -0 and 100
+        on line 1:7 of input.scss, in function `saturate`
+        from line 1:7 of input.scss
+>> a {b: saturate(plum, 100.001)}
+
+   ------^
diff --git a/spec/core_functions/color/saturation.hrx b/spec/core_functions/color/saturation.hrx
new file mode 100644
index 0000000000..c9d0cf9da7
--- /dev/null
+++ b/spec/core_functions/color/saturation.hrx
@@ -0,0 +1,108 @@
+<===> max/input.scss
+a {b: saturation(hsl(0, 100%, 100%))}
+
+<===> max/output.css
+a {
+  b: 100%;
+}
+
+<===>
+================================================================================
+<===> min/input.scss
+a {b: saturation(hsl(0, 0%, 100%))}
+
+<===> min/output.css
+a {
+  b: 0%;
+}
+
+<===>
+================================================================================
+<===> middle/input.scss
+a {b: saturation(hsl(0, 50%, 100%))}
+
+<===> middle/output.css
+a {
+  b: 50%;
+}
+
+<===>
+================================================================================
+<===> fraction/input.scss
+a {b: saturation(hsl(0, 0.5%, 100%))}
+
+<===> fraction/output.css
+a {
+  b: 0.5%;
+}
+
+<===>
+================================================================================
+<===> named/input.scss
+a {b: saturation($color: hsl(0, 42%, 100%))}
+
+<===> named/output.css
+a {
+  b: 42%;
+}
+
+<===>
+================================================================================
+<===> error/too_few_args/input.scss
+a {b: saturation()}
+
+<===> error/too_few_args/error
+Error: Missing argument $color.
+  ,
+1 | a {b: saturation()}
+  |       ^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_few_args/error-libsass
+Error: Function saturation is missing argument $color.
+        on line 1 of input.scss
+>> a {b: saturation()}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/too_many_args/input.scss
+a {b: saturation(red, green)}
+
+<===> error/too_many_args/error
+Error: Only 1 argument allowed, but 2 were passed.
+  ,
+1 | a {b: saturation(red, green)}
+  |       ^^^^^^^^^^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/too_many_args/error-libsass
+Error: wrong number of arguments (2 for 1) for `saturation'
+        on line 1:7 of input.scss
+>> a {b: saturation(red, green)}
+
+   ------^
+
+<===>
+================================================================================
+<===> error/type/input.scss
+a {b: saturation(1)}
+
+<===> error/type/error
+Error: $color: 1 is not a color.
+  ,
+1 | a {b: saturation(1)}
+  |       ^^^^^^^^^^^^^
+  '
+  input.scss 1:7  root stylesheet
+
+<===> error/type/error-libsass
+Error: argument `$color` of `saturation($color)` must be a color
+        on line 1:7 of input.scss, in function `saturation`
+        from line 1:7 of input.scss
+>> a {b: saturation(1)}
+
+   ------^
diff --git a/spec/core_functions/function_exists.hrx b/spec/core_functions/function_exists.hrx
index 1509c33441..0712ff663d 100644
--- a/spec/core_functions/function_exists.hrx
+++ b/spec/core_functions/function_exists.hrx
@@ -52,7 +52,7 @@ a {
 <===> through_use/options.yml
 ---
 :todo:
-- libsass # sass/libsass#2807
+- sass/libsass#2807
 
 <===> through_use/input.scss
 @use "other" as *;
@@ -71,7 +71,7 @@ a {
 <===> through_forward/options.yml
 ---
 :todo:
-- libsass # sass/libsass#2807
+- sass/libsass#2807
 
 <===>
 ================================================================================
@@ -243,7 +243,7 @@ Error: wrong number of arguments (2 for 1) for `function-exists'
 <===> conflict/options.yml
 ---
 :todo:
-- libsass # sass/libsass#2807
+- sass/libsass#2807
 
 <===> conflict/input.scss
 @use "other1" as *;
diff --git a/spec/core_functions/get_function.hrx b/spec/core_functions/get_function.hrx
index 8dcab5953b..1a0675d242 100644
--- a/spec/core_functions/get_function.hrx
+++ b/spec/core_functions/get_function.hrx
@@ -58,7 +58,7 @@ a {
 <===> through_use/options.yml
 ---
 :todo:
-- libsass # sass/libsass#2807
+- sass/libsass#2807
 
 <===> through_use/input.scss
 @use "other" as *;
@@ -77,7 +77,7 @@ a {
 <===> through_forward/options.yml
 ---
 :todo:
-- libsass # sass/libsass#2807
+- sass/libsass#2807
 
 <===>
 ================================================================================
@@ -175,7 +175,7 @@ a {
 <===> scope/stores_local_scope/options.yml
 ---
 :todo:
-- libsass # sass/libsass#2830
+- sass/libsass#2830
 
 <===> scope/stores_local_scope/input.scss
 $add-two-fn: null;
@@ -499,7 +499,7 @@ Error: $name: get-function("add-two") is not a string.
 <===> conflict/options.yml
 ---
 :todo:
-- libsass # sass/libsass#2807
+- sass/libsass#2807
 
 <===> conflict/input.scss
 @use "other1" as *;
diff --git a/spec/core_functions/global_variable_exists.hrx b/spec/core_functions/global_variable_exists.hrx
index ca719f620e..08792f2052 100644
--- a/spec/core_functions/global_variable_exists.hrx
+++ b/spec/core_functions/global_variable_exists.hrx
@@ -40,7 +40,7 @@ a {
 <===> through_use/options.yml
 ---
 :todo:
-- libsass # sass/libsass#2807
+- sass/libsass#2807
 
 <===> through_use/input.scss
 @use "other" as *;
@@ -59,7 +59,7 @@ a {
 <===> through_forward/options.yml
 ---
 :todo:
-- libsass # sass/libsass#2807
+- sass/libsass#2807
 
 <===>
 ================================================================================
@@ -243,7 +243,7 @@ Error: wrong number of arguments (2 for 1) for `global-variable-exists'
 <===> conflict/options.yml
 ---
 :todo:
-- libsass # sass/libsass#2807
+- sass/libsass#2807
 
 <===> conflict/input.scss
 @use "other1" as *;
diff --git a/spec/core_functions/inspect.hrx b/spec/core_functions/inspect.hrx
index b3d14a9764..538c4212e8 100644
--- a/spec/core_functions/inspect.hrx
+++ b/spec/core_functions/inspect.hrx
@@ -369,7 +369,7 @@ a {
 <===> list/nested/options.yml
 ---
 :todo:
-- libsass # sass/libsass#2654
+- sass/libsass#2654
 
 <===> list/nested/input.scss
 a {
diff --git a/spec/core_functions/invert/weight-parameter.hrx b/spec/core_functions/invert/weight-parameter.hrx
deleted file mode 100644
index 0ac9834021..0000000000
--- a/spec/core_functions/invert/weight-parameter.hrx
+++ /dev/null
@@ -1,15 +0,0 @@
-<===> input.scss
-.invert-with-weight {
-  zero-percent: invert(#edc, 0%);
-  ten-percent: invert(#edc, 10%);
-  keyword: invert(#edc, $weight: 10%);
-  one-hundred-percent: invert(#edc, 100%);
-}
-
-<===> output.css
-.invert-with-weight {
-  zero-percent: #eeddcc;
-  ten-percent: #d8cabd;
-  keyword: #d8cabd;
-  one-hundred-percent: #112233;
-}
diff --git a/spec/core_functions/mixin_exists.hrx b/spec/core_functions/mixin_exists.hrx
index 6b2c1f520a..6b9a57b2f3 100644
--- a/spec/core_functions/mixin_exists.hrx
+++ b/spec/core_functions/mixin_exists.hrx
@@ -52,7 +52,7 @@ a {
 <===> through_use/options.yml
 ---
 :todo:
-- libsass # sass/libsass#2807
+- sass/libsass#2807
 
 <===> through_use/input.scss
 @use "other" as *;
@@ -71,7 +71,7 @@ a {
 <===> through_forward/options.yml
 ---
 :todo:
-- libsass # sass/libsass#2807
+- sass/libsass#2807
 
 <===>
 ================================================================================
@@ -243,7 +243,7 @@ Error: wrong number of arguments (2 for 1) for `mixin-exists'
 <===> conflict/options.yml
 ---
 :todo:
-- libsass # sass/libsass#2807
+- sass/libsass#2807
 
 <===> conflict/input.scss
 @use "other1" as *;
diff --git a/spec/core_functions/variable_exists.hrx b/spec/core_functions/variable_exists.hrx
index 97c3be1149..53765d99e7 100644
--- a/spec/core_functions/variable_exists.hrx
+++ b/spec/core_functions/variable_exists.hrx
@@ -40,7 +40,7 @@ a {
 <===> through_use/options.yml
 ---
 :todo:
-- libsass # sass/libsass#2807
+- sass/libsass#2807
 
 <===> through_use/input.scss
 @use "other" as *;
@@ -59,7 +59,7 @@ a {
 <===> through_forward/options.yml
 ---
 :todo:
-- libsass # sass/libsass#2807
+- sass/libsass#2807
 
 <===>
 ================================================================================
@@ -226,7 +226,7 @@ Error: wrong number of arguments (2 for 1) for `variable-exists'
 <===> conflict/options.yml
 ---
 :todo:
-- libsass # sass/libsass#2807
+- sass/libsass#2807
 
 <===> conflict/input.scss
 @use "other1" as *;
diff --git a/spec/css/selector.hrx b/spec/css/selector.hrx
index def4ac8299..69bfbbdc1a 100644
--- a/spec/css/selector.hrx
+++ b/spec/css/selector.hrx
@@ -17,7 +17,7 @@
 <===> attribute/modifier/unknown/options.yml
 ---
 :todo:
-- libsass # sass/libsass#2886
+- sass/libsass#2886
 
 <===> attribute/modifier/unknown/input.scss
 // At time of writing, only the modifiers "i" and "s" are allowed by the CSS
diff --git a/spec/css/url.hrx b/spec/css/url.hrx
index bf82d18b61..efc3670e9b 100644
--- a/spec/css/url.hrx
+++ b/spec/css/url.hrx
@@ -1,7 +1,7 @@
 <===> exclam/options.yml
 ---
 :todo:
-- libsass # sass/libsass#2880
+- sass/libsass#2880
 
 <===>
 ================================================================================
diff --git a/spec/directives/function/escaped.hrx b/spec/directives/function/escaped.hrx
index cf99b0df6c..77655b0d92 100644
--- a/spec/directives/function/escaped.hrx
+++ b/spec/directives/function/escaped.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
 
 <===> input.scss
 // Function names can be defined and referred to using escapes, which are
diff --git a/spec/directives/if/escaped.hrx b/spec/directives/if/escaped.hrx
index eacfdedf32..99daf517f3 100644
--- a/spec/directives/if/escaped.hrx
+++ b/spec/directives/if/escaped.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
 
 <===> input.scss
 // Escapes should be normalized before directives are parsed.
diff --git a/spec/directives/import/load.hrx b/spec/directives/import/load.hrx
index 81d5cd6a8f..6ecc8fc967 100644
--- a/spec/directives/import/load.hrx
+++ b/spec/directives/import/load.hrx
@@ -41,7 +41,7 @@ a {
 <===> precedence/scss_before_css/options.yml
 ---
 :todo:
-- libsass # sass/libsass#2699
+- sass/libsass#2699
 
 <===> precedence/scss_before_css/input.scss
 @import "other";
@@ -62,7 +62,7 @@ a {
 <===> precedence/sass_before_css/options.yml
 ---
 :todo:
-- libsass # sass/libsass#2699
+- sass/libsass#2699
 
 <===> precedence/sass_before_css/input.scss
 @import "other";
@@ -98,7 +98,7 @@ a {
 <===> precedence/import_only/options.yml
 ---
 :todo:
-- libsass # sass/libsass#2807
+- sass/libsass#2807
 
 <===>
 ================================================================================
diff --git a/spec/errors/extend/placeholder/missing.hrx b/spec/errors/extend/placeholder/missing.hrx
index d123403bdb..4fcab57171 100644
--- a/spec/errors/extend/placeholder/missing.hrx
+++ b/spec/errors/extend/placeholder/missing.hrx
@@ -1,8 +1,8 @@
 <===> input.scss
-.baz {
-  @extend %foo;
-  color: green;
-}
+.baz {
+  @extend %foo;
+  color: green;
+}
 
 <===> error
 Error: ".baz" failed to @extend "%foo".
@@ -11,6 +11,13 @@ Error: ".baz" failed to @extend "%foo".
         on line 2 of input.scss
   Use --trace for backtrace.
 
+<===> error-libsass
+Error: The target selector was not found.
+       Use "@extend %foo !optional" to avoid this error.
+        on line 2 of input.scss
+>>     @extend %foo;
+   ------------^
+
 <===> error-dart-sass
 Error: The target selector was not found.
 Use "@extend %foo !optional" to avoid this error.
diff --git a/spec/errors/extend/selector/missing.hrx b/spec/errors/extend/selector/missing.hrx
index b64ef811f4..26f12d6501 100644
--- a/spec/errors/extend/selector/missing.hrx
+++ b/spec/errors/extend/selector/missing.hrx
@@ -1,8 +1,8 @@
 <===> input.scss
-.baz {
-  @extend .foo;
-  color: green;
-}
+.baz {
+  @extend .foo;
+  color: green;
+}
 
 <===> error
 Error: ".baz" failed to @extend ".foo".
@@ -11,6 +11,13 @@ Error: ".baz" failed to @extend ".foo".
         on line 2 of input.scss
   Use --trace for backtrace.
 
+<===> error-libsass
+Error: The target selector was not found.
+       Use "@extend .foo !optional" to avoid this error.
+        on line 2 of input.scss
+>>     @extend .foo;
+   ------------^
+
 <===> error-dart-sass
 Error: The target selector was not found.
 Use "@extend .foo !optional" to avoid this error.
diff --git a/spec/extend-tests/007_test_multiple_extends_with_single_extender_and_single_target.hrx b/spec/extend-tests/007_test_multiple_extends_with_single_extender_and_single_target.hrx
index b7fa524872..b4d5d3aa2d 100644
--- a/spec/extend-tests/007_test_multiple_extends_with_single_extender_and_single_target.hrx
+++ b/spec/extend-tests/007_test_multiple_extends_with_single_extender_and_single_target.hrx
@@ -3,11 +3,6 @@
 .baz {@extend .foo; @extend .bar}
 
 <===> output.css
-.foo .bar, .baz .bar, .foo .baz, .baz .baz {
-  a: b;
-}
-
-<===> output-dart-sass.css
 .foo .bar, .foo .baz, .baz .bar, .baz .baz {
   a: b;
 }
diff --git a/spec/extend-tests/009_test_multiple_extends_with_multiple_extenders_and_single_target.hrx b/spec/extend-tests/009_test_multiple_extends_with_multiple_extenders_and_single_target.hrx
index 7be32d2a17..959d5bcbf8 100644
--- a/spec/extend-tests/009_test_multiple_extends_with_multiple_extenders_and_single_target.hrx
+++ b/spec/extend-tests/009_test_multiple_extends_with_multiple_extenders_and_single_target.hrx
@@ -4,11 +4,6 @@
 .bang {@extend .bar}
 
 <===> output.css
-.foo .bar, .baz .bar, .foo .bang, .baz .bang {
-  a: b;
-}
-
-<===> output-dart-sass.css
 .foo .bar, .foo .bang, .baz .bar, .baz .bang {
   a: b;
 }
diff --git a/spec/extend-tests/010_test_multiple_extends_with_multiple_extenders_and_single_target.hrx b/spec/extend-tests/010_test_multiple_extends_with_multiple_extenders_and_single_target.hrx
index 4a320b0663..3cf05ca548 100644
--- a/spec/extend-tests/010_test_multiple_extends_with_multiple_extenders_and_single_target.hrx
+++ b/spec/extend-tests/010_test_multiple_extends_with_multiple_extenders_and_single_target.hrx
@@ -4,11 +4,6 @@
 .bang {@extend .bar}
 
 <===> output.css
-.foo.bar, .bar.baz, .baz.bang, .foo.bang {
-  a: b;
-}
-
-<===> output-dart-sass.css
 .foo.bar, .foo.bang, .bar.baz, .baz.bang {
   a: b;
 }
diff --git a/spec/extend-tests/011_test_chained_extends.hrx b/spec/extend-tests/011_test_chained_extends.hrx
index c1ff0e2113..7d7c0f5119 100644
--- a/spec/extend-tests/011_test_chained_extends.hrx
+++ b/spec/extend-tests/011_test_chained_extends.hrx
@@ -5,11 +5,6 @@
 .bip {@extend .bar}
 
 <===> output.css
-.foo, .bar, .baz, .bip {
-  a: b;
-}
-
-<===> output-dart-sass.css
 .foo, .bar, .bip, .baz {
   a: b;
 }
diff --git a/spec/extend-tests/086.1_test_pseudoelement_goes_lefter_than_not.hrx b/spec/extend-tests/086.1_test_pseudoelement_goes_lefter_than_not.hrx
index 8047195717..df60de9d02 100644
--- a/spec/extend-tests/086.1_test_pseudoelement_goes_lefter_than_not.hrx
+++ b/spec/extend-tests/086.1_test_pseudoelement_goes_lefter_than_not.hrx
@@ -12,11 +12,6 @@ d::e {
   @extend c;
 }
 <===> output.css
-b:not(:first-child):after, c:s, d:s::e {
-  x: y;
-}
-
-<===> output-dart-sass.css
 c:s, d:s::e, b:after:not(:first-child) {
   x: y;
 }
diff --git a/spec/extend-tests/091_test_redundant_selector_elimination.hrx b/spec/extend-tests/091_test_redundant_selector_elimination.hrx
index 9fc84df931..ac87d0d742 100644
--- a/spec/extend-tests/091_test_redundant_selector_elimination.hrx
+++ b/spec/extend-tests/091_test_redundant_selector_elimination.hrx
@@ -1,14 +1,9 @@
-<===> options.yml
----
-:ignore_for:
-- dart-sass
-
 <===> input.scss
 .foo.bar {a: b}
 .x {@extend .foo, .bar}
 .y {@extend .foo, .bar}
 
 <===> output.css
-.foo.bar, .x, .y {
+.foo.bar, .y, .x {
   a: b;
 }
diff --git a/spec/extend-tests/150_test_combinator_unification_tilde_plus.hrx b/spec/extend-tests/150_test_combinator_unification_tilde_plus.hrx
index fe260191c3..1fa111c529 100644
--- a/spec/extend-tests/150_test_combinator_unification_tilde_plus.hrx
+++ b/spec/extend-tests/150_test_combinator_unification_tilde_plus.hrx
@@ -3,11 +3,6 @@
 .b + y {@extend x}
 
 <===> output.css
-.a ~ x, .a ~ .b + y, .a.b + y {
-  a: b;
-}
-
-<===> output-dart-sass.css
 .a ~ x, .a ~ .b + y, .b.a + y {
   a: b;
 }
diff --git a/spec/extend-tests/178_test_combinator_unification_with_newlines.hrx b/spec/extend-tests/178_test_combinator_unification_with_newlines.hrx
index 426a3f3e7c..30e179c5fd 100644
--- a/spec/extend-tests/178_test_combinator_unification_with_newlines.hrx
+++ b/spec/extend-tests/178_test_combinator_unification_with_newlines.hrx
@@ -19,8 +19,7 @@ y {@extend x}
 }
 
 <===> output-libsass.css
-.a >
-.b + x, .c.a >
-.d.b + y {
+.a > .b
++ x, .c.a > .d.b + y {
   a: b;
 }
diff --git a/spec/libsass-todo-tests/180_test_basic_extend_loop.hrx b/spec/extend-tests/180_test_basic_extend_loop.hrx
similarity index 100%
rename from spec/libsass-todo-tests/180_test_basic_extend_loop.hrx
rename to spec/extend-tests/180_test_basic_extend_loop.hrx
diff --git a/spec/libsass-todo-tests/181_test_three_level_extend_loop.hrx b/spec/extend-tests/181_test_three_level_extend_loop.hrx
similarity index 100%
rename from spec/libsass-todo-tests/181_test_three_level_extend_loop.hrx
rename to spec/extend-tests/181_test_three_level_extend_loop.hrx
diff --git a/spec/extend-tests/191_test_placeholder_selector_with_multiple_extenders.hrx b/spec/extend-tests/191_test_placeholder_selector_with_multiple_extenders.hrx
index 0e7addb98e..dc11bd0d16 100644
--- a/spec/extend-tests/191_test_placeholder_selector_with_multiple_extenders.hrx
+++ b/spec/extend-tests/191_test_placeholder_selector_with_multiple_extenders.hrx
@@ -4,11 +4,6 @@
 .baz {@extend %foo}
 
 <===> output.css
-.bar, .baz {
-  color: blue;
-}
-
-<===> output-dart-sass.css
 .baz, .bar {
   color: blue;
 }
diff --git a/spec/extend-tests/215_test_multiple_source_redundancy_elimination.hrx b/spec/extend-tests/215_test_multiple_source_redundancy_elimination.hrx
index 75d2088abe..2787052481 100644
--- a/spec/extend-tests/215_test_multiple_source_redundancy_elimination.hrx
+++ b/spec/extend-tests/215_test_multiple_source_redundancy_elimination.hrx
@@ -11,15 +11,6 @@
 .test-case {@extend %default-style}
 
 <===> output.css
-.test-case, .test-case:active {
-  color: red;
-}
-
-.test-case:hover {
-  color: green;
-}
-
-<===> output-dart-sass.css
 .test-case:active, .test-case {
   color: red;
 }
diff --git a/spec/extend-tests/218_test_nested_extend_specificity.hrx b/spec/extend-tests/218_test_nested_extend_specificity.hrx
index dc0d590d26..3cb77cf105 100644
--- a/spec/extend-tests/218_test_nested_extend_specificity.hrx
+++ b/spec/extend-tests/218_test_nested_extend_specificity.hrx
@@ -7,11 +7,6 @@ a {
 }
 
 <===> output.css
-a :b, a :b:c {
-  a: b;
-}
-
-<===> output-dart-sass.css
 a :b:c, a :b {
   a: b;
 }
diff --git a/spec/extend-tests/222_test_newline_near_combinator.hrx b/spec/extend-tests/222_test_newline_near_combinator.hrx
index a0302ef674..18a0a16248 100644
--- a/spec/extend-tests/222_test_newline_near_combinator.hrx
+++ b/spec/extend-tests/222_test_newline_near_combinator.hrx
@@ -15,3 +15,8 @@
 .b y {
   a: b;
 }
+
+<===> output-libsass.css
+.a + .b x, .a + .b .c y, .c .a + .b y {
+  a: b;
+}
diff --git a/spec/extend-tests/234_test_extend_cross_branch_redundancy_elimination.hrx b/spec/extend-tests/234_test_extend_cross_branch_redundancy_elimination.hrx
index af3ae39836..a46a5c71ac 100644
--- a/spec/extend-tests/234_test_extend_cross_branch_redundancy_elimination.hrx
+++ b/spec/extend-tests/234_test_extend_cross_branch_redundancy_elimination.hrx
@@ -5,11 +5,6 @@
 .a .d {@extend %y}
 
 <===> output.css
-.e .a .c .d, .a .c .e .d, .e .b .c .a .d, .b .c .a .e .d {
-  a: b;
-}
-
-<===> output-dart-sass.css
 .e .a .c .d, .e .b .c .a .d, .a .e .b .c .d, .a .c .e .d, .b .c .e .a .d {
   a: b;
 }
diff --git a/spec/extend-tests/escaped_selector.hrx b/spec/extend-tests/escaped_selector.hrx
index 42ce20af61..32fd34ec80 100644
--- a/spec/extend-tests/escaped_selector.hrx
+++ b/spec/extend-tests/escaped_selector.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
 
 <===> input.scss
 // Escapes in selectors' identifiers should be normalized before `@extend` is
diff --git a/spec/extend-tests/extend-result-of-extend.hrx b/spec/extend-tests/extend-result-of-extend.hrx
index 3702615c2c..7fd147e6bf 100644
--- a/spec/extend-tests/extend-result-of-extend.hrx
+++ b/spec/extend-tests/extend-result-of-extend.hrx
@@ -1,8 +1,3 @@
-<===> options.yml
----
-:todo:
-- libsass
-
 <===> input.scss
 // The result of :not(.c) being extended should itself be extenable.
 .a {@extend :not(.b)}
diff --git a/spec/extend-tests/extend-self.hrx b/spec/extend-tests/extend-self.hrx
index 54f6c22c01..3004638027 100644
--- a/spec/extend-tests/extend-self.hrx
+++ b/spec/extend-tests/extend-self.hrx
@@ -1,7 +1,3 @@
-<===> options.yml
----
-:todo:
-- libsass
 <===> input.scss
 // This shouldn't change the selector.
 .c, .a .b .c, .a .c .b {x: y; @extend .c}
diff --git a/spec/extend-tests/nested-compound-unification.hrx b/spec/extend-tests/nested-compound-unification.hrx
index 2f66432e78..68beff2ede 100644
--- a/spec/extend-tests/nested-compound-unification.hrx
+++ b/spec/extend-tests/nested-compound-unification.hrx
@@ -6,11 +6,6 @@
 .e.f {x: y}
 
 <===> output.css
-.e.f, .a .f.b, .a .c .b.d, .c .a .b.d, .c .e.d {
-  x: y;
-}
-
-<===> output-dart-sass.css
 .e.f, .a .f.b, .c .e.d, .a .c .b.d, .c .a .b.d {
   x: y;
 }
diff --git a/spec/extend-tests/selector_list.hrx b/spec/extend-tests/selector_list.hrx
index 00b4c5534c..317c9eb3b3 100644
--- a/spec/extend-tests/selector_list.hrx
+++ b/spec/extend-tests/selector_list.hrx
@@ -9,15 +9,6 @@
 .bang {@extend .foo #{","} .bar}
 
 <===> output.css
-.foo, .baz, .bang {
-  a: b;
-}
-
-.bar, .baz, .bang {
-  x: y;
-}
-
-<===> output-dart-sass.css
 .foo, .bang, .baz {
   a: b;
 }
diff --git a/spec/libsass-todo-tests/extend-tests/200_test_extend_with_subject_transfers_subject_to_extender.hrx b/spec/extend-tests/subject-operator/200_test_extend_with_subject_transfers_subject_to_extender.hrx
similarity index 97%
rename from spec/libsass-todo-tests/extend-tests/200_test_extend_with_subject_transfers_subject_to_extender.hrx
rename to spec/extend-tests/subject-operator/200_test_extend_with_subject_transfers_subject_to_extender.hrx
index 126c96d505..9e390055a5 100644
--- a/spec/libsass-todo-tests/extend-tests/200_test_extend_with_subject_transfers_subject_to_extender.hrx
+++ b/spec/extend-tests/subject-operator/200_test_extend_with_subject_transfers_subject_to_extender.hrx
@@ -2,6 +2,7 @@
 ---
 :ignore_for:
 - dart-sass
+- libsass
 
 <===> input.scss
 foo bar! baz {a: b}
diff --git a/spec/libsass-todo-tests/extend-tests/201_test_extend_with_subject_transfers_subject_to_extender.hrx b/spec/extend-tests/subject-operator/201_test_extend_with_subject_transfers_subject_to_extender.hrx
similarity index 97%
rename from spec/libsass-todo-tests/extend-tests/201_test_extend_with_subject_transfers_subject_to_extender.hrx
rename to spec/extend-tests/subject-operator/201_test_extend_with_subject_transfers_subject_to_extender.hrx
index b22ff55fb8..7d22cfc15f 100644
--- a/spec/libsass-todo-tests/extend-tests/201_test_extend_with_subject_transfers_subject_to_extender.hrx
+++ b/spec/extend-tests/subject-operator/201_test_extend_with_subject_transfers_subject_to_extender.hrx
@@ -2,6 +2,7 @@
 ---
 :ignore_for:
 - dart-sass
+- libsass
 
 <===> input.scss
 foo.x bar.y! baz.z {a: b}
diff --git a/spec/libsass-todo-tests/extend-tests/202_test_extend_with_subject_retains_subject_on_target.hrx b/spec/extend-tests/subject-operator/202_test_extend_with_subject_retains_subject_on_target.hrx
similarity index 97%
rename from spec/libsass-todo-tests/extend-tests/202_test_extend_with_subject_retains_subject_on_target.hrx
rename to spec/extend-tests/subject-operator/202_test_extend_with_subject_retains_subject_on_target.hrx
index cb99aa98c0..71d7c2ab55 100644
--- a/spec/libsass-todo-tests/extend-tests/202_test_extend_with_subject_retains_subject_on_target.hrx
+++ b/spec/extend-tests/subject-operator/202_test_extend_with_subject_retains_subject_on_target.hrx
@@ -2,6 +2,7 @@
 ---
 :ignore_for:
 - dart-sass
+- libsass
 
 <===> input.scss
 .foo! .bar {a: b}
diff --git a/spec/libsass-todo-tests/extend-tests/203_test_extend_with_subject_transfers_subject_to_target.hrx b/spec/extend-tests/subject-operator/203_test_extend_with_subject_transfers_subject_to_target.hrx
similarity index 91%
rename from spec/libsass-todo-tests/extend-tests/203_test_extend_with_subject_transfers_subject_to_target.hrx
rename to spec/extend-tests/subject-operator/203_test_extend_with_subject_transfers_subject_to_target.hrx
index e543381d3c..c6e015a240 100644
--- a/spec/libsass-todo-tests/extend-tests/203_test_extend_with_subject_transfers_subject_to_target.hrx
+++ b/spec/extend-tests/subject-operator/203_test_extend_with_subject_transfers_subject_to_target.hrx
@@ -1,3 +1,8 @@
+<===> options.yml
+---
+:ignore_for:
+- libsass
+
 <===> input.scss
 a.foo .bar {a: b}
 .bip .bap! {@extend .foo}
diff --git a/spec/libsass-todo-tests/extend-tests/204_test_extend_with_subject_retains_subject_on_extender.hrx b/spec/extend-tests/subject-operator/204_test_extend_with_subject_retains_subject_on_extender.hrx
similarity index 97%
rename from spec/libsass-todo-tests/extend-tests/204_test_extend_with_subject_retains_subject_on_extender.hrx
rename to spec/extend-tests/subject-operator/204_test_extend_with_subject_retains_subject_on_extender.hrx
index f89618fd6e..8cded5f146 100644
--- a/spec/libsass-todo-tests/extend-tests/204_test_extend_with_subject_retains_subject_on_extender.hrx
+++ b/spec/extend-tests/subject-operator/204_test_extend_with_subject_retains_subject_on_extender.hrx
@@ -2,6 +2,7 @@
 ---
 :ignore_for:
 - dart-sass
+- libsass
 
 <===> input.scss
 .foo .bar {a: b}
diff --git a/spec/libsass-todo-tests/extend-tests/205_test_extend_with_subject_fails_with_conflicting_subject.hrx b/spec/extend-tests/subject-operator/205_test_extend_with_subject_fails_with_conflicting_subject.hrx
similarity index 98%
rename from spec/libsass-todo-tests/extend-tests/205_test_extend_with_subject_fails_with_conflicting_subject.hrx
rename to spec/extend-tests/subject-operator/205_test_extend_with_subject_fails_with_conflicting_subject.hrx
index 39bbd5e941..0f9ffbc4c5 100644
--- a/spec/libsass-todo-tests/extend-tests/205_test_extend_with_subject_fails_with_conflicting_subject.hrx
+++ b/spec/extend-tests/subject-operator/205_test_extend_with_subject_fails_with_conflicting_subject.hrx
@@ -2,6 +2,7 @@
 ---
 :ignore_for:
 - dart-sass
+- libsass
 
 <===> input.scss
 x! .bar {a: b}
diff --git a/spec/libsass-todo-tests/extend-tests/notes.txt b/spec/extend-tests/subject-operator/notes.txt
similarity index 100%
rename from spec/libsass-todo-tests/extend-tests/notes.txt
rename to spec/extend-tests/subject-operator/notes.txt
diff --git a/spec/libsass-closed-issues/issue_100.hrx b/spec/libsass-closed-issues/issue_100.hrx
index 8047ae1090..b2593a1a0a 100644
--- a/spec/libsass-closed-issues/issue_100.hrx
+++ b/spec/libsass-closed-issues/issue_100.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
 
 <===> input.scss
 $endColor: red;
diff --git a/spec/libsass-closed-issues/issue_1029.hrx b/spec/libsass-closed-issues/issue_1029.hrx
index bfaba61abd..816df0d0a1 100644
--- a/spec/libsass-closed-issues/issue_1029.hrx
+++ b/spec/libsass-closed-issues/issue_1029.hrx
@@ -13,15 +13,6 @@
 }
 
 <===> output.css
-.week-start-1 .month-start-2, .week-start-2 .month-start-1 {
-  margin-left: 1px;
-}
-
-.week-start-1 .month-start-1, .week-start-2 .month-start-2 {
-  margin-left: 2px;
-}
-
-<===> output-dart-sass.css
 .week-start-2 .month-start-1, .week-start-1 .month-start-2 {
   margin-left: 1px;
 }
diff --git a/spec/libsass-closed-issues/issue_1063.hrx b/spec/libsass-closed-issues/issue_1063.hrx
index 8d7309ec2c..b13cc08c25 100644
--- a/spec/libsass-closed-issues/issue_1063.hrx
+++ b/spec/libsass-closed-issues/issue_1063.hrx
@@ -9,11 +9,6 @@ a {
 }
 
 <===> output.css
-a > b > x, a > b > c > x {
-  display: block;
-}
-
-<===> output-dart-sass.css
 a > b > c > x, a > b > x {
   display: block;
 }
diff --git a/spec/libsass-closed-issues/issue_1081.hrx b/spec/libsass-closed-issues/issue_1081.hrx
index 19d1d20603..a71d39a06a 100644
--- a/spec/libsass-closed-issues/issue_1081.hrx
+++ b/spec/libsass-closed-issues/issue_1081.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :warning_todo:
-- libsass # sass/libsass#2834
+- sass/libsass#2834
 
 <===> input.scss
 $foo: foo !global !default;
diff --git a/spec/libsass-closed-issues/issue_1091.hrx b/spec/libsass-closed-issues/issue_1091.hrx
index f7a1acade8..5b8cab090a 100644
--- a/spec/libsass-closed-issues/issue_1091.hrx
+++ b/spec/libsass-closed-issues/issue_1091.hrx
@@ -13,11 +13,6 @@
 }
 
 <===> output.css
-.a, .b .c, .b .d > .e, .d > .e {
-  top: 0;
-}
-
-<===> output-dart-sass.css
 .a, .d > .e, .b .c, .b .d > .e {
   top: 0;
 }
diff --git a/spec/libsass-closed-issues/issue_1210/extend.hrx b/spec/libsass-closed-issues/issue_1210/extend.hrx
index 453d5d19a1..41e6ac469b 100644
--- a/spec/libsass-closed-issues/issue_1210/extend.hrx
+++ b/spec/libsass-closed-issues/issue_1210/extend.hrx
@@ -41,17 +41,6 @@ bam {
 bar {
   color: red;
 }
-baz {
-  color: blue;
-}
-qux foo, bam foo {
-  color: green;
-}
-
-<===> output-dart-sass.css
-bar {
-  color: red;
-}
 
 baz {
   color: blue;
diff --git a/spec/libsass-closed-issues/issue_1218.hrx b/spec/libsass-closed-issues/issue_1218.hrx
index 96a4cf0fb1..b37438e353 100644
--- a/spec/libsass-closed-issues/issue_1218.hrx
+++ b/spec/libsass-closed-issues/issue_1218.hrx
@@ -12,18 +12,6 @@ $foo: 20px;
 }
 
 <===> output.css
-@media screen and (min-width: 20px) {
-  .bar {
-    width: 12px;
-  }
-}
-@media screen and (min-width: 0) {
-  .bar {
-    width: 12px;
-  }
-}
-
-<===> output-dart-sass.css
 @media screen and (min-width:20px) {
   .bar {
     width: 12px;
diff --git a/spec/libsass-closed-issues/issue_1224.hrx b/spec/libsass-closed-issues/issue_1224.hrx
index ba8fc6707e..9b27ef5c94 100644
--- a/spec/libsass-closed-issues/issue_1224.hrx
+++ b/spec/libsass-closed-issues/issue_1224.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#1224
+- sass/libsass#1224
 <===> input.scss
 @media all and (max-width: 768px) {
   @media only screen {
diff --git a/spec/libsass-closed-issues/issue_1231/options.yml b/spec/libsass-closed-issues/issue_1231/options.yml
index 3bb0723bb6..8380261167 100644
--- a/spec/libsass-closed-issues/issue_1231/options.yml
+++ b/spec/libsass-closed-issues/issue_1231/options.yml
@@ -1,3 +1,3 @@
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
diff --git a/spec/libsass-closed-issues/issue_1248.hrx b/spec/libsass-closed-issues/issue_1248.hrx
index 86aa37d738..2981b2d4f4 100644
--- a/spec/libsass-closed-issues/issue_1248.hrx
+++ b/spec/libsass-closed-issues/issue_1248.hrx
@@ -10,11 +10,6 @@
 }
 
 <===> output.css
-.a.b .c, .a .c, .a.b .d, .a .d {
-  top: 0;
-}
-
-<===> output-dart-sass.css
 .a.b .c, .a .c, .a .d {
   top: 0;
 }
diff --git a/spec/libsass-closed-issues/issue_1263.hrx b/spec/libsass-closed-issues/issue_1263.hrx
index 8fd3dc8a2d..40c030f7ba 100644
--- a/spec/libsass-closed-issues/issue_1263.hrx
+++ b/spec/libsass-closed-issues/issue_1263.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2721
+- sass/libsass#2721
 
 <===> input.scss
 foo {
diff --git a/spec/libsass-todo-issues/issue_1322.hrx b/spec/libsass-closed-issues/issue_1322.hrx
similarity index 66%
rename from spec/libsass-todo-issues/issue_1322.hrx
rename to spec/libsass-closed-issues/issue_1322.hrx
index 3648482125..f939874c03 100644
--- a/spec/libsass-todo-issues/issue_1322.hrx
+++ b/spec/libsass-closed-issues/issue_1322.hrx
@@ -11,12 +11,5 @@ $bar: "min-width:400px";
 @import url(foo.css) (min-width: 400px);
 @import url(foo.css) (min-width: 400px);
 @import url(foo.css) (min-width: 400px);
-@import url(foo.css) (min-width: 400px);
-@import url(foo.css) (min-width: 400px);
-
-<===> output-dart-sass.css
-@import url(foo.css) (min-width: 400px);
-@import url(foo.css) (min-width: 400px);
-@import url(foo.css) (min-width: 400px);
 @import url(foo.css) (min-width:400px);
 @import url(foo.css) (min-width:400px);
diff --git a/spec/libsass-closed-issues/issue_1394.hrx b/spec/libsass-closed-issues/issue_1394.hrx
index 11e471fcd0..2e81ea6e98 100644
--- a/spec/libsass-closed-issues/issue_1394.hrx
+++ b/spec/libsass-closed-issues/issue_1394.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
 
 <===> input.scss
 foo {
diff --git a/spec/libsass-closed-issues/issue_1398.hrx b/spec/libsass-closed-issues/issue_1398.hrx
index 99abee583a..98114dbdeb 100644
--- a/spec/libsass-closed-issues/issue_1398.hrx
+++ b/spec/libsass-closed-issues/issue_1398.hrx
@@ -6,13 +6,6 @@
 }
 
 <===> output.css
-@media screen and (hux: 3 / 4) {
-  foo {
-    bar: baz;
-  }
-}
-
-<===> output-dart-sass.css
 @media screen and (hux: 3/4) {
   foo {
     bar: baz;
diff --git a/spec/libsass-closed-issues/issue_1405.hrx b/spec/libsass-closed-issues/issue_1405.hrx
index af43ca3862..7df4cebe16 100644
--- a/spec/libsass-closed-issues/issue_1405.hrx
+++ b/spec/libsass-closed-issues/issue_1405.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
 
 <===> input.scss
 div {
diff --git a/spec/libsass-closed-issues/issue_1418/dynamic.hrx b/spec/libsass-closed-issues/issue_1418/dynamic.hrx
index 178f3ca3f3..273fc45458 100644
--- a/spec/libsass-closed-issues/issue_1418/dynamic.hrx
+++ b/spec/libsass-closed-issues/issue_1418/dynamic.hrx
@@ -11,6 +11,16 @@ Error: Function missing doesn't support keyword arguments
         on line 2 of input.scss
   Use --trace for backtrace.
 
+<===> error-libsass
+DEPRECATION WARNING: Passing a string to call() is deprecated and will be illegal
+in Sass 4.0. Use call(get-function("missing")) instead.
+
+Error: Plain CSS function missing doesn't support keyword arguments
+        on line 2:10 of inpit.scss, in function `call`
+        from line 2:10 of input.scss
+>>   color: call(missing, $a: b);
+   ---------^
+
 <===> error-dart-sass
 DEPRECATION WARNING: Passing a string to call() is deprecated and will be illegal
 in Sass 4.0. Use call(get-function(missing)) instead.
diff --git a/spec/libsass-closed-issues/issue_1418/static.hrx b/spec/libsass-closed-issues/issue_1418/static.hrx
index 7f59779cf7..a1bc1b9bb4 100644
--- a/spec/libsass-closed-issues/issue_1418/static.hrx
+++ b/spec/libsass-closed-issues/issue_1418/static.hrx
@@ -1,8 +1,3 @@
-<===> options.yml
----
-:todo:
-- libsass
-
 <===> input.scss
 foo {
     color: missing($a: b);
diff --git a/spec/libsass-closed-issues/issue_1419/unquoted.hrx b/spec/libsass-closed-issues/issue_1419/unquoted.hrx
index e882a9b34d..70ad6913d7 100644
--- a/spec/libsass-closed-issues/issue_1419/unquoted.hrx
+++ b/spec/libsass-closed-issues/issue_1419/unquoted.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
 
 <===> input.scss
 foo {
diff --git a/spec/libsass-closed-issues/issue_1482.hrx b/spec/libsass-closed-issues/issue_1482.hrx
index f4919fd011..65ff58b01f 100644
--- a/spec/libsass-closed-issues/issue_1482.hrx
+++ b/spec/libsass-closed-issues/issue_1482.hrx
@@ -16,11 +16,6 @@ type {
 }
 
 <===> output.css
-.mango, type__else, .qualified__else {
-  color: red;
-}
-
-<===> output-dart-sass.css
 .mango, .qualified__else, type__else {
   color: red;
 }
diff --git a/spec/libsass-closed-issues/issue_1527/extend.hrx b/spec/libsass-closed-issues/issue_1527/extend.hrx
index cdc22de27c..97facac13e 100644
--- a/spec/libsass-closed-issues/issue_1527/extend.hrx
+++ b/spec/libsass-closed-issues/issue_1527/extend.hrx
@@ -8,6 +8,12 @@ Error: Can't extend &: can't extend parent selectors
         on line 2 of input.scss
   Use --trace for backtrace.
 
+<===> error-libsass
+Error: Parent selectors aren't allowed here.
+        on line 2:11 of input.scss
+>>   @extend &;
+   ----------^
+
 <===> error-dart-sass
 Error: Parent selectors aren't allowed here.
   ,
diff --git a/spec/libsass-closed-issues/issue_1527/selector/first.hrx b/spec/libsass-closed-issues/issue_1527/selector/first.hrx
index 7c977db24e..5a0af0382f 100644
--- a/spec/libsass-closed-issues/issue_1527/selector/first.hrx
+++ b/spec/libsass-closed-issues/issue_1527/selector/first.hrx
@@ -8,6 +8,11 @@ Error: Base-level rules cannot contain the parent-selector-referencing character
         on line 1 of input.scss
   Use --trace for backtrace.
 
+<===> error-libsass
+Error: Top-level selectors may not contain the parent selector "&".
+        on line 1 of input.scss
+>> & foo {
+
 <===> error-dart-sass
 Error: Top-level selectors may not contain the parent selector "&".
   ,
diff --git a/spec/libsass-closed-issues/issue_1527/selector/last.hrx b/spec/libsass-closed-issues/issue_1527/selector/last.hrx
index bf19719202..f310dad790 100644
--- a/spec/libsass-closed-issues/issue_1527/selector/last.hrx
+++ b/spec/libsass-closed-issues/issue_1527/selector/last.hrx
@@ -8,6 +8,11 @@ Error: Base-level rules cannot contain the parent-selector-referencing character
         on line 1 of input.scss
   Use --trace for backtrace.
 
+<===> error-libsass
+Error: Top-level selectors may not contain the parent selector "&".
+        on line 1 of input.scss
+>> foo & {
+
 <===> error-dart-sass
 Error: Top-level selectors may not contain the parent selector "&".
   ,
diff --git a/spec/libsass-closed-issues/issue_1527/selector/only.hrx b/spec/libsass-closed-issues/issue_1527/selector/only.hrx
index dfc6805907..f84fc20180 100644
--- a/spec/libsass-closed-issues/issue_1527/selector/only.hrx
+++ b/spec/libsass-closed-issues/issue_1527/selector/only.hrx
@@ -6,6 +6,11 @@ Error: Base-level rules cannot contain the parent-selector-referencing character
         on line 1 of input.scss
   Use --trace for backtrace.
 
+<===> error-libsass
+Error: Top-level selectors may not contain the parent selector "&".
+        on line 1 of input.scss
+>> & {}
+
 <===> error-dart-sass
 Error: Top-level selectors may not contain the parent selector "&".
   ,
diff --git a/spec/libsass-closed-issues/issue_1569.hrx b/spec/libsass-closed-issues/issue_1569.hrx
index 31f6863c2c..b67b90955b 100644
--- a/spec/libsass-closed-issues/issue_1569.hrx
+++ b/spec/libsass-closed-issues/issue_1569.hrx
@@ -14,6 +14,12 @@ Error: Base-level rules cannot contain the parent-selector-referencing character
         on line 2 of input.scss
   Use --trace for backtrace.
 
+<===> error-libsass
+Error: Top-level selectors may not contain the parent selector "&".
+        on line 2 of input.scss
+>> .nihilo & {
+   ^
+
 <===> error-dart-sass
 Error: Top-level selectors may not contain the parent selector "&".
   ,
diff --git a/spec/libsass-closed-issues/issue_1632.hrx b/spec/libsass-closed-issues/issue_1632.hrx
index bcf9da4bd3..81b707227a 100644
--- a/spec/libsass-closed-issues/issue_1632.hrx
+++ b/spec/libsass-closed-issues/issue_1632.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :warning_todo:
-- libsass # sass/libsass#2834
+- sass/libsass#2834
 
 <===> input.scss
 $foo: \/ !global;
diff --git a/spec/libsass-closed-issues/issue_1644/complex.hrx b/spec/libsass-closed-issues/issue_1644/complex.hrx
index 63d8151068..cfe18ed0c1 100644
--- a/spec/libsass-closed-issues/issue_1644/complex.hrx
+++ b/spec/libsass-closed-issues/issue_1644/complex.hrx
@@ -41,6 +41,14 @@ Error: Base-level rules cannot contain the parent-selector-referencing character
         from line 29 of input.scss
   Use --trace for backtrace.
 
+<===> error-libsass
+Error: Top-level selectors may not contain the parent selector "&".
+        on line 22:9 of input.scss, in mixin `grid-media-query`
+        from line 29:12 of input.scss
+>>     body.immobile & {
+
+   ----^
+
 <===> error-dart-sass
 Error: Top-level selectors may not contain the parent selector "&".
    ,
diff --git a/spec/libsass-closed-issues/issue_1644/mixin-parent.hrx b/spec/libsass-closed-issues/issue_1644/mixin-parent.hrx
index 7026a52d99..5b9fa1d989 100644
--- a/spec/libsass-closed-issues/issue_1644/mixin-parent.hrx
+++ b/spec/libsass-closed-issues/issue_1644/mixin-parent.hrx
@@ -16,6 +16,13 @@ Error: Base-level rules cannot contain the parent-selector-referencing character
         from line 5 of input.scss
   Use --trace for backtrace.
 
+<===> error-libsass
+Error: Top-level selectors may not contain the parent selector "&".
+        on line 2:5 of input.scss, in mixin `parent`
+        from line 5:12 of input.scss
+>>     body.immobile & {
+   ----^
+
 <===> error-dart-sass
 Error: Top-level selectors may not contain the parent selector "&".
   ,
diff --git a/spec/libsass-closed-issues/issue_1650/negative.hrx b/spec/libsass-closed-issues/issue_1650/negative.hrx
index 8191f71d53..af1d50806f 100644
--- a/spec/libsass-closed-issues/issue_1650/negative.hrx
+++ b/spec/libsass-closed-issues/issue_1650/negative.hrx
@@ -5,6 +5,7 @@
 :nth-of-type(2n  -  1),
 :nth-of-type( 2n  -  1 )
 { color: red; }
+
 <===> output.css
 :nth-of-type(2n-1),
 :nth-of-type(2n- 1),
@@ -13,12 +14,3 @@
 :nth-of-type(2n - 1) {
   color: red;
 }
-
-<===> output-libsass.css
-:nth-of-type(2n-1),
-:nth-of-type(2n-  1),
-:nth-of-type(2n  -1),
-:nth-of-type(2n  -  1),
-:nth-of-type(2n  -  1) {
-  color: red;
-}
diff --git a/spec/libsass-closed-issues/issue_1650/positive.hrx b/spec/libsass-closed-issues/issue_1650/positive.hrx
index c639f72632..949899979a 100644
--- a/spec/libsass-closed-issues/issue_1650/positive.hrx
+++ b/spec/libsass-closed-issues/issue_1650/positive.hrx
@@ -13,12 +13,3 @@
 :nth-of-type(2n + 1) {
   color: red;
 }
-
-<===> output-libsass.css
-:nth-of-type(2n+1),
-:nth-of-type(2n+  1),
-:nth-of-type(2n  +1),
-:nth-of-type(2n  +  1),
-:nth-of-type(2n  +  1) {
-  color: red;
-}
diff --git a/spec/libsass-closed-issues/issue_1670.hrx b/spec/libsass-closed-issues/issue_1670.hrx
index 377aee30c9..5c3cf73128 100644
--- a/spec/libsass-closed-issues/issue_1670.hrx
+++ b/spec/libsass-closed-issues/issue_1670.hrx
@@ -10,6 +10,13 @@ Error: ".this-should-error" failed to @extend "%an-undefined-placeholder".
         on line 2 of input.scss
   Use --trace for backtrace.
 
+<===> error-libsass
+Error: The target selector was not found.
+       Use "@extend %an-undefined-placeholder !optional" to avoid this error.
+        on line 2 of input.scss
+>>     @extend %an-undefined-placeholder;
+   ------------^
+
 <===> error-dart-sass
 Error: The target selector was not found.
 Use "@extend %an-undefined-placeholder !optional" to avoid this error.
diff --git a/spec/libsass-closed-issues/issue_1710.hrx b/spec/libsass-closed-issues/issue_1710.hrx
index 085e539c1a..661059e816 100644
--- a/spec/libsass-closed-issues/issue_1710.hrx
+++ b/spec/libsass-closed-issues/issue_1710.hrx
@@ -6,11 +6,6 @@ ul, ol {
   }
 
 <===> output.css
-ul ul, ol ul, ul ol, ol ol {
-  display: block;
-}
-
-<===> output-dart-sass.css
 ul ul, ul ol, ol ul, ol ol {
   display: block;
 }
diff --git a/spec/libsass-todo-issues/issue_1720.hrx b/spec/libsass-closed-issues/issue_1720.hrx
similarity index 60%
rename from spec/libsass-todo-issues/issue_1720.hrx
rename to spec/libsass-closed-issues/issue_1720.hrx
index a76fb4f138..9d72e11c29 100644
--- a/spec/libsass-todo-issues/issue_1720.hrx
+++ b/spec/libsass-closed-issues/issue_1720.hrx
@@ -8,6 +8,12 @@ Error: Invalid CSS after "}": expected ";", was ""
         on line 4 of input.scss
   Use --trace for backtrace.
 
+<===> error-libsass
+Error: Invalid CSS after "    a: a#{b": expected expression (e.g. 1px, bold), was "//}c;"
+        on line 2:10 of input.scss
+>>   a: a#{b//}c;
+   ---------^
+
 <===> error-dart-sass
 Error: expected "}".
   ,
diff --git a/spec/libsass-closed-issues/issue_1729.hrx b/spec/libsass-closed-issues/issue_1729.hrx
index 055f279821..e5c0f689a0 100644
--- a/spec/libsass-closed-issues/issue_1729.hrx
+++ b/spec/libsass-closed-issues/issue_1729.hrx
@@ -47,11 +47,6 @@ b::foo(2){
 }
 
 <===> output.css
-a::foo(1), a::foo(2), b::foo(1), b::foo(2), :bar(1), :bar(2), :bar(3), [foo], [bar], [baz], [bar="1"], [bar="2"], [bar="3"] {
-  font-size: 1em;
-}
-
-<===> output-dart-sass.css
 [bar="3"], [bar="2"], [bar="1"], [baz], [bar], [foo], :bar(3), :bar(2), :bar(1), b::foo(2), b::foo(1), a::foo(2), a::foo(1) {
   font-size: 1em;
 }
diff --git a/spec/libsass-closed-issues/issue_1916.hrx b/spec/libsass-closed-issues/issue_1916.hrx
index 24677aea45..54f30142b0 100644
--- a/spec/libsass-closed-issues/issue_1916.hrx
+++ b/spec/libsass-closed-issues/issue_1916.hrx
@@ -22,6 +22,13 @@ Error: ".btn:hover" failed to @extend ".z-depth-half-1".
         on line 13 of input.scss
   Use --trace for backtrace.
 
+<===> error-libsass
+Error: The target selector was not found.
+       Use "@extend .z-depth-half-1 !optional" to avoid this error.
+        on line 13 of input.scss
+>>     @extend .z-depth-half-1;
+   ------------^
+
 <===> error-dart-sass
 Error: The target selector was not found.
 Use "@extend .z-depth-half-1 !optional" to avoid this error.
diff --git a/spec/libsass-closed-issues/issue_1923.hrx b/spec/libsass-closed-issues/issue_1923.hrx
index 42114707e4..0aff68b79b 100644
--- a/spec/libsass-closed-issues/issue_1923.hrx
+++ b/spec/libsass-closed-issues/issue_1923.hrx
@@ -21,6 +21,13 @@ input.scss.
 input.scss
   Use --trace for backtrace.
 
+<===> error-libsass
+Error: You may not @extend selectors across media queries.
+      Use "@extend %btnBase !optional" to avoid this error.
+      on line 7:7 of inpit.scss, in mixin `mobile`
+      from line 11:12 of input.scss
+>>       @extend %btnBase
+
 <===> error-dart-sass
 Error: From line 1, column 1 of input.scss: 
   ,
diff --git a/spec/libsass-todo-issues/issue_2053.hrx b/spec/libsass-closed-issues/issue_2053.hrx
similarity index 81%
rename from spec/libsass-todo-issues/issue_2053.hrx
rename to spec/libsass-closed-issues/issue_2053.hrx
index 6512ae6d5a..952facd39c 100644
--- a/spec/libsass-todo-issues/issue_2053.hrx
+++ b/spec/libsass-closed-issues/issue_2053.hrx
@@ -1,23 +1,19 @@
-<===> options.yml
----
-:todo:
-- dart-sass
 <===> input.scss
-.foo[disabled] {
-    @extend .foo;
-    background: blue;
-  }
-.bar[disabled] {
-  foo {
-    @extend .bar;
-    background: blue;
-  }
-}
-foo {
-  .baz[disabled] {
-    @extend .baz;
-    background: blue;
-  }
+.foo[disabled] {
+    @extend .foo;
+    background: blue;
+  }
+.bar[disabled] {
+  foo {
+    @extend .bar;
+    background: blue;
+  }
+}
+foo {
+  .baz[disabled] {
+    @extend .baz;
+    background: blue;
+  }
 }
 <===> output.css
 .foo[disabled] {
@@ -28,6 +24,6 @@ foo {
   background: blue;
 }
 
-foo [disabled].baz {
+foo .baz[disabled] {
   background: blue;
 }
diff --git a/spec/libsass-todo-issues/issue_2055.hrx b/spec/libsass-closed-issues/issue_2055.hrx
similarity index 69%
rename from spec/libsass-todo-issues/issue_2055.hrx
rename to spec/libsass-closed-issues/issue_2055.hrx
index 1d96181b7f..e80ec2aa90 100644
--- a/spec/libsass-todo-issues/issue_2055.hrx
+++ b/spec/libsass-closed-issues/issue_2055.hrx
@@ -16,19 +16,6 @@
   color: red;
 }
 
-:not(.thing[disabled]):not([disabled]:not(.thing[disabled])):not([disabled]:has(:not(.thing[disabled]))) {
-  background: blue;
-}
-
-:has(:not(.thing[disabled]):not([disabled]:not(.thing[disabled])):not([disabled]:has(:not(.thing[disabled])))) {
-  background: blue;
-}
-
-<===> output-dart-sass.css
-:not(.thing) {
-  color: red;
-}
-
 :not(.thing[disabled]):not([disabled]:has(:not(.thing[disabled]):not([disabled]:not(.thing[disabled])))):not([disabled]:not(.thing[disabled]):not([disabled]:has(:not(.thing[disabled]):not([disabled]:not(.thing[disabled]))))) {
   background: blue;
 }
diff --git a/spec/libsass-todo-issues/issue_2175.hrx b/spec/libsass-closed-issues/issue_2175.hrx
similarity index 67%
rename from spec/libsass-todo-issues/issue_2175.hrx
rename to spec/libsass-closed-issues/issue_2175.hrx
index 7f3844efd9..d94532791a 100644
--- a/spec/libsass-todo-issues/issue_2175.hrx
+++ b/spec/libsass-closed-issues/issue_2175.hrx
@@ -8,6 +8,12 @@ Error: Invalid CSS after "a:nth-child(": expected An+B expression, was ")"
         on line 2 of input.scss
   Use --trace for backtrace.
 
+<===> error-libsass
+Error: Invalid CSS after "a:nth-child(": expected An+B expression, was ") {"
+        on line 1:3 of input.scss
+>> a:nth-child() {
+   --^
+
 <===> error-dart-sass
 Error: Expected "n".
   ,
diff --git a/spec/libsass-closed-issues/issue_2179.hrx b/spec/libsass-closed-issues/issue_2179.hrx
index 2eea5b02ad..b457d5b925 100644
--- a/spec/libsass-closed-issues/issue_2179.hrx
+++ b/spec/libsass-closed-issues/issue_2179.hrx
@@ -1,46 +1,41 @@
-<===> options.yml
----
-:todo:
-- dart-sass
-
 <===> input.scss
-@mixin sprite-arrow() {
-  @extend %hidden-text;
-}
-
-%hidden-text {
-  text-indent: -999em;
-}
-
-// button.scss
-.button-left,
-.button-right,
-.button-plus,
-.button-min {
-  &:after {
-      @include sprite-arrow();
-  }
-}
-
-.banner {
-  &:after {
-      @include sprite-arrow();
-  }
-}
-
-.calculator {
-  .btn-down,
-  .btn-up {
-      &:after {
-          @include sprite-arrow();
-      }
-  }
+@mixin sprite-arrow() {
+  @extend %hidden-text;
+}
+
+%hidden-text {
+  text-indent: -999em;
+}
+
+// button.scss
+.button-left,
+.button-right,
+.button-plus,
+.button-min {
+  &:after {
+      @include sprite-arrow();
+  }
+}
+
+.banner {
+  &:after {
+      @include sprite-arrow();
+  }
+}
+
+.calculator {
+  .btn-down,
+  .btn-up {
+      &:after {
+          @include sprite-arrow();
+      }
+  }
 }
 <===> output.css
-.button-left:after,
+.calculator .btn-down:after,
+.calculator .btn-up:after, .banner:after, .button-left:after,
 .button-right:after,
 .button-plus:after,
-.button-min:after, .banner:after, .calculator .btn-down:after,
-.calculator .btn-up:after {
+.button-min:after {
   text-indent: -999em;
 }
diff --git a/spec/libsass-closed-issues/issue_2260/no-parent-with-compound.hrx b/spec/libsass-closed-issues/issue_2260/no-parent-with-compound.hrx
index 9c61da7c6c..ba7f7f124e 100644
--- a/spec/libsass-closed-issues/issue_2260/no-parent-with-compound.hrx
+++ b/spec/libsass-closed-issues/issue_2260/no-parent-with-compound.hrx
@@ -1,15 +1,16 @@
 <===> input.scss
-@mixin test() {
-  @at-root {
-    @content;
-  }
-}
-
-@include test {
-  .test & {
-    property: value;
-   }
- }
+@mixin test() {
+  @at-root {
+    @content;
+  }
+}
+
+@include test {
+  .test & {
+    property: value;
+   }
+}
+
 <===> error
 Error: Base-level rules cannot contain the parent-selector-referencing character '&'.
         on line 8 of input.scss, in `@content'
@@ -17,6 +18,13 @@ Error: Base-level rules cannot contain the parent-selector-referencing character
         from line 7 of input.scss
   Use --trace for backtrace.
 
+<===> error-libsass
+Error: Top-level selectors may not contain the parent selector "&".
+        on line 3:7 of input.scss, in mixin `test`
+        from line 7:12 of input.scss
+>>     .test & {
+   ----^
+
 <===> error-dart-sass
 Error: Top-level selectors may not contain the parent selector "&".
   ,
diff --git a/spec/libsass-closed-issues/issue_2304.hrx b/spec/libsass-closed-issues/issue_2304.hrx
index 0ecc91a1f4..2e51e15a61 100644
--- a/spec/libsass-closed-issues/issue_2304.hrx
+++ b/spec/libsass-closed-issues/issue_2304.hrx
@@ -1,10 +1,10 @@
 <===> _module.scss
-.foo, & {
-  background: red;
-}
-
-.foo, &:before {
-  background: red;
+.foo, & {
+  background: red;
+}
+
+.foo, &:before {
+  background: red;
 }
 <===> input.scss
 @import "module";
@@ -14,6 +14,12 @@ Error: Base-level rules cannot contain the parent-selector-referencing character
         from line 1 of input.scss
   Use --trace for backtrace.
 
+<===> error-libsass
+Error: Top-level selectors may not contain the parent selector "&".
+        on line 1:9 of input.scss
+>> .foo, & {
+   ------^
+
 <===> error-dart-sass
 Error: Top-level selectors may not contain the parent selector "&".
   ,
diff --git a/spec/libsass-todo-issues/issue_245443/error b/spec/libsass-closed-issues/issue_245443/error
similarity index 100%
rename from spec/libsass-todo-issues/issue_245443/error
rename to spec/libsass-closed-issues/issue_245443/error
diff --git a/spec/libsass-todo-issues/issue_245443/error-dart-sass b/spec/libsass-closed-issues/issue_245443/error-dart-sass
similarity index 100%
rename from spec/libsass-todo-issues/issue_245443/error-dart-sass
rename to spec/libsass-closed-issues/issue_245443/error-dart-sass
diff --git a/spec/libsass-closed-issues/issue_245443/error-libsass b/spec/libsass-closed-issues/issue_245443/error-libsass
new file mode 100644
index 0000000000..21e8ff59c4
--- /dev/null
+++ b/spec/libsass-closed-issues/issue_245443/error-libsass
@@ -0,0 +1,3 @@
+Error: Invalid UTF-8 sequence
+        on line 1:5 of input.scss
+>> @mfu\x{fffd}n pue0\x{fffd}\x{fffd}\x{fffd}\x{fffd} {\x{fffd}.\|,&
diff --git a/spec/libsass-todo-issues/issue_245443/input.scss b/spec/libsass-closed-issues/issue_245443/input.scss
similarity index 100%
rename from spec/libsass-todo-issues/issue_245443/input.scss
rename to spec/libsass-closed-issues/issue_245443/input.scss
diff --git a/spec/libsass-closed-issues/issue_2468.hrx b/spec/libsass-closed-issues/issue_2468.hrx
index d785972d46..1e44439bb3 100644
--- a/spec/libsass-closed-issues/issue_2468.hrx
+++ b/spec/libsass-closed-issues/issue_2468.hrx
@@ -1,38 +1,27 @@
 <===> input.scss
-%matches {
-  :matches(oh, no) {
-      x: 1;
-      y: 2;
-  }
-}
-matches {
-  @extend %matches;
-  @extend oh;
-}
-
-%any {
-  :any(oh, no) {
-      x: 1;
-      y: 2;
-  }
-}
-any {
-  @extend %any;
-  @extend oh;
-}
-
-<===> output.css
-matches :matches(oh, matches, any, no) {
-  x: 1;
-  y: 2;
+%matches {
+  :matches(oh, no) {
+      x: 1;
+      y: 2;
+  }
+}
+matches {
+  @extend %matches;
+  @extend oh;
 }
 
-any :any(oh, matches, any, no) {
-  x: 1;
-  y: 2;
+%any {
+  :any(oh, no) {
+      x: 1;
+      y: 2;
+  }
+}
+any {
+  @extend %any;
+  @extend oh;
 }
 
-<===> output-dart-sass.css
+<===> output.css
 matches :matches(oh, any, matches, no) {
   x: 1;
   y: 2;
diff --git a/spec/libsass-closed-issues/issue_2482.hrx b/spec/libsass-closed-issues/issue_2482.hrx
index b9029af80a..a709758e06 100644
--- a/spec/libsass-closed-issues/issue_2482.hrx
+++ b/spec/libsass-closed-issues/issue_2482.hrx
@@ -1,20 +1,30 @@
-<===> options.yml
----
-:todo:
-- dart-sass
-
 <===> input.scss
-@mixin mixin()
-{
-	& .class
-	{
-		color: black;
-	}
-}
-
+@mixin mixin()
+{
+	& .class
+	{
+		color: black;
+	}
+}
+
 @include mixin();
 <===> error
 Error: Base-level rules cannot contain the parent-selector-referencing character '&'.
         on line 3 of input.scss, in `mixin'
         from line 9 of input.scss
   Use --trace for backtrace.
+
+<===> error-libsass
+Error: Top-level selectors may not contain the parent selector "&".
+        on line 9:10 of input.scss
+>>      & .class
+
+<===> error-dart-sass
+Error: Top-level selectors may not contain the parent selector "&".
+  ,
+3 | /     & .class
+4 | |     {
+  | '----^
+  '
+  input.scss 3:2  mixin()
+  input.scss 9:1  root stylesheet
diff --git a/spec/libsass-closed-issues/issue_2604.hrx b/spec/libsass-closed-issues/issue_2604.hrx
deleted file mode 100644
index 78d7e39413..0000000000
--- a/spec/libsass-closed-issues/issue_2604.hrx
+++ /dev/null
@@ -1,38 +0,0 @@
-<===> input.scss
-test {
-  border-top-color: darken(lighten(desaturate(#ffffff, 15.7%), 33.5%), 14.625%);
-  border-top-color: darken(lighten(desaturate(#fefefe, 15.7%), 33.5%), 14.625%);
-  border-top-color: darken(lighten(desaturate(#fdfdfd, 15.7%), 33.5%), 14.625%);
-  border-top-color: darken(lighten(desaturate(#fcfcfc, 15.7%), 33.5%), 14.625%);
-  border-top-color: darken(lighten(desaturate(#fbfbfb, 15.7%), 33.5%), 14.625%);
-  border-top-color: darken(lighten(desaturate(#fafafa, 15.7%), 33.5%), 14.625%);
-  border-top-color: darken(lighten(desaturate(#f9f9f9, 15.7%), 33.5%), 14.625%);
-  border-top-color: darken(lighten(desaturate(#f8f8f8, 15.7%), 33.5%), 14.625%);
-  border-top-color: darken(lighten(desaturate(#f7f7f7, 15.7%), 33.5%), 14.625%);
-  border-top-color: darken(lighten(desaturate(#f6f6f6, 15.7%), 33.5%), 14.625%);
-  border-top-color: darken(lighten(desaturate(#f5f5f5, 15.7%), 33.5%), 14.625%);
-  border-top-color: darken(lighten(desaturate(#f4f4f4, 15.7%), 33.5%), 14.625%);
-  border-top-color: darken(lighten(desaturate(#f3f3f3, 15.7%), 33.5%), 14.625%);
-  border-top-color: darken(lighten(desaturate(#f2f2f2, 15.7%), 33.5%), 14.625%);
-  border-top-color: darken(lighten(desaturate(#f1f1f1, 15.7%), 33.5%), 14.625%);
-  border-top-color: darken(lighten(desaturate(#f0f0f0, 15.7%), 33.5%), 14.625%);
-}
-<===> output.css
-test {
-  border-top-color: #dadada;
-  border-top-color: #dadada;
-  border-top-color: #dadada;
-  border-top-color: #dadada;
-  border-top-color: #dadada;
-  border-top-color: #dadada;
-  border-top-color: #dadada;
-  border-top-color: #dadada;
-  border-top-color: #dadada;
-  border-top-color: #dadada;
-  border-top-color: #dadada;
-  border-top-color: #dadada;
-  border-top-color: #dadada;
-  border-top-color: #dadada;
-  border-top-color: #dadada;
-  border-top-color: #dadada;
-}
diff --git a/spec/libsass-closed-issues/issue_592.hrx b/spec/libsass-closed-issues/issue_592.hrx
index 8f32e6f3ed..86f1c06888 100644
--- a/spec/libsass-closed-issues/issue_592.hrx
+++ b/spec/libsass-closed-issues/issue_592.hrx
@@ -14,11 +14,6 @@
 }
 
 <===> output.css
-.a .b::-webkit-scrollbar, .a .c .b::-webkit-scrollbar {
-  color: green;
-}
-
-<===> output-dart-sass.css
 .a .c .b::-webkit-scrollbar, .a .b::-webkit-scrollbar {
   color: green;
 }
diff --git a/spec/libsass-closed-issues/issue_593.hrx b/spec/libsass-closed-issues/issue_593.hrx
index 16f84260db..4be1b43c02 100644
--- a/spec/libsass-closed-issues/issue_593.hrx
+++ b/spec/libsass-closed-issues/issue_593.hrx
@@ -15,12 +15,3 @@ h1:nth-of-type(2n + 1) {
 h1:nth-of-type(2n + 1) {
   color: red;
 }
-
-<===> output-libsass.css
-h1:nth-of-type(2n + 1) {
-  color: red;
-}
-
-h1:nth-of-type(2n   +  1) {
-  color: red;
-}
diff --git a/spec/libsass-closed-issues/issue_602/options.yml b/spec/libsass-closed-issues/issue_602/options.yml
index 3bb0723bb6..8380261167 100644
--- a/spec/libsass-closed-issues/issue_602/options.yml
+++ b/spec/libsass-closed-issues/issue_602/options.yml
@@ -1,3 +1,3 @@
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
diff --git a/spec/libsass-closed-issues/issue_673.hrx b/spec/libsass-closed-issues/issue_673.hrx
index 8a26e0a9cc..ecf931931c 100644
--- a/spec/libsass-closed-issues/issue_673.hrx
+++ b/spec/libsass-closed-issues/issue_673.hrx
@@ -1,22 +1,29 @@
 <===> input.scss
-.example {
-    padding-left: 2rem;
-    padding-right: 2rem;
-}
-@media screen and (min-width:768px) {
-
-    #footer {
-        .row {
-            @extend .example;
-        }
-    }
-
+.example {
+    padding-left: 2rem;
+    padding-right: 2rem;
+}
+@media screen and (min-width:768px) {
+
+    #footer {
+        .row {
+            @extend .example;
+        }
+    }
+
 }
 <===> error
 Error: You may not @extend an outer selector from within @media.
        You may only @extend selectors within the same directive.
        From "@extend .example" on line 9 of input.scss.
 
+<===> error-libsass
+Error: You may not @extend selectors across media queries.
+       Use "@extend .example !optional" to avoid this error.
+        on line 9 of input.scss
+>>             @extend .example;
+   --------------------^
+
 <===> error-dart-sass
 Error: From line 1, column 1 of input.scss: 
   ,
diff --git a/spec/libsass-todo-issues/issue_690.hrx b/spec/libsass-closed-issues/issue_690.hrx
similarity index 61%
rename from spec/libsass-todo-issues/issue_690.hrx
rename to spec/libsass-closed-issues/issue_690.hrx
index 09df85a9c7..fad5ed2da5 100644
--- a/spec/libsass-todo-issues/issue_690.hrx
+++ b/spec/libsass-closed-issues/issue_690.hrx
@@ -1,13 +1,10 @@
 <===> input.scss
-test {
-  left: expression(callSomeFunc());
-  content: expression("Smile :-)");
-}
-
-<===> error
-Error: Invalid CSS after "...sion("Smile :-)": expected ";", was "");"
+test {
+  left: expression(callSomeFunc());
+  content: expression("Smile :-)");
+}
 
-<===> output-dart-sass.css
+<===> output.css
 test {
   left: expression(callSomeFunc());
   content: expression("Smile :-)");
diff --git a/spec/libsass-closed-issues/issue_712.hrx b/spec/libsass-closed-issues/issue_712.hrx
index dbe1eedf94..fdadb05a17 100644
--- a/spec/libsass-closed-issues/issue_712.hrx
+++ b/spec/libsass-closed-issues/issue_712.hrx
@@ -16,6 +16,13 @@ Error: You may not @extend an outer selector from within @media.
         on line 1 of input.scss
   Use --trace for backtrace.
 
+<===> error-libsass
+Error: You may not @extend selectors across media queries.
+       Use "@extend .foo !optional" to avoid this error.
+        on line 7 of input.scss
+>>       @extend .foo;
+   --------------^
+
 <===> error-dart-sass
 Error: From line 1, column 1 of input.scss: 
   ,
diff --git a/spec/libsass-closed-issues/issue_759.hrx b/spec/libsass-closed-issues/issue_759.hrx
index aa2901b88b..cdf555048c 100644
--- a/spec/libsass-closed-issues/issue_759.hrx
+++ b/spec/libsass-closed-issues/issue_759.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :warning_todo:
-- libsass # sass/libsass#2834
+- sass/libsass#2834
 
 <===> input.scss
 $a: 10px !global !default;
diff --git a/spec/libsass-closed-issues/issue_823.hrx b/spec/libsass-closed-issues/issue_823.hrx
index c8400a0aff..8f0d29690c 100644
--- a/spec/libsass-closed-issues/issue_823.hrx
+++ b/spec/libsass-closed-issues/issue_823.hrx
@@ -18,11 +18,6 @@ p {
 }
 
 <===> output.css
-p > .red, p > a > .red {
-  color: #F00;
-}
-
-<===> output-dart-sass.css
 p > a > .red, p > .red {
   color: #F00;
 }
diff --git a/spec/libsass-closed-issues/issue_871.hrx b/spec/libsass-closed-issues/issue_871.hrx
index bb4f7c5a15..c93bd3dc2f 100644
--- a/spec/libsass-closed-issues/issue_871.hrx
+++ b/spec/libsass-closed-issues/issue_871.hrx
@@ -10,6 +10,13 @@ Error: ".bar" failed to @extend ".foo".
         on line 2 of input.scss
   Use --trace for backtrace.
 
+<===> error-libsass
+Error: The target selector was not found.
+       Use "@extend .foo !optional" to avoid this error.
+        on line 2 of input.scss
+>>   @extend .foo;
+   ----------^
+
 <===> error-dart-sass
 Error: The target selector was not found.
 Use "@extend .foo !optional" to avoid this error.
diff --git a/spec/libsass-todo-issues/issue_963/selector-functions/is_superselector/_assert_helpers.scss b/spec/libsass-todo-issues/issue_963/selector-functions/is_superselector/_assert_helpers.scss
deleted file mode 100644
index 37a9946776..0000000000
--- a/spec/libsass-todo-issues/issue_963/selector-functions/is_superselector/_assert_helpers.scss
+++ /dev/null
@@ -1,8 +0,0 @@
-// Makes sure that a 'is-superselector' call is not true, when the parameters are reversed
-@function assert_strict_superselector($a, $b) {
-  @return is_superselector($a, $b) and not is_superselector($b, $a);
-}
-
-@function refute_superselector($a, $b) {
-  @return not is_superselector($a, $b);
-}
diff --git a/spec/libsass/base-level-parent/imported/at-root-alone.hrx b/spec/libsass/base-level-parent/imported/at-root-alone.hrx
index b90efd4f62..fed6984f9c 100644
--- a/spec/libsass/base-level-parent/imported/at-root-alone.hrx
+++ b/spec/libsass/base-level-parent/imported/at-root-alone.hrx
@@ -1,10 +1,10 @@
 <===> include.scss
-@at-root {
-  & {
-    foo {
-      bar: baz;
-    }
-  }
+@at-root {
+  & {
+    foo {
+      bar: baz;
+    }
+  }
 }
 <===> input.scss
 @import "include.scss";
@@ -14,6 +14,12 @@ Error: Base-level rules cannot contain the parent-selector-referencing character
         from line 1 of input.scss
   Use --trace for backtrace.
 
+<===> error-libsass
+Error: Top-level selectors may not contain the parent selector "&".
+        on line 1:9 of input.scss
+>>   & {
+   --^
+
 <===> error-dart-sass
 Error: Top-level selectors may not contain the parent selector "&".
   ,
diff --git a/spec/libsass/base-level-parent/imported/at-root-postfix.hrx b/spec/libsass/base-level-parent/imported/at-root-postfix.hrx
index f133c869ab..e5d12abf4d 100644
--- a/spec/libsass/base-level-parent/imported/at-root-postfix.hrx
+++ b/spec/libsass/base-level-parent/imported/at-root-postfix.hrx
@@ -1,10 +1,10 @@
 <===> include.scss
-@at-root {
-  &post {
-    foo {
-      bar: baz;
-    }
-  }
+@at-root {
+  &post {
+    foo {
+      bar: baz;
+    }
+  }
 }
 <===> input.scss
 @import "include.scss";
@@ -14,6 +14,12 @@ Error: Base-level rules cannot contain the parent-selector-referencing character
         from line 1 of input.scss
   Use --trace for backtrace.
 
+<===> error-libsass
+Error: Top-level selectors may not contain the parent selector "&".
+        on line 1:9 of input.scss
+>>   &post {
+   --^
+
 <===> error-dart-sass
 Error: Top-level selectors may not contain the parent selector "&".
   ,
diff --git a/spec/libsass/base-level-parent/imported/basic-alone.hrx b/spec/libsass/base-level-parent/imported/basic-alone.hrx
index db9ac22c09..a13f0aadb0 100644
--- a/spec/libsass/base-level-parent/imported/basic-alone.hrx
+++ b/spec/libsass/base-level-parent/imported/basic-alone.hrx
@@ -1,9 +1,9 @@
 <===> include.scss
-& {
-  foo {
-    bar: baz;
-  }
-}
+& {
+  foo {
+    bar: baz;
+  }
+}
 
 <===> input.scss
 @import "include.scss";
@@ -13,6 +13,11 @@ Error: Base-level rules cannot contain the parent-selector-referencing character
         from line 1 of input.scss
   Use --trace for backtrace.
 
+<===> error-libsass
+Error: Top-level selectors may not contain the parent selector "&".
+        on line 1:9 of input.scss
+>> & {
+
 <===> error-dart-sass
 Error: Top-level selectors may not contain the parent selector "&".
   ,
diff --git a/spec/libsass/base-level-parent/imported/basic-postfix.hrx b/spec/libsass/base-level-parent/imported/basic-postfix.hrx
index 89013b9380..78c9b99fd2 100644
--- a/spec/libsass/base-level-parent/imported/basic-postfix.hrx
+++ b/spec/libsass/base-level-parent/imported/basic-postfix.hrx
@@ -1,8 +1,8 @@
 <===> include.scss
-&post {
-  foo {
-    bar: baz;
-  }
+&post {
+  foo {
+    bar: baz;
+  }
 }
 <===> input.scss
 @import "include.scss";
@@ -12,6 +12,11 @@ Error: Base-level rules cannot contain the parent-selector-referencing character
         from line 1 of input.scss
   Use --trace for backtrace.
 
+<===> error-libsass
+Error: Top-level selectors may not contain the parent selector "&".
+        on line 1:9 of input.scss
+>> &post {
+
 <===> error-dart-sass
 Error: Top-level selectors may not contain the parent selector "&".
   ,
diff --git a/spec/libsass/base-level-parent/root/at-root-alone.hrx b/spec/libsass/base-level-parent/root/at-root-alone.hrx
index f35aa24508..fa81b4a39e 100644
--- a/spec/libsass/base-level-parent/root/at-root-alone.hrx
+++ b/spec/libsass/base-level-parent/root/at-root-alone.hrx
@@ -1,16 +1,22 @@
 <===> input.scss
-@at-root {
-  & {
-    foo {
-      bar: baz;
-    }
-  }
+@at-root {
+  & {
+    foo {
+      bar: baz;
+    }
+  }
 }
 <===> error
 Error: Base-level rules cannot contain the parent-selector-referencing character '&'.
         on line 2 of input.scss
   Use --trace for backtrace.
 
+<===> error-libsass
+Error: Top-level selectors may not contain the parent selector "&".
+        on line 2 of input.scss
+>>     & {
+   ----^
+
 <===> error-dart-sass
 Error: Top-level selectors may not contain the parent selector "&".
   ,
diff --git a/spec/libsass/base-level-parent/root/at-root-postfix.hrx b/spec/libsass/base-level-parent/root/at-root-postfix.hrx
index f4c56dae1d..248a8fd59d 100644
--- a/spec/libsass/base-level-parent/root/at-root-postfix.hrx
+++ b/spec/libsass/base-level-parent/root/at-root-postfix.hrx
@@ -1,16 +1,22 @@
 <===> input.scss
-@at-root {
-  &post {
-    foo {
-      bar: baz;
-    }
-  }
+@at-root {
+  &post {
+    foo {
+      bar: baz;
+    }
+  }
 }
 <===> error
 Error: Base-level rules cannot contain the parent-selector-referencing character '&'.
         on line 2 of input.scss
   Use --trace for backtrace.
 
+<===> error-libsass
+Error: Top-level selectors may not contain the parent selector "&".
+        on line 2 of input.scss
+>>     &post {
+   ----^
+
 <===> error-dart-sass
 Error: Top-level selectors may not contain the parent selector "&".
   ,
diff --git a/spec/libsass/base-level-parent/root/basic-alone.hrx b/spec/libsass/base-level-parent/root/basic-alone.hrx
index ef3dfe1e2f..0586e54e6a 100644
--- a/spec/libsass/base-level-parent/root/basic-alone.hrx
+++ b/spec/libsass/base-level-parent/root/basic-alone.hrx
@@ -1,15 +1,20 @@
 <===> input.scss
-& {
-  foo {
-    bar: baz;
-  }
-}
+& {
+  foo {
+    bar: baz;
+  }
+}
 
 <===> error
 Error: Base-level rules cannot contain the parent-selector-referencing character '&'.
         on line 1 of input.scss
   Use --trace for backtrace.
 
+<===> error-libsass
+Error: Top-level selectors may not contain the parent selector "&".
+        on line 1 of input.scss
+>> & {
+
 <===> error-dart-sass
 Error: Top-level selectors may not contain the parent selector "&".
   ,
diff --git a/spec/libsass/base-level-parent/root/basic-postfix.hrx b/spec/libsass/base-level-parent/root/basic-postfix.hrx
index cfb492cf2c..7ecb26878f 100644
--- a/spec/libsass/base-level-parent/root/basic-postfix.hrx
+++ b/spec/libsass/base-level-parent/root/basic-postfix.hrx
@@ -1,14 +1,19 @@
 <===> input.scss
-&post {
-  foo {
-    bar: baz;
-  }
+&post {
+  foo {
+    bar: baz;
+  }
 }
 <===> error
 Error: Base-level rules cannot contain the parent-selector-referencing character '&'.
         on line 1 of input.scss
   Use --trace for backtrace.
 
+<===> error-libsass
+Error: Top-level selectors may not contain the parent selector "&".
+        on line 1 of input.scss
+>> &post {
+
 <===> error-dart-sass
 Error: Top-level selectors may not contain the parent selector "&".
   ,
diff --git a/spec/libsass/color-functions/hsl/adjust-hue.hrx b/spec/libsass/color-functions/hsl/adjust-hue.hrx
deleted file mode 100644
index 95926279f4..0000000000
--- a/spec/libsass/color-functions/hsl/adjust-hue.hrx
+++ /dev/null
@@ -1,1453 +0,0 @@
-<===> input.scss
-foo {
-  c-361: adjust-hue(rgb(0,0,0), -361);
-  c-360: adjust-hue(rgb(0,0,0), -360);
-  c-359: adjust-hue(rgb(0,0,0), -359);
-  c-358: adjust-hue(rgb(0,0,0), -358);
-  c-357: adjust-hue(rgb(0,0,0), -357);
-  c-356: adjust-hue(rgb(0,0,0), -356);
-  c-355: adjust-hue(rgb(0,0,0), -355);
-  c-354: adjust-hue(rgb(0,0,0), -354);
-  c-353: adjust-hue(rgb(0,0,0), -353);
-  c-352: adjust-hue(rgb(0,0,0), -352);
-  c-351: adjust-hue(rgb(0,0,0), -351);
-  c-350: adjust-hue(rgb(0,0,0), -350);
-  c-349: adjust-hue(rgb(0,0,0), -349);
-  c-348: adjust-hue(rgb(0,0,0), -348);
-  c-347: adjust-hue(rgb(0,0,0), -347);
-  c-346: adjust-hue(rgb(0,0,0), -346);
-  c-345: adjust-hue(rgb(0,0,0), -345);
-  c-344: adjust-hue(rgb(0,0,0), -344);
-  c-343: adjust-hue(rgb(0,0,0), -343);
-  c-342: adjust-hue(rgb(0,0,0), -342);
-  c-341: adjust-hue(rgb(0,0,0), -341);
-  c-340: adjust-hue(rgb(0,0,0), -340);
-  c-339: adjust-hue(rgb(0,0,0), -339);
-  c-338: adjust-hue(rgb(0,0,0), -338);
-  c-337: adjust-hue(rgb(0,0,0), -337);
-  c-336: adjust-hue(rgb(0,0,0), -336);
-  c-335: adjust-hue(rgb(0,0,0), -335);
-  c-334: adjust-hue(rgb(0,0,0), -334);
-  c-333: adjust-hue(rgb(0,0,0), -333);
-  c-332: adjust-hue(rgb(0,0,0), -332);
-  c-331: adjust-hue(rgb(0,0,0), -331);
-  c-330: adjust-hue(rgb(0,0,0), -330);
-  c-329: adjust-hue(rgb(0,0,0), -329);
-  c-328: adjust-hue(rgb(0,0,0), -328);
-  c-327: adjust-hue(rgb(0,0,0), -327);
-  c-326: adjust-hue(rgb(0,0,0), -326);
-  c-325: adjust-hue(rgb(0,0,0), -325);
-  c-324: adjust-hue(rgb(0,0,0), -324);
-  c-323: adjust-hue(rgb(0,0,0), -323);
-  c-322: adjust-hue(rgb(0,0,0), -322);
-  c-321: adjust-hue(rgb(0,0,0), -321);
-  c-320: adjust-hue(rgb(0,0,0), -320);
-  c-319: adjust-hue(rgb(0,0,0), -319);
-  c-318: adjust-hue(rgb(0,0,0), -318);
-  c-317: adjust-hue(rgb(0,0,0), -317);
-  c-316: adjust-hue(rgb(0,0,0), -316);
-  c-315: adjust-hue(rgb(0,0,0), -315);
-  c-314: adjust-hue(rgb(0,0,0), -314);
-  c-313: adjust-hue(rgb(0,0,0), -313);
-  c-312: adjust-hue(rgb(0,0,0), -312);
-  c-311: adjust-hue(rgb(0,0,0), -311);
-  c-310: adjust-hue(rgb(0,0,0), -310);
-  c-309: adjust-hue(rgb(0,0,0), -309);
-  c-308: adjust-hue(rgb(0,0,0), -308);
-  c-307: adjust-hue(rgb(0,0,0), -307);
-  c-306: adjust-hue(rgb(0,0,0), -306);
-  c-305: adjust-hue(rgb(0,0,0), -305);
-  c-304: adjust-hue(rgb(0,0,0), -304);
-  c-303: adjust-hue(rgb(0,0,0), -303);
-  c-302: adjust-hue(rgb(0,0,0), -302);
-  c-301: adjust-hue(rgb(0,0,0), -301);
-  c-300: adjust-hue(rgb(0,0,0), -300);
-  c-299: adjust-hue(rgb(0,0,0), -299);
-  c-298: adjust-hue(rgb(0,0,0), -298);
-  c-297: adjust-hue(rgb(0,0,0), -297);
-  c-296: adjust-hue(rgb(0,0,0), -296);
-  c-295: adjust-hue(rgb(0,0,0), -295);
-  c-294: adjust-hue(rgb(0,0,0), -294);
-  c-293: adjust-hue(rgb(0,0,0), -293);
-  c-292: adjust-hue(rgb(0,0,0), -292);
-  c-291: adjust-hue(rgb(0,0,0), -291);
-  c-290: adjust-hue(rgb(0,0,0), -290);
-  c-289: adjust-hue(rgb(0,0,0), -289);
-  c-288: adjust-hue(rgb(0,0,0), -288);
-  c-287: adjust-hue(rgb(0,0,0), -287);
-  c-286: adjust-hue(rgb(0,0,0), -286);
-  c-285: adjust-hue(rgb(0,0,0), -285);
-  c-284: adjust-hue(rgb(0,0,0), -284);
-  c-283: adjust-hue(rgb(0,0,0), -283);
-  c-282: adjust-hue(rgb(0,0,0), -282);
-  c-281: adjust-hue(rgb(0,0,0), -281);
-  c-280: adjust-hue(rgb(0,0,0), -280);
-  c-279: adjust-hue(rgb(0,0,0), -279);
-  c-278: adjust-hue(rgb(0,0,0), -278);
-  c-277: adjust-hue(rgb(0,0,0), -277);
-  c-276: adjust-hue(rgb(0,0,0), -276);
-  c-275: adjust-hue(rgb(0,0,0), -275);
-  c-274: adjust-hue(rgb(0,0,0), -274);
-  c-273: adjust-hue(rgb(0,0,0), -273);
-  c-272: adjust-hue(rgb(0,0,0), -272);
-  c-271: adjust-hue(rgb(0,0,0), -271);
-  c-270: adjust-hue(rgb(0,0,0), -270);
-  c-269: adjust-hue(rgb(0,0,0), -269);
-  c-268: adjust-hue(rgb(0,0,0), -268);
-  c-267: adjust-hue(rgb(0,0,0), -267);
-  c-266: adjust-hue(rgb(0,0,0), -266);
-  c-265: adjust-hue(rgb(0,0,0), -265);
-  c-264: adjust-hue(rgb(0,0,0), -264);
-  c-263: adjust-hue(rgb(0,0,0), -263);
-  c-262: adjust-hue(rgb(0,0,0), -262);
-  c-261: adjust-hue(rgb(0,0,0), -261);
-  c-260: adjust-hue(rgb(0,0,0), -260);
-  c-259: adjust-hue(rgb(0,0,0), -259);
-  c-258: adjust-hue(rgb(0,0,0), -258);
-  c-257: adjust-hue(rgb(0,0,0), -257);
-  c-256: adjust-hue(rgb(0,0,0), -256);
-  c-255: adjust-hue(rgb(0,0,0), -255);
-  c-254: adjust-hue(rgb(0,0,0), -254);
-  c-253: adjust-hue(rgb(0,0,0), -253);
-  c-252: adjust-hue(rgb(0,0,0), -252);
-  c-251: adjust-hue(rgb(0,0,0), -251);
-  c-250: adjust-hue(rgb(0,0,0), -250);
-  c-249: adjust-hue(rgb(0,0,0), -249);
-  c-248: adjust-hue(rgb(0,0,0), -248);
-  c-247: adjust-hue(rgb(0,0,0), -247);
-  c-246: adjust-hue(rgb(0,0,0), -246);
-  c-245: adjust-hue(rgb(0,0,0), -245);
-  c-244: adjust-hue(rgb(0,0,0), -244);
-  c-243: adjust-hue(rgb(0,0,0), -243);
-  c-242: adjust-hue(rgb(0,0,0), -242);
-  c-241: adjust-hue(rgb(0,0,0), -241);
-  c-240: adjust-hue(rgb(0,0,0), -240);
-  c-239: adjust-hue(rgb(0,0,0), -239);
-  c-238: adjust-hue(rgb(0,0,0), -238);
-  c-237: adjust-hue(rgb(0,0,0), -237);
-  c-236: adjust-hue(rgb(0,0,0), -236);
-  c-235: adjust-hue(rgb(0,0,0), -235);
-  c-234: adjust-hue(rgb(0,0,0), -234);
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-  c113: adjust-hue(rgb(0,0,0), 113);
-  c114: adjust-hue(rgb(0,0,0), 114);
-  c115: adjust-hue(rgb(0,0,0), 115);
-  c116: adjust-hue(rgb(0,0,0), 116);
-  c117: adjust-hue(rgb(0,0,0), 117);
-  c118: adjust-hue(rgb(0,0,0), 118);
-  c119: adjust-hue(rgb(0,0,0), 119);
-  c120: adjust-hue(rgb(0,0,0), 120);
-  c121: adjust-hue(rgb(0,0,0), 121);
-  c122: adjust-hue(rgb(0,0,0), 122);
-  c123: adjust-hue(rgb(0,0,0), 123);
-  c124: adjust-hue(rgb(0,0,0), 124);
-  c125: adjust-hue(rgb(0,0,0), 125);
-  c126: adjust-hue(rgb(0,0,0), 126);
-  c127: adjust-hue(rgb(0,0,0), 127);
-  c128: adjust-hue(rgb(0,0,0), 128);
-  c129: adjust-hue(rgb(0,0,0), 129);
-  c130: adjust-hue(rgb(0,0,0), 130);
-  c131: adjust-hue(rgb(0,0,0), 131);
-  c132: adjust-hue(rgb(0,0,0), 132);
-  c133: adjust-hue(rgb(0,0,0), 133);
-  c134: adjust-hue(rgb(0,0,0), 134);
-  c135: adjust-hue(rgb(0,0,0), 135);
-  c136: adjust-hue(rgb(0,0,0), 136);
-  c137: adjust-hue(rgb(0,0,0), 137);
-  c138: adjust-hue(rgb(0,0,0), 138);
-  c139: adjust-hue(rgb(0,0,0), 139);
-  c140: adjust-hue(rgb(0,0,0), 140);
-  c141: adjust-hue(rgb(0,0,0), 141);
-  c142: adjust-hue(rgb(0,0,0), 142);
-  c143: adjust-hue(rgb(0,0,0), 143);
-  c144: adjust-hue(rgb(0,0,0), 144);
-  c145: adjust-hue(rgb(0,0,0), 145);
-  c146: adjust-hue(rgb(0,0,0), 146);
-  c147: adjust-hue(rgb(0,0,0), 147);
-  c148: adjust-hue(rgb(0,0,0), 148);
-  c149: adjust-hue(rgb(0,0,0), 149);
-  c150: adjust-hue(rgb(0,0,0), 150);
-  c151: adjust-hue(rgb(0,0,0), 151);
-  c152: adjust-hue(rgb(0,0,0), 152);
-  c153: adjust-hue(rgb(0,0,0), 153);
-  c154: adjust-hue(rgb(0,0,0), 154);
-  c155: adjust-hue(rgb(0,0,0), 155);
-  c156: adjust-hue(rgb(0,0,0), 156);
-  c157: adjust-hue(rgb(0,0,0), 157);
-  c158: adjust-hue(rgb(0,0,0), 158);
-  c159: adjust-hue(rgb(0,0,0), 159);
-  c160: adjust-hue(rgb(0,0,0), 160);
-  c161: adjust-hue(rgb(0,0,0), 161);
-  c162: adjust-hue(rgb(0,0,0), 162);
-  c163: adjust-hue(rgb(0,0,0), 163);
-  c164: adjust-hue(rgb(0,0,0), 164);
-  c165: adjust-hue(rgb(0,0,0), 165);
-  c166: adjust-hue(rgb(0,0,0), 166);
-  c167: adjust-hue(rgb(0,0,0), 167);
-  c168: adjust-hue(rgb(0,0,0), 168);
-  c169: adjust-hue(rgb(0,0,0), 169);
-  c170: adjust-hue(rgb(0,0,0), 170);
-  c171: adjust-hue(rgb(0,0,0), 171);
-  c172: adjust-hue(rgb(0,0,0), 172);
-  c173: adjust-hue(rgb(0,0,0), 173);
-  c174: adjust-hue(rgb(0,0,0), 174);
-  c175: adjust-hue(rgb(0,0,0), 175);
-  c176: adjust-hue(rgb(0,0,0), 176);
-  c177: adjust-hue(rgb(0,0,0), 177);
-  c178: adjust-hue(rgb(0,0,0), 178);
-  c179: adjust-hue(rgb(0,0,0), 179);
-  c180: adjust-hue(rgb(0,0,0), 180);
-  c181: adjust-hue(rgb(0,0,0), 181);
-  c182: adjust-hue(rgb(0,0,0), 182);
-  c183: adjust-hue(rgb(0,0,0), 183);
-  c184: adjust-hue(rgb(0,0,0), 184);
-  c185: adjust-hue(rgb(0,0,0), 185);
-  c186: adjust-hue(rgb(0,0,0), 186);
-  c187: adjust-hue(rgb(0,0,0), 187);
-  c188: adjust-hue(rgb(0,0,0), 188);
-  c189: adjust-hue(rgb(0,0,0), 189);
-  c190: adjust-hue(rgb(0,0,0), 190);
-  c191: adjust-hue(rgb(0,0,0), 191);
-  c192: adjust-hue(rgb(0,0,0), 192);
-  c193: adjust-hue(rgb(0,0,0), 193);
-  c194: adjust-hue(rgb(0,0,0), 194);
-  c195: adjust-hue(rgb(0,0,0), 195);
-  c196: adjust-hue(rgb(0,0,0), 196);
-  c197: adjust-hue(rgb(0,0,0), 197);
-  c198: adjust-hue(rgb(0,0,0), 198);
-  c199: adjust-hue(rgb(0,0,0), 199);
-  c200: adjust-hue(rgb(0,0,0), 200);
-  c201: adjust-hue(rgb(0,0,0), 201);
-  c202: adjust-hue(rgb(0,0,0), 202);
-  c203: adjust-hue(rgb(0,0,0), 203);
-  c204: adjust-hue(rgb(0,0,0), 204);
-  c205: adjust-hue(rgb(0,0,0), 205);
-  c206: adjust-hue(rgb(0,0,0), 206);
-  c207: adjust-hue(rgb(0,0,0), 207);
-  c208: adjust-hue(rgb(0,0,0), 208);
-  c209: adjust-hue(rgb(0,0,0), 209);
-  c210: adjust-hue(rgb(0,0,0), 210);
-  c211: adjust-hue(rgb(0,0,0), 211);
-  c212: adjust-hue(rgb(0,0,0), 212);
-  c213: adjust-hue(rgb(0,0,0), 213);
-  c214: adjust-hue(rgb(0,0,0), 214);
-  c215: adjust-hue(rgb(0,0,0), 215);
-  c216: adjust-hue(rgb(0,0,0), 216);
-  c217: adjust-hue(rgb(0,0,0), 217);
-  c218: adjust-hue(rgb(0,0,0), 218);
-  c219: adjust-hue(rgb(0,0,0), 219);
-  c220: adjust-hue(rgb(0,0,0), 220);
-  c221: adjust-hue(rgb(0,0,0), 221);
-  c222: adjust-hue(rgb(0,0,0), 222);
-  c223: adjust-hue(rgb(0,0,0), 223);
-  c224: adjust-hue(rgb(0,0,0), 224);
-  c225: adjust-hue(rgb(0,0,0), 225);
-  c226: adjust-hue(rgb(0,0,0), 226);
-  c227: adjust-hue(rgb(0,0,0), 227);
-  c228: adjust-hue(rgb(0,0,0), 228);
-  c229: adjust-hue(rgb(0,0,0), 229);
-  c230: adjust-hue(rgb(0,0,0), 230);
-  c231: adjust-hue(rgb(0,0,0), 231);
-  c232: adjust-hue(rgb(0,0,0), 232);
-  c233: adjust-hue(rgb(0,0,0), 233);
-  c234: adjust-hue(rgb(0,0,0), 234);
-  c235: adjust-hue(rgb(0,0,0), 235);
-  c236: adjust-hue(rgb(0,0,0), 236);
-  c237: adjust-hue(rgb(0,0,0), 237);
-  c238: adjust-hue(rgb(0,0,0), 238);
-  c239: adjust-hue(rgb(0,0,0), 239);
-  c240: adjust-hue(rgb(0,0,0), 240);
-  c241: adjust-hue(rgb(0,0,0), 241);
-  c242: adjust-hue(rgb(0,0,0), 242);
-  c243: adjust-hue(rgb(0,0,0), 243);
-  c244: adjust-hue(rgb(0,0,0), 244);
-  c245: adjust-hue(rgb(0,0,0), 245);
-  c246: adjust-hue(rgb(0,0,0), 246);
-  c247: adjust-hue(rgb(0,0,0), 247);
-  c248: adjust-hue(rgb(0,0,0), 248);
-  c249: adjust-hue(rgb(0,0,0), 249);
-  c250: adjust-hue(rgb(0,0,0), 250);
-  c251: adjust-hue(rgb(0,0,0), 251);
-  c252: adjust-hue(rgb(0,0,0), 252);
-  c253: adjust-hue(rgb(0,0,0), 253);
-  c254: adjust-hue(rgb(0,0,0), 254);
-  c255: adjust-hue(rgb(0,0,0), 255);
-  c256: adjust-hue(rgb(0,0,0), 256);
-  c257: adjust-hue(rgb(0,0,0), 257);
-  c258: adjust-hue(rgb(0,0,0), 258);
-  c259: adjust-hue(rgb(0,0,0), 259);
-  c260: adjust-hue(rgb(0,0,0), 260);
-  c261: adjust-hue(rgb(0,0,0), 261);
-  c262: adjust-hue(rgb(0,0,0), 262);
-  c263: adjust-hue(rgb(0,0,0), 263);
-  c264: adjust-hue(rgb(0,0,0), 264);
-  c265: adjust-hue(rgb(0,0,0), 265);
-  c266: adjust-hue(rgb(0,0,0), 266);
-  c267: adjust-hue(rgb(0,0,0), 267);
-  c268: adjust-hue(rgb(0,0,0), 268);
-  c269: adjust-hue(rgb(0,0,0), 269);
-  c270: adjust-hue(rgb(0,0,0), 270);
-  c271: adjust-hue(rgb(0,0,0), 271);
-  c272: adjust-hue(rgb(0,0,0), 272);
-  c273: adjust-hue(rgb(0,0,0), 273);
-  c274: adjust-hue(rgb(0,0,0), 274);
-  c275: adjust-hue(rgb(0,0,0), 275);
-  c276: adjust-hue(rgb(0,0,0), 276);
-  c277: adjust-hue(rgb(0,0,0), 277);
-  c278: adjust-hue(rgb(0,0,0), 278);
-  c279: adjust-hue(rgb(0,0,0), 279);
-  c280: adjust-hue(rgb(0,0,0), 280);
-  c281: adjust-hue(rgb(0,0,0), 281);
-  c282: adjust-hue(rgb(0,0,0), 282);
-  c283: adjust-hue(rgb(0,0,0), 283);
-  c284: adjust-hue(rgb(0,0,0), 284);
-  c285: adjust-hue(rgb(0,0,0), 285);
-  c286: adjust-hue(rgb(0,0,0), 286);
-  c287: adjust-hue(rgb(0,0,0), 287);
-  c288: adjust-hue(rgb(0,0,0), 288);
-  c289: adjust-hue(rgb(0,0,0), 289);
-  c290: adjust-hue(rgb(0,0,0), 290);
-  c291: adjust-hue(rgb(0,0,0), 291);
-  c292: adjust-hue(rgb(0,0,0), 292);
-  c293: adjust-hue(rgb(0,0,0), 293);
-  c294: adjust-hue(rgb(0,0,0), 294);
-  c295: adjust-hue(rgb(0,0,0), 295);
-  c296: adjust-hue(rgb(0,0,0), 296);
-  c297: adjust-hue(rgb(0,0,0), 297);
-  c298: adjust-hue(rgb(0,0,0), 298);
-  c299: adjust-hue(rgb(0,0,0), 299);
-  c300: adjust-hue(rgb(0,0,0), 300);
-  c301: adjust-hue(rgb(0,0,0), 301);
-  c302: adjust-hue(rgb(0,0,0), 302);
-  c303: adjust-hue(rgb(0,0,0), 303);
-  c304: adjust-hue(rgb(0,0,0), 304);
-  c305: adjust-hue(rgb(0,0,0), 305);
-  c306: adjust-hue(rgb(0,0,0), 306);
-  c307: adjust-hue(rgb(0,0,0), 307);
-  c308: adjust-hue(rgb(0,0,0), 308);
-  c309: adjust-hue(rgb(0,0,0), 309);
-  c310: adjust-hue(rgb(0,0,0), 310);
-  c311: adjust-hue(rgb(0,0,0), 311);
-  c312: adjust-hue(rgb(0,0,0), 312);
-  c313: adjust-hue(rgb(0,0,0), 313);
-  c314: adjust-hue(rgb(0,0,0), 314);
-  c315: adjust-hue(rgb(0,0,0), 315);
-  c316: adjust-hue(rgb(0,0,0), 316);
-  c317: adjust-hue(rgb(0,0,0), 317);
-  c318: adjust-hue(rgb(0,0,0), 318);
-  c319: adjust-hue(rgb(0,0,0), 319);
-  c320: adjust-hue(rgb(0,0,0), 320);
-  c321: adjust-hue(rgb(0,0,0), 321);
-  c322: adjust-hue(rgb(0,0,0), 322);
-  c323: adjust-hue(rgb(0,0,0), 323);
-  c324: adjust-hue(rgb(0,0,0), 324);
-  c325: adjust-hue(rgb(0,0,0), 325);
-  c326: adjust-hue(rgb(0,0,0), 326);
-  c327: adjust-hue(rgb(0,0,0), 327);
-  c328: adjust-hue(rgb(0,0,0), 328);
-  c329: adjust-hue(rgb(0,0,0), 329);
-  c330: adjust-hue(rgb(0,0,0), 330);
-  c331: adjust-hue(rgb(0,0,0), 331);
-  c332: adjust-hue(rgb(0,0,0), 332);
-  c333: adjust-hue(rgb(0,0,0), 333);
-  c334: adjust-hue(rgb(0,0,0), 334);
-  c335: adjust-hue(rgb(0,0,0), 335);
-  c336: adjust-hue(rgb(0,0,0), 336);
-  c337: adjust-hue(rgb(0,0,0), 337);
-  c338: adjust-hue(rgb(0,0,0), 338);
-  c339: adjust-hue(rgb(0,0,0), 339);
-  c340: adjust-hue(rgb(0,0,0), 340);
-  c341: adjust-hue(rgb(0,0,0), 341);
-  c342: adjust-hue(rgb(0,0,0), 342);
-  c343: adjust-hue(rgb(0,0,0), 343);
-  c344: adjust-hue(rgb(0,0,0), 344);
-  c345: adjust-hue(rgb(0,0,0), 345);
-  c346: adjust-hue(rgb(0,0,0), 346);
-  c347: adjust-hue(rgb(0,0,0), 347);
-  c348: adjust-hue(rgb(0,0,0), 348);
-  c349: adjust-hue(rgb(0,0,0), 349);
-  c350: adjust-hue(rgb(0,0,0), 350);
-  c351: adjust-hue(rgb(0,0,0), 351);
-  c352: adjust-hue(rgb(0,0,0), 352);
-  c353: adjust-hue(rgb(0,0,0), 353);
-  c354: adjust-hue(rgb(0,0,0), 354);
-  c355: adjust-hue(rgb(0,0,0), 355);
-  c356: adjust-hue(rgb(0,0,0), 356);
-  c357: adjust-hue(rgb(0,0,0), 357);
-  c358: adjust-hue(rgb(0,0,0), 358);
-  c359: adjust-hue(rgb(0,0,0), 359);
-  c360: adjust-hue(rgb(0,0,0), 360);
-  c361: adjust-hue(rgb(0,0,0), 361);
-}
-
-<===> output.css
-foo {
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-  c-94: black;
-  c-93: black;
-  c-92: black;
-  c-91: black;
-  c-90: black;
-  c-89: black;
-  c-88: black;
-  c-87: black;
-  c-86: black;
-  c-85: black;
-  c-84: black;
-  c-83: black;
-  c-82: black;
-  c-81: black;
-  c-80: black;
-  c-79: black;
-  c-78: black;
-  c-77: black;
-  c-76: black;
-  c-75: black;
-  c-74: black;
-  c-73: black;
-  c-72: black;
-  c-71: black;
-  c-70: black;
-  c-69: black;
-  c-68: black;
-  c-67: black;
-  c-66: black;
-  c-65: black;
-  c-64: black;
-  c-63: black;
-  c-62: black;
-  c-61: black;
-  c-60: black;
-  c-59: black;
-  c-58: black;
-  c-57: black;
-  c-56: black;
-  c-55: black;
-  c-54: black;
-  c-53: black;
-  c-52: black;
-  c-51: black;
-  c-50: black;
-  c-49: black;
-  c-48: black;
-  c-47: black;
-  c-46: black;
-  c-45: black;
-  c-44: black;
-  c-43: black;
-  c-42: black;
-  c-41: black;
-  c-40: black;
-  c-39: black;
-  c-38: black;
-  c-37: black;
-  c-36: black;
-  c-35: black;
-  c-34: black;
-  c-33: black;
-  c-32: black;
-  c-31: black;
-  c-30: black;
-  c-29: black;
-  c-28: black;
-  c-27: black;
-  c-26: black;
-  c-25: black;
-  c-24: black;
-  c-23: black;
-  c-22: black;
-  c-21: black;
-  c-20: black;
-  c-19: black;
-  c-18: black;
-  c-17: black;
-  c-16: black;
-  c-15: black;
-  c-14: black;
-  c-13: black;
-  c-12: black;
-  c-11: black;
-  c-10: black;
-  c-9: black;
-  c-8: black;
-  c-7: black;
-  c-6: black;
-  c-5: black;
-  c-4: black;
-  c-3: black;
-  c-2: black;
-  c-1: black;
-  c0: black;
-  c1: black;
-  c2: black;
-  c3: black;
-  c4: black;
-  c5: black;
-  c6: black;
-  c7: black;
-  c8: black;
-  c9: black;
-  c10: black;
-  c11: black;
-  c12: black;
-  c13: black;
-  c14: black;
-  c15: black;
-  c16: black;
-  c17: black;
-  c18: black;
-  c19: black;
-  c20: black;
-  c21: black;
-  c22: black;
-  c23: black;
-  c24: black;
-  c25: black;
-  c26: black;
-  c27: black;
-  c28: black;
-  c29: black;
-  c30: black;
-  c31: black;
-  c32: black;
-  c33: black;
-  c34: black;
-  c35: black;
-  c36: black;
-  c37: black;
-  c38: black;
-  c39: black;
-  c40: black;
-  c41: black;
-  c42: black;
-  c43: black;
-  c44: black;
-  c45: black;
-  c46: black;
-  c47: black;
-  c48: black;
-  c49: black;
-  c50: black;
-  c51: black;
-  c52: black;
-  c53: black;
-  c54: black;
-  c55: black;
-  c56: black;
-  c57: black;
-  c58: black;
-  c59: black;
-  c60: black;
-  c61: black;
-  c62: black;
-  c63: black;
-  c64: black;
-  c65: black;
-  c66: black;
-  c67: black;
-  c68: black;
-  c69: black;
-  c70: black;
-  c71: black;
-  c72: black;
-  c73: black;
-  c74: black;
-  c75: black;
-  c76: black;
-  c77: black;
-  c78: black;
-  c79: black;
-  c80: black;
-  c81: black;
-  c82: black;
-  c83: black;
-  c84: black;
-  c85: black;
-  c86: black;
-  c87: black;
-  c88: black;
-  c89: black;
-  c90: black;
-  c91: black;
-  c92: black;
-  c93: black;
-  c94: black;
-  c95: black;
-  c96: black;
-  c97: black;
-  c98: black;
-  c99: black;
-  c100: black;
-  c101: black;
-  c102: black;
-  c103: black;
-  c104: black;
-  c105: black;
-  c106: black;
-  c107: black;
-  c108: black;
-  c109: black;
-  c110: black;
-  c111: black;
-  c112: black;
-  c113: black;
-  c114: black;
-  c115: black;
-  c116: black;
-  c117: black;
-  c118: black;
-  c119: black;
-  c120: black;
-  c121: black;
-  c122: black;
-  c123: black;
-  c124: black;
-  c125: black;
-  c126: black;
-  c127: black;
-  c128: black;
-  c129: black;
-  c130: black;
-  c131: black;
-  c132: black;
-  c133: black;
-  c134: black;
-  c135: black;
-  c136: black;
-  c137: black;
-  c138: black;
-  c139: black;
-  c140: black;
-  c141: black;
-  c142: black;
-  c143: black;
-  c144: black;
-  c145: black;
-  c146: black;
-  c147: black;
-  c148: black;
-  c149: black;
-  c150: black;
-  c151: black;
-  c152: black;
-  c153: black;
-  c154: black;
-  c155: black;
-  c156: black;
-  c157: black;
-  c158: black;
-  c159: black;
-  c160: black;
-  c161: black;
-  c162: black;
-  c163: black;
-  c164: black;
-  c165: black;
-  c166: black;
-  c167: black;
-  c168: black;
-  c169: black;
-  c170: black;
-  c171: black;
-  c172: black;
-  c173: black;
-  c174: black;
-  c175: black;
-  c176: black;
-  c177: black;
-  c178: black;
-  c179: black;
-  c180: black;
-  c181: black;
-  c182: black;
-  c183: black;
-  c184: black;
-  c185: black;
-  c186: black;
-  c187: black;
-  c188: black;
-  c189: black;
-  c190: black;
-  c191: black;
-  c192: black;
-  c193: black;
-  c194: black;
-  c195: black;
-  c196: black;
-  c197: black;
-  c198: black;
-  c199: black;
-  c200: black;
-  c201: black;
-  c202: black;
-  c203: black;
-  c204: black;
-  c205: black;
-  c206: black;
-  c207: black;
-  c208: black;
-  c209: black;
-  c210: black;
-  c211: black;
-  c212: black;
-  c213: black;
-  c214: black;
-  c215: black;
-  c216: black;
-  c217: black;
-  c218: black;
-  c219: black;
-  c220: black;
-  c221: black;
-  c222: black;
-  c223: black;
-  c224: black;
-  c225: black;
-  c226: black;
-  c227: black;
-  c228: black;
-  c229: black;
-  c230: black;
-  c231: black;
-  c232: black;
-  c233: black;
-  c234: black;
-  c235: black;
-  c236: black;
-  c237: black;
-  c238: black;
-  c239: black;
-  c240: black;
-  c241: black;
-  c242: black;
-  c243: black;
-  c244: black;
-  c245: black;
-  c246: black;
-  c247: black;
-  c248: black;
-  c249: black;
-  c250: black;
-  c251: black;
-  c252: black;
-  c253: black;
-  c254: black;
-  c255: black;
-  c256: black;
-  c257: black;
-  c258: black;
-  c259: black;
-  c260: black;
-  c261: black;
-  c262: black;
-  c263: black;
-  c264: black;
-  c265: black;
-  c266: black;
-  c267: black;
-  c268: black;
-  c269: black;
-  c270: black;
-  c271: black;
-  c272: black;
-  c273: black;
-  c274: black;
-  c275: black;
-  c276: black;
-  c277: black;
-  c278: black;
-  c279: black;
-  c280: black;
-  c281: black;
-  c282: black;
-  c283: black;
-  c284: black;
-  c285: black;
-  c286: black;
-  c287: black;
-  c288: black;
-  c289: black;
-  c290: black;
-  c291: black;
-  c292: black;
-  c293: black;
-  c294: black;
-  c295: black;
-  c296: black;
-  c297: black;
-  c298: black;
-  c299: black;
-  c300: black;
-  c301: black;
-  c302: black;
-  c303: black;
-  c304: black;
-  c305: black;
-  c306: black;
-  c307: black;
-  c308: black;
-  c309: black;
-  c310: black;
-  c311: black;
-  c312: black;
-  c313: black;
-  c314: black;
-  c315: black;
-  c316: black;
-  c317: black;
-  c318: black;
-  c319: black;
-  c320: black;
-  c321: black;
-  c322: black;
-  c323: black;
-  c324: black;
-  c325: black;
-  c326: black;
-  c327: black;
-  c328: black;
-  c329: black;
-  c330: black;
-  c331: black;
-  c332: black;
-  c333: black;
-  c334: black;
-  c335: black;
-  c336: black;
-  c337: black;
-  c338: black;
-  c339: black;
-  c340: black;
-  c341: black;
-  c342: black;
-  c343: black;
-  c344: black;
-  c345: black;
-  c346: black;
-  c347: black;
-  c348: black;
-  c349: black;
-  c350: black;
-  c351: black;
-  c352: black;
-  c353: black;
-  c354: black;
-  c355: black;
-  c356: black;
-  c357: black;
-  c358: black;
-  c359: black;
-  c360: black;
-  c361: black;
-}
diff --git a/spec/libsass/color-functions/hsl/complement.hrx b/spec/libsass/color-functions/hsl/complement.hrx
deleted file mode 100644
index 0ce30692c1..0000000000
--- a/spec/libsass/color-functions/hsl/complement.hrx
+++ /dev/null
@@ -1,209 +0,0 @@
-<===> input.scss
-foo {
-  c0: desaturate(hsl(100, 100%, 0), 0%);
-  c1: desaturate(hsl(100, 100%, 0), 1%);
-  c2: desaturate(hsl(100, 100%, 0), 2%);
-  c3: desaturate(hsl(100, 100%, 0), 3%);
-  c4: desaturate(hsl(100, 100%, 0), 4%);
-  c5: desaturate(hsl(100, 100%, 0), 5%);
-  c6: desaturate(hsl(100, 100%, 0), 6%);
-  c7: desaturate(hsl(100, 100%, 0), 7%);
-  c8: desaturate(hsl(100, 100%, 0), 8%);
-  c9: desaturate(hsl(100, 100%, 0), 9%);
-  c10: desaturate(hsl(100, 100%, 0), 10%);
-  c11: desaturate(hsl(100, 100%, 0), 11%);
-  c12: desaturate(hsl(100, 100%, 0), 12%);
-  c13: desaturate(hsl(100, 100%, 0), 13%);
-  c14: desaturate(hsl(100, 100%, 0), 14%);
-  c15: desaturate(hsl(100, 100%, 0), 15%);
-  c16: desaturate(hsl(100, 100%, 0), 16%);
-  c17: desaturate(hsl(100, 100%, 0), 17%);
-  c18: desaturate(hsl(100, 100%, 0), 18%);
-  c19: desaturate(hsl(100, 100%, 0), 19%);
-  c20: desaturate(hsl(100, 100%, 0), 20%);
-  c21: desaturate(hsl(100, 100%, 0), 21%);
-  c22: desaturate(hsl(100, 100%, 0), 22%);
-  c23: desaturate(hsl(100, 100%, 0), 23%);
-  c24: desaturate(hsl(100, 100%, 0), 24%);
-  c25: desaturate(hsl(100, 100%, 0), 25%);
-  c26: desaturate(hsl(100, 100%, 0), 26%);
-  c27: desaturate(hsl(100, 100%, 0), 27%);
-  c28: desaturate(hsl(100, 100%, 0), 28%);
-  c29: desaturate(hsl(100, 100%, 0), 29%);
-  c30: desaturate(hsl(100, 100%, 0), 30%);
-  c31: desaturate(hsl(100, 100%, 0), 31%);
-  c32: desaturate(hsl(100, 100%, 0), 32%);
-  c33: desaturate(hsl(100, 100%, 0), 33%);
-  c34: desaturate(hsl(100, 100%, 0), 34%);
-  c35: desaturate(hsl(100, 100%, 0), 35%);
-  c36: desaturate(hsl(100, 100%, 0), 36%);
-  c37: desaturate(hsl(100, 100%, 0), 37%);
-  c38: desaturate(hsl(100, 100%, 0), 38%);
-  c39: desaturate(hsl(100, 100%, 0), 39%);
-  c40: desaturate(hsl(100, 100%, 0), 40%);
-  c41: desaturate(hsl(100, 100%, 0), 41%);
-  c42: desaturate(hsl(100, 100%, 0), 42%);
-  c43: desaturate(hsl(100, 100%, 0), 43%);
-  c44: desaturate(hsl(100, 100%, 0), 44%);
-  c45: desaturate(hsl(100, 100%, 0), 45%);
-  c46: desaturate(hsl(100, 100%, 0), 46%);
-  c47: desaturate(hsl(100, 100%, 0), 47%);
-  c48: desaturate(hsl(100, 100%, 0), 48%);
-  c49: desaturate(hsl(100, 100%, 0), 49%);
-  c50: desaturate(hsl(100, 100%, 0), 50%);
-  c51: desaturate(hsl(100, 100%, 0), 51%);
-  c52: desaturate(hsl(100, 100%, 0), 52%);
-  c53: desaturate(hsl(100, 100%, 0), 53%);
-  c54: desaturate(hsl(100, 100%, 0), 54%);
-  c55: desaturate(hsl(100, 100%, 0), 55%);
-  c56: desaturate(hsl(100, 100%, 0), 56%);
-  c57: desaturate(hsl(100, 100%, 0), 57%);
-  c58: desaturate(hsl(100, 100%, 0), 58%);
-  c59: desaturate(hsl(100, 100%, 0), 59%);
-  c60: desaturate(hsl(100, 100%, 0), 60%);
-  c61: desaturate(hsl(100, 100%, 0), 61%);
-  c62: desaturate(hsl(100, 100%, 0), 62%);
-  c63: desaturate(hsl(100, 100%, 0), 63%);
-  c64: desaturate(hsl(100, 100%, 0), 64%);
-  c65: desaturate(hsl(100, 100%, 0), 65%);
-  c66: desaturate(hsl(100, 100%, 0), 66%);
-  c67: desaturate(hsl(100, 100%, 0), 67%);
-  c68: desaturate(hsl(100, 100%, 0), 68%);
-  c69: desaturate(hsl(100, 100%, 0), 69%);
-  c70: desaturate(hsl(100, 100%, 0), 70%);
-  c71: desaturate(hsl(100, 100%, 0), 71%);
-  c72: desaturate(hsl(100, 100%, 0), 72%);
-  c73: desaturate(hsl(100, 100%, 0), 73%);
-  c74: desaturate(hsl(100, 100%, 0), 74%);
-  c75: desaturate(hsl(100, 100%, 0), 75%);
-  c76: desaturate(hsl(100, 100%, 0), 76%);
-  c77: desaturate(hsl(100, 100%, 0), 77%);
-  c78: desaturate(hsl(100, 100%, 0), 78%);
-  c79: desaturate(hsl(100, 100%, 0), 79%);
-  c80: desaturate(hsl(100, 100%, 0), 80%);
-  c81: desaturate(hsl(100, 100%, 0), 81%);
-  c82: desaturate(hsl(100, 100%, 0), 82%);
-  c83: desaturate(hsl(100, 100%, 0), 83%);
-  c84: desaturate(hsl(100, 100%, 0), 84%);
-  c85: desaturate(hsl(100, 100%, 0), 85%);
-  c86: desaturate(hsl(100, 100%, 0), 86%);
-  c87: desaturate(hsl(100, 100%, 0), 87%);
-  c88: desaturate(hsl(100, 100%, 0), 88%);
-  c89: desaturate(hsl(100, 100%, 0), 89%);
-  c90: desaturate(hsl(100, 100%, 0), 90%);
-  c91: desaturate(hsl(100, 100%, 0), 91%);
-  c92: desaturate(hsl(100, 100%, 0), 92%);
-  c93: desaturate(hsl(100, 100%, 0), 93%);
-  c94: desaturate(hsl(100, 100%, 0), 94%);
-  c95: desaturate(hsl(100, 100%, 0), 95%);
-  c96: desaturate(hsl(100, 100%, 0), 96%);
-  c97: desaturate(hsl(100, 100%, 0), 97%);
-  c98: desaturate(hsl(100, 100%, 0), 98%);
-  c99: desaturate(hsl(100, 100%, 0), 99%);
-  c100: desaturate(hsl(100, 100%, 0), 100%);
-}
-
-<===> output.css
-foo {
-  c0: black;
-  c1: black;
-  c2: black;
-  c3: black;
-  c4: black;
-  c5: black;
-  c6: black;
-  c7: black;
-  c8: black;
-  c9: black;
-  c10: black;
-  c11: black;
-  c12: black;
-  c13: black;
-  c14: black;
-  c15: black;
-  c16: black;
-  c17: black;
-  c18: black;
-  c19: black;
-  c20: black;
-  c21: black;
-  c22: black;
-  c23: black;
-  c24: black;
-  c25: black;
-  c26: black;
-  c27: black;
-  c28: black;
-  c29: black;
-  c30: black;
-  c31: black;
-  c32: black;
-  c33: black;
-  c34: black;
-  c35: black;
-  c36: black;
-  c37: black;
-  c38: black;
-  c39: black;
-  c40: black;
-  c41: black;
-  c42: black;
-  c43: black;
-  c44: black;
-  c45: black;
-  c46: black;
-  c47: black;
-  c48: black;
-  c49: black;
-  c50: black;
-  c51: black;
-  c52: black;
-  c53: black;
-  c54: black;
-  c55: black;
-  c56: black;
-  c57: black;
-  c58: black;
-  c59: black;
-  c60: black;
-  c61: black;
-  c62: black;
-  c63: black;
-  c64: black;
-  c65: black;
-  c66: black;
-  c67: black;
-  c68: black;
-  c69: black;
-  c70: black;
-  c71: black;
-  c72: black;
-  c73: black;
-  c74: black;
-  c75: black;
-  c76: black;
-  c77: black;
-  c78: black;
-  c79: black;
-  c80: black;
-  c81: black;
-  c82: black;
-  c83: black;
-  c84: black;
-  c85: black;
-  c86: black;
-  c87: black;
-  c88: black;
-  c89: black;
-  c90: black;
-  c91: black;
-  c92: black;
-  c93: black;
-  c94: black;
-  c95: black;
-  c96: black;
-  c97: black;
-  c98: black;
-  c99: black;
-  c100: black;
-}
diff --git a/spec/libsass/color-functions/hsl/darken.hrx b/spec/libsass/color-functions/hsl/darken.hrx
deleted file mode 100644
index efa6568308..0000000000
--- a/spec/libsass/color-functions/hsl/darken.hrx
+++ /dev/null
@@ -1,209 +0,0 @@
-<===> input.scss
-foo {
-  c0: darken(white, 0%);
-  c1: darken(white, 1%);
-  c2: darken(white, 2%);
-  c3: darken(white, 3%);
-  c4: darken(white, 4%);
-  c5: darken(white, 5%);
-  c6: darken(white, 6%);
-  c7: darken(white, 7%);
-  c8: darken(white, 8%);
-  c9: darken(white, 9%);
-  c10: darken(white, 10%);
-  c11: darken(white, 11%);
-  c12: darken(white, 12%);
-  c13: darken(white, 13%);
-  c14: darken(white, 14%);
-  c15: darken(white, 15%);
-  c16: darken(white, 16%);
-  c17: darken(white, 17%);
-  c18: darken(white, 18%);
-  c19: darken(white, 19%);
-  c20: darken(white, 20%);
-  c21: darken(white, 21%);
-  c22: darken(white, 22%);
-  c23: darken(white, 23%);
-  c24: darken(white, 24%);
-  c25: darken(white, 25%);
-  c26: darken(white, 26%);
-  c27: darken(white, 27%);
-  c28: darken(white, 28%);
-  c29: darken(white, 29%);
-  c30: darken(white, 30%);
-  c31: darken(white, 31%);
-  c32: darken(white, 32%);
-  c33: darken(white, 33%);
-  c34: darken(white, 34%);
-  c35: darken(white, 35%);
-  c36: darken(white, 36%);
-  c37: darken(white, 37%);
-  c38: darken(white, 38%);
-  c39: darken(white, 39%);
-  c40: darken(white, 40%);
-  c41: darken(white, 41%);
-  c42: darken(white, 42%);
-  c43: darken(white, 43%);
-  c44: darken(white, 44%);
-  c45: darken(white, 45%);
-  c46: darken(white, 46%);
-  c47: darken(white, 47%);
-  c48: darken(white, 48%);
-  c49: darken(white, 49%);
-  c50: darken(white, 50%);
-  c51: darken(white, 51%);
-  c52: darken(white, 52%);
-  c53: darken(white, 53%);
-  c54: darken(white, 54%);
-  c55: darken(white, 55%);
-  c56: darken(white, 56%);
-  c57: darken(white, 57%);
-  c58: darken(white, 58%);
-  c59: darken(white, 59%);
-  c60: darken(white, 60%);
-  c61: darken(white, 61%);
-  c62: darken(white, 62%);
-  c63: darken(white, 63%);
-  c64: darken(white, 64%);
-  c65: darken(white, 65%);
-  c66: darken(white, 66%);
-  c67: darken(white, 67%);
-  c68: darken(white, 68%);
-  c69: darken(white, 69%);
-  c70: darken(white, 70%);
-  c71: darken(white, 71%);
-  c72: darken(white, 72%);
-  c73: darken(white, 73%);
-  c74: darken(white, 74%);
-  c75: darken(white, 75%);
-  c76: darken(white, 76%);
-  c77: darken(white, 77%);
-  c78: darken(white, 78%);
-  c79: darken(white, 79%);
-  c80: darken(white, 80%);
-  c81: darken(white, 81%);
-  c82: darken(white, 82%);
-  c83: darken(white, 83%);
-  c84: darken(white, 84%);
-  c85: darken(white, 85%);
-  c86: darken(white, 86%);
-  c87: darken(white, 87%);
-  c88: darken(white, 88%);
-  c89: darken(white, 89%);
-  c90: darken(white, 90%);
-  c91: darken(white, 91%);
-  c92: darken(white, 92%);
-  c93: darken(white, 93%);
-  c94: darken(white, 94%);
-  c95: darken(white, 95%);
-  c96: darken(white, 96%);
-  c97: darken(white, 97%);
-  c98: darken(white, 98%);
-  c99: darken(white, 99%);
-  c100: darken(white, 100%);
-}
-
-<===> output.css
-foo {
-  c0: white;
-  c1: #fcfcfc;
-  c2: #fafafa;
-  c3: #f7f7f7;
-  c4: whitesmoke;
-  c5: #f2f2f2;
-  c6: #f0f0f0;
-  c7: #ededed;
-  c8: #ebebeb;
-  c9: #e8e8e8;
-  c10: #e6e6e6;
-  c11: #e3e3e3;
-  c12: #e0e0e0;
-  c13: #dedede;
-  c14: #dbdbdb;
-  c15: #d9d9d9;
-  c16: #d6d6d6;
-  c17: #d4d4d4;
-  c18: #d1d1d1;
-  c19: #cfcfcf;
-  c20: #cccccc;
-  c21: #c9c9c9;
-  c22: #c7c7c7;
-  c23: #c4c4c4;
-  c24: #c2c2c2;
-  c25: #bfbfbf;
-  c26: #bdbdbd;
-  c27: #bababa;
-  c28: #b8b8b8;
-  c29: #b5b5b5;
-  c30: #b3b3b3;
-  c31: #b0b0b0;
-  c32: #adadad;
-  c33: #ababab;
-  c34: #a8a8a8;
-  c35: #a6a6a6;
-  c36: #a3a3a3;
-  c37: #a1a1a1;
-  c38: #9e9e9e;
-  c39: #9c9c9c;
-  c40: #999999;
-  c41: #969696;
-  c42: #949494;
-  c43: #919191;
-  c44: #8f8f8f;
-  c45: #8c8c8c;
-  c46: #8a8a8a;
-  c47: #878787;
-  c48: #858585;
-  c49: #828282;
-  c50: gray;
-  c51: #7d7d7d;
-  c52: #7a7a7a;
-  c53: #787878;
-  c54: #757575;
-  c55: #737373;
-  c56: #707070;
-  c57: #6e6e6e;
-  c58: #6b6b6b;
-  c59: dimgray;
-  c60: #666666;
-  c61: #636363;
-  c62: #616161;
-  c63: #5e5e5e;
-  c64: #5c5c5c;
-  c65: #595959;
-  c66: #575757;
-  c67: #545454;
-  c68: #525252;
-  c69: #4f4f4f;
-  c70: #4d4d4d;
-  c71: #4a4a4a;
-  c72: #474747;
-  c73: #454545;
-  c74: #424242;
-  c75: #404040;
-  c76: #3d3d3d;
-  c77: #3b3b3b;
-  c78: #383838;
-  c79: #363636;
-  c80: #333333;
-  c81: #303030;
-  c82: #2e2e2e;
-  c83: #2b2b2b;
-  c84: #292929;
-  c85: #262626;
-  c86: #242424;
-  c87: #212121;
-  c88: #1f1f1f;
-  c89: #1c1c1c;
-  c90: #1a1a1a;
-  c91: #171717;
-  c92: #141414;
-  c93: #121212;
-  c94: #0f0f0f;
-  c95: #0d0d0d;
-  c96: #0a0a0a;
-  c97: #080808;
-  c98: #050505;
-  c99: #030303;
-  c100: black;
-}
diff --git a/spec/libsass/color-functions/hsl/desaturate.hrx b/spec/libsass/color-functions/hsl/desaturate.hrx
deleted file mode 100644
index d14f07bbfa..0000000000
--- a/spec/libsass/color-functions/hsl/desaturate.hrx
+++ /dev/null
@@ -1,209 +0,0 @@
-<===> input.scss
-foo {
-  c0: desaturate(hsl(100, 100%, 50%), 0%);
-  c1: desaturate(hsl(100, 100%, 50%), 1%);
-  c2: desaturate(hsl(100, 100%, 50%), 2%);
-  c3: desaturate(hsl(100, 100%, 50%), 3%);
-  c4: desaturate(hsl(100, 100%, 50%), 4%);
-  c5: desaturate(hsl(100, 100%, 50%), 5%);
-  c6: desaturate(hsl(100, 100%, 50%), 6%);
-  c7: desaturate(hsl(100, 100%, 50%), 7%);
-  c8: desaturate(hsl(100, 100%, 50%), 8%);
-  c9: desaturate(hsl(100, 100%, 50%), 9%);
-  c10: desaturate(hsl(100, 100%, 50%), 10%);
-  c11: desaturate(hsl(100, 100%, 50%), 11%);
-  c12: desaturate(hsl(100, 100%, 50%), 12%);
-  c13: desaturate(hsl(100, 100%, 50%), 13%);
-  c14: desaturate(hsl(100, 100%, 50%), 14%);
-  c15: desaturate(hsl(100, 100%, 50%), 15%);
-  c16: desaturate(hsl(100, 100%, 50%), 16%);
-  c17: desaturate(hsl(100, 100%, 50%), 17%);
-  c18: desaturate(hsl(100, 100%, 50%), 18%);
-  c19: desaturate(hsl(100, 100%, 50%), 19%);
-  c20: desaturate(hsl(100, 100%, 50%), 20%);
-  c21: desaturate(hsl(100, 100%, 50%), 21%);
-  c22: desaturate(hsl(100, 100%, 50%), 22%);
-  c23: desaturate(hsl(100, 100%, 50%), 23%);
-  c24: desaturate(hsl(100, 100%, 50%), 24%);
-  c25: desaturate(hsl(100, 100%, 50%), 25%);
-  c26: desaturate(hsl(100, 100%, 50%), 26%);
-  c27: desaturate(hsl(100, 100%, 50%), 27%);
-  c28: desaturate(hsl(100, 100%, 50%), 28%);
-  c29: desaturate(hsl(100, 100%, 50%), 29%);
-  c30: desaturate(hsl(100, 100%, 50%), 30%);
-  c31: desaturate(hsl(100, 100%, 50%), 31%);
-  c32: desaturate(hsl(100, 100%, 50%), 32%);
-  c33: desaturate(hsl(100, 100%, 50%), 33%);
-  c34: desaturate(hsl(100, 100%, 50%), 34%);
-  c35: desaturate(hsl(100, 100%, 50%), 35%);
-  c36: desaturate(hsl(100, 100%, 50%), 36%);
-  c37: desaturate(hsl(100, 100%, 50%), 37%);
-  c38: desaturate(hsl(100, 100%, 50%), 38%);
-  c39: desaturate(hsl(100, 100%, 50%), 39%);
-  c40: desaturate(hsl(100, 100%, 50%), 40%);
-  c41: desaturate(hsl(100, 100%, 50%), 41%);
-  c42: desaturate(hsl(100, 100%, 50%), 42%);
-  c43: desaturate(hsl(100, 100%, 50%), 43%);
-  c44: desaturate(hsl(100, 100%, 50%), 44%);
-  c45: desaturate(hsl(100, 100%, 50%), 45%);
-  c46: desaturate(hsl(100, 100%, 50%), 46%);
-  c47: desaturate(hsl(100, 100%, 50%), 47%);
-  c48: desaturate(hsl(100, 100%, 50%), 48%);
-  c49: desaturate(hsl(100, 100%, 50%), 49%);
-  c50: desaturate(hsl(100, 100%, 50%), 50%);
-  c51: desaturate(hsl(100, 100%, 50%), 51%);
-  c52: desaturate(hsl(100, 100%, 50%), 52%);
-  c53: desaturate(hsl(100, 100%, 50%), 53%);
-  c54: desaturate(hsl(100, 100%, 50%), 54%);
-  c55: desaturate(hsl(100, 100%, 50%), 55%);
-  c56: desaturate(hsl(100, 100%, 50%), 56%);
-  c57: desaturate(hsl(100, 100%, 50%), 57%);
-  c58: desaturate(hsl(100, 100%, 50%), 58%);
-  c59: desaturate(hsl(100, 100%, 50%), 59%);
-  c60: desaturate(hsl(100, 100%, 50%), 60%);
-  c61: desaturate(hsl(100, 100%, 50%), 61%);
-  c62: desaturate(hsl(100, 100%, 50%), 62%);
-  c63: desaturate(hsl(100, 100%, 50%), 63%);
-  c64: desaturate(hsl(100, 100%, 50%), 64%);
-  c65: desaturate(hsl(100, 100%, 50%), 65%);
-  c66: desaturate(hsl(100, 100%, 50%), 66%);
-  c67: desaturate(hsl(100, 100%, 50%), 67%);
-  c68: desaturate(hsl(100, 100%, 50%), 68%);
-  c69: desaturate(hsl(100, 100%, 50%), 69%);
-  c70: desaturate(hsl(100, 100%, 50%), 70%);
-  c71: desaturate(hsl(100, 100%, 50%), 71%);
-  c72: desaturate(hsl(100, 100%, 50%), 72%);
-  c73: desaturate(hsl(100, 100%, 50%), 73%);
-  c74: desaturate(hsl(100, 100%, 50%), 74%);
-  c75: desaturate(hsl(100, 100%, 50%), 75%);
-  c76: desaturate(hsl(100, 100%, 50%), 76%);
-  c77: desaturate(hsl(100, 100%, 50%), 77%);
-  c78: desaturate(hsl(100, 100%, 50%), 78%);
-  c79: desaturate(hsl(100, 100%, 50%), 79%);
-  c80: desaturate(hsl(100, 100%, 50%), 80%);
-  c81: desaturate(hsl(100, 100%, 50%), 81%);
-  c82: desaturate(hsl(100, 100%, 50%), 82%);
-  c83: desaturate(hsl(100, 100%, 50%), 83%);
-  c84: desaturate(hsl(100, 100%, 50%), 84%);
-  c85: desaturate(hsl(100, 100%, 50%), 85%);
-  c86: desaturate(hsl(100, 100%, 50%), 86%);
-  c87: desaturate(hsl(100, 100%, 50%), 87%);
-  c88: desaturate(hsl(100, 100%, 50%), 88%);
-  c89: desaturate(hsl(100, 100%, 50%), 89%);
-  c90: desaturate(hsl(100, 100%, 50%), 90%);
-  c91: desaturate(hsl(100, 100%, 50%), 91%);
-  c92: desaturate(hsl(100, 100%, 50%), 92%);
-  c93: desaturate(hsl(100, 100%, 50%), 93%);
-  c94: desaturate(hsl(100, 100%, 50%), 94%);
-  c95: desaturate(hsl(100, 100%, 50%), 95%);
-  c96: desaturate(hsl(100, 100%, 50%), 96%);
-  c97: desaturate(hsl(100, 100%, 50%), 97%);
-  c98: desaturate(hsl(100, 100%, 50%), 98%);
-  c99: desaturate(hsl(100, 100%, 50%), 99%);
-  c100: desaturate(hsl(100, 100%, 50%), 100%);
-}
-
-<===> output.css
-foo {
-  c0: #55ff00;
-  c1: #55fe01;
-  c2: #56fc03;
-  c3: #56fb04;
-  c4: #57fa05;
-  c5: #57f906;
-  c6: #58f708;
-  c7: #58f609;
-  c8: #58f50a;
-  c9: #59f40b;
-  c10: #59f20d;
-  c11: #5af10e;
-  c12: #5af00f;
-  c13: #5bee11;
-  c14: #5bed12;
-  c15: #5bec13;
-  c16: #5ceb14;
-  c17: #5ce916;
-  c18: #5de817;
-  c19: #5de718;
-  c20: #5ee61a;
-  c21: #5ee41b;
-  c22: #5ee31c;
-  c23: #5fe21d;
-  c24: #5fe01f;
-  c25: #60df20;
-  c26: #60de21;
-  c27: #60dd22;
-  c28: #61db24;
-  c29: #61da25;
-  c30: #62d926;
-  c31: #62d728;
-  c32: #63d629;
-  c33: #63d52a;
-  c34: #63d42b;
-  c35: #64d22d;
-  c36: #64d12e;
-  c37: #65d02f;
-  c38: #65cf30;
-  c39: #66cd32;
-  c40: #66cc33;
-  c41: #66cb34;
-  c42: #67c936;
-  c43: #67c837;
-  c44: #68c738;
-  c45: #68c639;
-  c46: #69c43b;
-  c47: #69c33c;
-  c48: #69c23d;
-  c49: #6ac13e;
-  c50: #6abf40;
-  c51: #6bbe41;
-  c52: #6bbd42;
-  c53: #6cbb44;
-  c54: #6cba45;
-  c55: #6cb946;
-  c56: #6db847;
-  c57: #6db649;
-  c58: #6eb54a;
-  c59: #6eb44b;
-  c60: #6fb34d;
-  c61: #6fb14e;
-  c62: #6fb04f;
-  c63: #70af50;
-  c64: #70ad52;
-  c65: #71ac53;
-  c66: #71ab54;
-  c67: #71aa55;
-  c68: #72a857;
-  c69: #72a758;
-  c70: #73a659;
-  c71: #73a45b;
-  c72: #74a35c;
-  c73: #74a25d;
-  c74: #74a15e;
-  c75: #759f60;
-  c76: #759e61;
-  c77: #769d62;
-  c78: #769c63;
-  c79: #779a65;
-  c80: #779966;
-  c81: #779867;
-  c82: #789669;
-  c83: #78956a;
-  c84: #79946b;
-  c85: #79936c;
-  c86: #7a916e;
-  c87: #7a906f;
-  c88: #7a8f70;
-  c89: #7b8e71;
-  c90: #7b8c73;
-  c91: #7c8b74;
-  c92: #7c8a75;
-  c93: #7d8877;
-  c94: #7d8778;
-  c95: #7d8679;
-  c96: #7e857a;
-  c97: #7e837c;
-  c98: #7f827d;
-  c99: #7f817e;
-  c100: gray;
-}
diff --git a/spec/libsass/color-functions/hsl/hue.hrx b/spec/libsass/color-functions/hsl/hue.hrx
deleted file mode 100644
index 29b9c4a8c7..0000000000
--- a/spec/libsass/color-functions/hsl/hue.hrx
+++ /dev/null
@@ -1,1453 +0,0 @@
-<===> input.scss
-foo {
-  c-361: hue(hsl(-361%, 100%, 50%));
-  c-360: hue(hsl(-360%, 100%, 50%));
-  c-359: hue(hsl(-359%, 100%, 50%));
-  c-358: hue(hsl(-358%, 100%, 50%));
-  c-357: hue(hsl(-357%, 100%, 50%));
-  c-356: hue(hsl(-356%, 100%, 50%));
-  c-355: hue(hsl(-355%, 100%, 50%));
-  c-354: hue(hsl(-354%, 100%, 50%));
-  c-353: hue(hsl(-353%, 100%, 50%));
-  c-352: hue(hsl(-352%, 100%, 50%));
-  c-351: hue(hsl(-351%, 100%, 50%));
-  c-350: hue(hsl(-350%, 100%, 50%));
-  c-349: hue(hsl(-349%, 100%, 50%));
-  c-348: hue(hsl(-348%, 100%, 50%));
-  c-347: hue(hsl(-347%, 100%, 50%));
-  c-346: hue(hsl(-346%, 100%, 50%));
-  c-345: hue(hsl(-345%, 100%, 50%));
-  c-344: hue(hsl(-344%, 100%, 50%));
-  c-343: hue(hsl(-343%, 100%, 50%));
-  c-342: hue(hsl(-342%, 100%, 50%));
-  c-341: hue(hsl(-341%, 100%, 50%));
-  c-340: hue(hsl(-340%, 100%, 50%));
-  c-339: hue(hsl(-339%, 100%, 50%));
-  c-338: hue(hsl(-338%, 100%, 50%));
-  c-337: hue(hsl(-337%, 100%, 50%));
-  c-336: hue(hsl(-336%, 100%, 50%));
-  c-335: hue(hsl(-335%, 100%, 50%));
-  c-334: hue(hsl(-334%, 100%, 50%));
-  c-333: hue(hsl(-333%, 100%, 50%));
-  c-332: hue(hsl(-332%, 100%, 50%));
-  c-331: hue(hsl(-331%, 100%, 50%));
-  c-330: hue(hsl(-330%, 100%, 50%));
-  c-329: hue(hsl(-329%, 100%, 50%));
-  c-328: hue(hsl(-328%, 100%, 50%));
-  c-327: hue(hsl(-327%, 100%, 50%));
-  c-326: hue(hsl(-326%, 100%, 50%));
-  c-325: hue(hsl(-325%, 100%, 50%));
-  c-324: hue(hsl(-324%, 100%, 50%));
-  c-323: hue(hsl(-323%, 100%, 50%));
-  c-322: hue(hsl(-322%, 100%, 50%));
-  c-321: hue(hsl(-321%, 100%, 50%));
-  c-320: hue(hsl(-320%, 100%, 50%));
-  c-319: hue(hsl(-319%, 100%, 50%));
-  c-318: hue(hsl(-318%, 100%, 50%));
-  c-317: hue(hsl(-317%, 100%, 50%));
-  c-316: hue(hsl(-316%, 100%, 50%));
-  c-315: hue(hsl(-315%, 100%, 50%));
-  c-314: hue(hsl(-314%, 100%, 50%));
-  c-313: hue(hsl(-313%, 100%, 50%));
-  c-312: hue(hsl(-312%, 100%, 50%));
-  c-311: hue(hsl(-311%, 100%, 50%));
-  c-310: hue(hsl(-310%, 100%, 50%));
-  c-309: hue(hsl(-309%, 100%, 50%));
-  c-308: hue(hsl(-308%, 100%, 50%));
-  c-307: hue(hsl(-307%, 100%, 50%));
-  c-306: hue(hsl(-306%, 100%, 50%));
-  c-305: hue(hsl(-305%, 100%, 50%));
-  c-304: hue(hsl(-304%, 100%, 50%));
-  c-303: hue(hsl(-303%, 100%, 50%));
-  c-302: hue(hsl(-302%, 100%, 50%));
-  c-301: hue(hsl(-301%, 100%, 50%));
-  c-300: hue(hsl(-300%, 100%, 50%));
-  c-299: hue(hsl(-299%, 100%, 50%));
-  c-298: hue(hsl(-298%, 100%, 50%));
-  c-297: hue(hsl(-297%, 100%, 50%));
-  c-296: hue(hsl(-296%, 100%, 50%));
-  c-295: hue(hsl(-295%, 100%, 50%));
-  c-294: hue(hsl(-294%, 100%, 50%));
-  c-293: hue(hsl(-293%, 100%, 50%));
-  c-292: hue(hsl(-292%, 100%, 50%));
-  c-291: hue(hsl(-291%, 100%, 50%));
-  c-290: hue(hsl(-290%, 100%, 50%));
-  c-289: hue(hsl(-289%, 100%, 50%));
-  c-288: hue(hsl(-288%, 100%, 50%));
-  c-287: hue(hsl(-287%, 100%, 50%));
-  c-286: hue(hsl(-286%, 100%, 50%));
-  c-285: hue(hsl(-285%, 100%, 50%));
-  c-284: hue(hsl(-284%, 100%, 50%));
-  c-283: hue(hsl(-283%, 100%, 50%));
-  c-282: hue(hsl(-282%, 100%, 50%));
-  c-281: hue(hsl(-281%, 100%, 50%));
-  c-280: hue(hsl(-280%, 100%, 50%));
-  c-279: hue(hsl(-279%, 100%, 50%));
-  c-278: hue(hsl(-278%, 100%, 50%));
-  c-277: hue(hsl(-277%, 100%, 50%));
-  c-276: hue(hsl(-276%, 100%, 50%));
-  c-275: hue(hsl(-275%, 100%, 50%));
-  c-274: hue(hsl(-274%, 100%, 50%));
-  c-273: hue(hsl(-273%, 100%, 50%));
-  c-272: hue(hsl(-272%, 100%, 50%));
-  c-271: hue(hsl(-271%, 100%, 50%));
-  c-270: hue(hsl(-270%, 100%, 50%));
-  c-269: hue(hsl(-269%, 100%, 50%));
-  c-268: hue(hsl(-268%, 100%, 50%));
-  c-267: hue(hsl(-267%, 100%, 50%));
-  c-266: hue(hsl(-266%, 100%, 50%));
-  c-265: hue(hsl(-265%, 100%, 50%));
-  c-264: hue(hsl(-264%, 100%, 50%));
-  c-263: hue(hsl(-263%, 100%, 50%));
-  c-262: hue(hsl(-262%, 100%, 50%));
-  c-261: hue(hsl(-261%, 100%, 50%));
-  c-260: hue(hsl(-260%, 100%, 50%));
-  c-259: hue(hsl(-259%, 100%, 50%));
-  c-258: hue(hsl(-258%, 100%, 50%));
-  c-257: hue(hsl(-257%, 100%, 50%));
-  c-256: hue(hsl(-256%, 100%, 50%));
-  c-255: hue(hsl(-255%, 100%, 50%));
-  c-254: hue(hsl(-254%, 100%, 50%));
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-  c164: hue(hsl(164%, 100%, 50%));
-  c165: hue(hsl(165%, 100%, 50%));
-  c166: hue(hsl(166%, 100%, 50%));
-  c167: hue(hsl(167%, 100%, 50%));
-  c168: hue(hsl(168%, 100%, 50%));
-  c169: hue(hsl(169%, 100%, 50%));
-  c170: hue(hsl(170%, 100%, 50%));
-  c171: hue(hsl(171%, 100%, 50%));
-  c172: hue(hsl(172%, 100%, 50%));
-  c173: hue(hsl(173%, 100%, 50%));
-  c174: hue(hsl(174%, 100%, 50%));
-  c175: hue(hsl(175%, 100%, 50%));
-  c176: hue(hsl(176%, 100%, 50%));
-  c177: hue(hsl(177%, 100%, 50%));
-  c178: hue(hsl(178%, 100%, 50%));
-  c179: hue(hsl(179%, 100%, 50%));
-  c180: hue(hsl(180%, 100%, 50%));
-  c181: hue(hsl(181%, 100%, 50%));
-  c182: hue(hsl(182%, 100%, 50%));
-  c183: hue(hsl(183%, 100%, 50%));
-  c184: hue(hsl(184%, 100%, 50%));
-  c185: hue(hsl(185%, 100%, 50%));
-  c186: hue(hsl(186%, 100%, 50%));
-  c187: hue(hsl(187%, 100%, 50%));
-  c188: hue(hsl(188%, 100%, 50%));
-  c189: hue(hsl(189%, 100%, 50%));
-  c190: hue(hsl(190%, 100%, 50%));
-  c191: hue(hsl(191%, 100%, 50%));
-  c192: hue(hsl(192%, 100%, 50%));
-  c193: hue(hsl(193%, 100%, 50%));
-  c194: hue(hsl(194%, 100%, 50%));
-  c195: hue(hsl(195%, 100%, 50%));
-  c196: hue(hsl(196%, 100%, 50%));
-  c197: hue(hsl(197%, 100%, 50%));
-  c198: hue(hsl(198%, 100%, 50%));
-  c199: hue(hsl(199%, 100%, 50%));
-  c200: hue(hsl(200%, 100%, 50%));
-  c201: hue(hsl(201%, 100%, 50%));
-  c202: hue(hsl(202%, 100%, 50%));
-  c203: hue(hsl(203%, 100%, 50%));
-  c204: hue(hsl(204%, 100%, 50%));
-  c205: hue(hsl(205%, 100%, 50%));
-  c206: hue(hsl(206%, 100%, 50%));
-  c207: hue(hsl(207%, 100%, 50%));
-  c208: hue(hsl(208%, 100%, 50%));
-  c209: hue(hsl(209%, 100%, 50%));
-  c210: hue(hsl(210%, 100%, 50%));
-  c211: hue(hsl(211%, 100%, 50%));
-  c212: hue(hsl(212%, 100%, 50%));
-  c213: hue(hsl(213%, 100%, 50%));
-  c214: hue(hsl(214%, 100%, 50%));
-  c215: hue(hsl(215%, 100%, 50%));
-  c216: hue(hsl(216%, 100%, 50%));
-  c217: hue(hsl(217%, 100%, 50%));
-  c218: hue(hsl(218%, 100%, 50%));
-  c219: hue(hsl(219%, 100%, 50%));
-  c220: hue(hsl(220%, 100%, 50%));
-  c221: hue(hsl(221%, 100%, 50%));
-  c222: hue(hsl(222%, 100%, 50%));
-  c223: hue(hsl(223%, 100%, 50%));
-  c224: hue(hsl(224%, 100%, 50%));
-  c225: hue(hsl(225%, 100%, 50%));
-  c226: hue(hsl(226%, 100%, 50%));
-  c227: hue(hsl(227%, 100%, 50%));
-  c228: hue(hsl(228%, 100%, 50%));
-  c229: hue(hsl(229%, 100%, 50%));
-  c230: hue(hsl(230%, 100%, 50%));
-  c231: hue(hsl(231%, 100%, 50%));
-  c232: hue(hsl(232%, 100%, 50%));
-  c233: hue(hsl(233%, 100%, 50%));
-  c234: hue(hsl(234%, 100%, 50%));
-  c235: hue(hsl(235%, 100%, 50%));
-  c236: hue(hsl(236%, 100%, 50%));
-  c237: hue(hsl(237%, 100%, 50%));
-  c238: hue(hsl(238%, 100%, 50%));
-  c239: hue(hsl(239%, 100%, 50%));
-  c240: hue(hsl(240%, 100%, 50%));
-  c241: hue(hsl(241%, 100%, 50%));
-  c242: hue(hsl(242%, 100%, 50%));
-  c243: hue(hsl(243%, 100%, 50%));
-  c244: hue(hsl(244%, 100%, 50%));
-  c245: hue(hsl(245%, 100%, 50%));
-  c246: hue(hsl(246%, 100%, 50%));
-  c247: hue(hsl(247%, 100%, 50%));
-  c248: hue(hsl(248%, 100%, 50%));
-  c249: hue(hsl(249%, 100%, 50%));
-  c250: hue(hsl(250%, 100%, 50%));
-  c251: hue(hsl(251%, 100%, 50%));
-  c252: hue(hsl(252%, 100%, 50%));
-  c253: hue(hsl(253%, 100%, 50%));
-  c254: hue(hsl(254%, 100%, 50%));
-  c255: hue(hsl(255%, 100%, 50%));
-  c256: hue(hsl(256%, 100%, 50%));
-  c257: hue(hsl(257%, 100%, 50%));
-  c258: hue(hsl(258%, 100%, 50%));
-  c259: hue(hsl(259%, 100%, 50%));
-  c260: hue(hsl(260%, 100%, 50%));
-  c261: hue(hsl(261%, 100%, 50%));
-  c262: hue(hsl(262%, 100%, 50%));
-  c263: hue(hsl(263%, 100%, 50%));
-  c264: hue(hsl(264%, 100%, 50%));
-  c265: hue(hsl(265%, 100%, 50%));
-  c266: hue(hsl(266%, 100%, 50%));
-  c267: hue(hsl(267%, 100%, 50%));
-  c268: hue(hsl(268%, 100%, 50%));
-  c269: hue(hsl(269%, 100%, 50%));
-  c270: hue(hsl(270%, 100%, 50%));
-  c271: hue(hsl(271%, 100%, 50%));
-  c272: hue(hsl(272%, 100%, 50%));
-  c273: hue(hsl(273%, 100%, 50%));
-  c274: hue(hsl(274%, 100%, 50%));
-  c275: hue(hsl(275%, 100%, 50%));
-  c276: hue(hsl(276%, 100%, 50%));
-  c277: hue(hsl(277%, 100%, 50%));
-  c278: hue(hsl(278%, 100%, 50%));
-  c279: hue(hsl(279%, 100%, 50%));
-  c280: hue(hsl(280%, 100%, 50%));
-  c281: hue(hsl(281%, 100%, 50%));
-  c282: hue(hsl(282%, 100%, 50%));
-  c283: hue(hsl(283%, 100%, 50%));
-  c284: hue(hsl(284%, 100%, 50%));
-  c285: hue(hsl(285%, 100%, 50%));
-  c286: hue(hsl(286%, 100%, 50%));
-  c287: hue(hsl(287%, 100%, 50%));
-  c288: hue(hsl(288%, 100%, 50%));
-  c289: hue(hsl(289%, 100%, 50%));
-  c290: hue(hsl(290%, 100%, 50%));
-  c291: hue(hsl(291%, 100%, 50%));
-  c292: hue(hsl(292%, 100%, 50%));
-  c293: hue(hsl(293%, 100%, 50%));
-  c294: hue(hsl(294%, 100%, 50%));
-  c295: hue(hsl(295%, 100%, 50%));
-  c296: hue(hsl(296%, 100%, 50%));
-  c297: hue(hsl(297%, 100%, 50%));
-  c298: hue(hsl(298%, 100%, 50%));
-  c299: hue(hsl(299%, 100%, 50%));
-  c300: hue(hsl(300%, 100%, 50%));
-  c301: hue(hsl(301%, 100%, 50%));
-  c302: hue(hsl(302%, 100%, 50%));
-  c303: hue(hsl(303%, 100%, 50%));
-  c304: hue(hsl(304%, 100%, 50%));
-  c305: hue(hsl(305%, 100%, 50%));
-  c306: hue(hsl(306%, 100%, 50%));
-  c307: hue(hsl(307%, 100%, 50%));
-  c308: hue(hsl(308%, 100%, 50%));
-  c309: hue(hsl(309%, 100%, 50%));
-  c310: hue(hsl(310%, 100%, 50%));
-  c311: hue(hsl(311%, 100%, 50%));
-  c312: hue(hsl(312%, 100%, 50%));
-  c313: hue(hsl(313%, 100%, 50%));
-  c314: hue(hsl(314%, 100%, 50%));
-  c315: hue(hsl(315%, 100%, 50%));
-  c316: hue(hsl(316%, 100%, 50%));
-  c317: hue(hsl(317%, 100%, 50%));
-  c318: hue(hsl(318%, 100%, 50%));
-  c319: hue(hsl(319%, 100%, 50%));
-  c320: hue(hsl(320%, 100%, 50%));
-  c321: hue(hsl(321%, 100%, 50%));
-  c322: hue(hsl(322%, 100%, 50%));
-  c323: hue(hsl(323%, 100%, 50%));
-  c324: hue(hsl(324%, 100%, 50%));
-  c325: hue(hsl(325%, 100%, 50%));
-  c326: hue(hsl(326%, 100%, 50%));
-  c327: hue(hsl(327%, 100%, 50%));
-  c328: hue(hsl(328%, 100%, 50%));
-  c329: hue(hsl(329%, 100%, 50%));
-  c330: hue(hsl(330%, 100%, 50%));
-  c331: hue(hsl(331%, 100%, 50%));
-  c332: hue(hsl(332%, 100%, 50%));
-  c333: hue(hsl(333%, 100%, 50%));
-  c334: hue(hsl(334%, 100%, 50%));
-  c335: hue(hsl(335%, 100%, 50%));
-  c336: hue(hsl(336%, 100%, 50%));
-  c337: hue(hsl(337%, 100%, 50%));
-  c338: hue(hsl(338%, 100%, 50%));
-  c339: hue(hsl(339%, 100%, 50%));
-  c340: hue(hsl(340%, 100%, 50%));
-  c341: hue(hsl(341%, 100%, 50%));
-  c342: hue(hsl(342%, 100%, 50%));
-  c343: hue(hsl(343%, 100%, 50%));
-  c344: hue(hsl(344%, 100%, 50%));
-  c345: hue(hsl(345%, 100%, 50%));
-  c346: hue(hsl(346%, 100%, 50%));
-  c347: hue(hsl(347%, 100%, 50%));
-  c348: hue(hsl(348%, 100%, 50%));
-  c349: hue(hsl(349%, 100%, 50%));
-  c350: hue(hsl(350%, 100%, 50%));
-  c351: hue(hsl(351%, 100%, 50%));
-  c352: hue(hsl(352%, 100%, 50%));
-  c353: hue(hsl(353%, 100%, 50%));
-  c354: hue(hsl(354%, 100%, 50%));
-  c355: hue(hsl(355%, 100%, 50%));
-  c356: hue(hsl(356%, 100%, 50%));
-  c357: hue(hsl(357%, 100%, 50%));
-  c358: hue(hsl(358%, 100%, 50%));
-  c359: hue(hsl(359%, 100%, 50%));
-  c360: hue(hsl(360%, 100%, 50%));
-  c361: hue(hsl(361%, 100%, 50%));
-}
-
-<===> output.css
-foo {
-  c-361: 359deg;
-  c-360: 0deg;
-  c-359: 1deg;
-  c-358: 2deg;
-  c-357: 3deg;
-  c-356: 4deg;
-  c-355: 5deg;
-  c-354: 6deg;
-  c-353: 7deg;
-  c-352: 8deg;
-  c-351: 9deg;
-  c-350: 10deg;
-  c-349: 11deg;
-  c-348: 12deg;
-  c-347: 13deg;
-  c-346: 14deg;
-  c-345: 15deg;
-  c-344: 16deg;
-  c-343: 17deg;
-  c-342: 18deg;
-  c-341: 19deg;
-  c-340: 20deg;
-  c-339: 21deg;
-  c-338: 22deg;
-  c-337: 23deg;
-  c-336: 24deg;
-  c-335: 25deg;
-  c-334: 26deg;
-  c-333: 27deg;
-  c-332: 28deg;
-  c-331: 29deg;
-  c-330: 30deg;
-  c-329: 31deg;
-  c-328: 32deg;
-  c-327: 33deg;
-  c-326: 34deg;
-  c-325: 35deg;
-  c-324: 36deg;
-  c-323: 37deg;
-  c-322: 38deg;
-  c-321: 39deg;
-  c-320: 40deg;
-  c-319: 41deg;
-  c-318: 42deg;
-  c-317: 43deg;
-  c-316: 44deg;
-  c-315: 45deg;
-  c-314: 46deg;
-  c-313: 47deg;
-  c-312: 48deg;
-  c-311: 49deg;
-  c-310: 50deg;
-  c-309: 51deg;
-  c-308: 52deg;
-  c-307: 53deg;
-  c-306: 54deg;
-  c-305: 55deg;
-  c-304: 56deg;
-  c-303: 57deg;
-  c-302: 58deg;
-  c-301: 59deg;
-  c-300: 60deg;
-  c-299: 61deg;
-  c-298: 62deg;
-  c-297: 63deg;
-  c-296: 64deg;
-  c-295: 65deg;
-  c-294: 66deg;
-  c-293: 67deg;
-  c-292: 68deg;
-  c-291: 69deg;
-  c-290: 70deg;
-  c-289: 71deg;
-  c-288: 72deg;
-  c-287: 73deg;
-  c-286: 74deg;
-  c-285: 75deg;
-  c-284: 76deg;
-  c-283: 77deg;
-  c-282: 78deg;
-  c-281: 79deg;
-  c-280: 80deg;
-  c-279: 81deg;
-  c-278: 82deg;
-  c-277: 83deg;
-  c-276: 84deg;
-  c-275: 85deg;
-  c-274: 86deg;
-  c-273: 87deg;
-  c-272: 88deg;
-  c-271: 89deg;
-  c-270: 90deg;
-  c-269: 91deg;
-  c-268: 92deg;
-  c-267: 93deg;
-  c-266: 94deg;
-  c-265: 95deg;
-  c-264: 96deg;
-  c-263: 97deg;
-  c-262: 98deg;
-  c-261: 99deg;
-  c-260: 100deg;
-  c-259: 101deg;
-  c-258: 102deg;
-  c-257: 103deg;
-  c-256: 104deg;
-  c-255: 105deg;
-  c-254: 106deg;
-  c-253: 107deg;
-  c-252: 108deg;
-  c-251: 109deg;
-  c-250: 110deg;
-  c-249: 111deg;
-  c-248: 112deg;
-  c-247: 113deg;
-  c-246: 114deg;
-  c-245: 115deg;
-  c-244: 116deg;
-  c-243: 117deg;
-  c-242: 118deg;
-  c-241: 119deg;
-  c-240: 120deg;
-  c-239: 121deg;
-  c-238: 122deg;
-  c-237: 123deg;
-  c-236: 124deg;
-  c-235: 125deg;
-  c-234: 126deg;
-  c-233: 127deg;
-  c-232: 128deg;
-  c-231: 129deg;
-  c-230: 130deg;
-  c-229: 131deg;
-  c-228: 132deg;
-  c-227: 133deg;
-  c-226: 134deg;
-  c-225: 135deg;
-  c-224: 136deg;
-  c-223: 137deg;
-  c-222: 138deg;
-  c-221: 139deg;
-  c-220: 140deg;
-  c-219: 141deg;
-  c-218: 142deg;
-  c-217: 143deg;
-  c-216: 144deg;
-  c-215: 145deg;
-  c-214: 146deg;
-  c-213: 147deg;
-  c-212: 148deg;
-  c-211: 149deg;
-  c-210: 150deg;
-  c-209: 151deg;
-  c-208: 152deg;
-  c-207: 153deg;
-  c-206: 154deg;
-  c-205: 155deg;
-  c-204: 156deg;
-  c-203: 157deg;
-  c-202: 158deg;
-  c-201: 159deg;
-  c-200: 160deg;
-  c-199: 161deg;
-  c-198: 162deg;
-  c-197: 163deg;
-  c-196: 164deg;
-  c-195: 165deg;
-  c-194: 166deg;
-  c-193: 167deg;
-  c-192: 168deg;
-  c-191: 169deg;
-  c-190: 170deg;
-  c-189: 171deg;
-  c-188: 172deg;
-  c-187: 173deg;
-  c-186: 174deg;
-  c-185: 175deg;
-  c-184: 176deg;
-  c-183: 177deg;
-  c-182: 178deg;
-  c-181: 179deg;
-  c-180: 180deg;
-  c-179: 181deg;
-  c-178: 182deg;
-  c-177: 183deg;
-  c-176: 184deg;
-  c-175: 185deg;
-  c-174: 186deg;
-  c-173: 187deg;
-  c-172: 188deg;
-  c-171: 189deg;
-  c-170: 190deg;
-  c-169: 191deg;
-  c-168: 192deg;
-  c-167: 193deg;
-  c-166: 194deg;
-  c-165: 195deg;
-  c-164: 196deg;
-  c-163: 197deg;
-  c-162: 198deg;
-  c-161: 199deg;
-  c-160: 200deg;
-  c-159: 201deg;
-  c-158: 202deg;
-  c-157: 203deg;
-  c-156: 204deg;
-  c-155: 205deg;
-  c-154: 206deg;
-  c-153: 207deg;
-  c-152: 208deg;
-  c-151: 209deg;
-  c-150: 210deg;
-  c-149: 211deg;
-  c-148: 212deg;
-  c-147: 213deg;
-  c-146: 214deg;
-  c-145: 215deg;
-  c-144: 216deg;
-  c-143: 217deg;
-  c-142: 218deg;
-  c-141: 219deg;
-  c-140: 220deg;
-  c-139: 221deg;
-  c-138: 222deg;
-  c-137: 223deg;
-  c-136: 224deg;
-  c-135: 225deg;
-  c-134: 226deg;
-  c-133: 227deg;
-  c-132: 228deg;
-  c-131: 229deg;
-  c-130: 230deg;
-  c-129: 231deg;
-  c-128: 232deg;
-  c-127: 233deg;
-  c-126: 234deg;
-  c-125: 235deg;
-  c-124: 236deg;
-  c-123: 237deg;
-  c-122: 238deg;
-  c-121: 239deg;
-  c-120: 240deg;
-  c-119: 241deg;
-  c-118: 242deg;
-  c-117: 243deg;
-  c-116: 244deg;
-  c-115: 245deg;
-  c-114: 246deg;
-  c-113: 247deg;
-  c-112: 248deg;
-  c-111: 249deg;
-  c-110: 250deg;
-  c-109: 251deg;
-  c-108: 252deg;
-  c-107: 253deg;
-  c-106: 254deg;
-  c-105: 255deg;
-  c-104: 256deg;
-  c-103: 257deg;
-  c-102: 258deg;
-  c-101: 259deg;
-  c-100: 260deg;
-  c-99: 261deg;
-  c-98: 262deg;
-  c-97: 263deg;
-  c-96: 264deg;
-  c-95: 265deg;
-  c-94: 266deg;
-  c-93: 267deg;
-  c-92: 268deg;
-  c-91: 269deg;
-  c-90: 270deg;
-  c-89: 271deg;
-  c-88: 272deg;
-  c-87: 273deg;
-  c-86: 274deg;
-  c-85: 275deg;
-  c-84: 276deg;
-  c-83: 277deg;
-  c-82: 278deg;
-  c-81: 279deg;
-  c-80: 280deg;
-  c-79: 281deg;
-  c-78: 282deg;
-  c-77: 283deg;
-  c-76: 284deg;
-  c-75: 285deg;
-  c-74: 286deg;
-  c-73: 287deg;
-  c-72: 288deg;
-  c-71: 289deg;
-  c-70: 290deg;
-  c-69: 291deg;
-  c-68: 292deg;
-  c-67: 293deg;
-  c-66: 294deg;
-  c-65: 295deg;
-  c-64: 296deg;
-  c-63: 297deg;
-  c-62: 298deg;
-  c-61: 299deg;
-  c-60: 300deg;
-  c-59: 301deg;
-  c-58: 302deg;
-  c-57: 303deg;
-  c-56: 304deg;
-  c-55: 305deg;
-  c-54: 306deg;
-  c-53: 307deg;
-  c-52: 308deg;
-  c-51: 309deg;
-  c-50: 310deg;
-  c-49: 311deg;
-  c-48: 312deg;
-  c-47: 313deg;
-  c-46: 314deg;
-  c-45: 315deg;
-  c-44: 316deg;
-  c-43: 317deg;
-  c-42: 318deg;
-  c-41: 319deg;
-  c-40: 320deg;
-  c-39: 321deg;
-  c-38: 322deg;
-  c-37: 323deg;
-  c-36: 324deg;
-  c-35: 325deg;
-  c-34: 326deg;
-  c-33: 327deg;
-  c-32: 328deg;
-  c-31: 329deg;
-  c-30: 330deg;
-  c-29: 331deg;
-  c-28: 332deg;
-  c-27: 333deg;
-  c-26: 334deg;
-  c-25: 335deg;
-  c-24: 336deg;
-  c-23: 337deg;
-  c-22: 338deg;
-  c-21: 339deg;
-  c-20: 340deg;
-  c-19: 341deg;
-  c-18: 342deg;
-  c-17: 343deg;
-  c-16: 344deg;
-  c-15: 345deg;
-  c-14: 346deg;
-  c-13: 347deg;
-  c-12: 348deg;
-  c-11: 349deg;
-  c-10: 350deg;
-  c-9: 351deg;
-  c-8: 352deg;
-  c-7: 353deg;
-  c-6: 354deg;
-  c-5: 355deg;
-  c-4: 356deg;
-  c-3: 357deg;
-  c-2: 358deg;
-  c-1: 359deg;
-  c0: 0deg;
-  c1: 1deg;
-  c2: 2deg;
-  c3: 3deg;
-  c4: 4deg;
-  c5: 5deg;
-  c6: 6deg;
-  c7: 7deg;
-  c8: 8deg;
-  c9: 9deg;
-  c10: 10deg;
-  c11: 11deg;
-  c12: 12deg;
-  c13: 13deg;
-  c14: 14deg;
-  c15: 15deg;
-  c16: 16deg;
-  c17: 17deg;
-  c18: 18deg;
-  c19: 19deg;
-  c20: 20deg;
-  c21: 21deg;
-  c22: 22deg;
-  c23: 23deg;
-  c24: 24deg;
-  c25: 25deg;
-  c26: 26deg;
-  c27: 27deg;
-  c28: 28deg;
-  c29: 29deg;
-  c30: 30deg;
-  c31: 31deg;
-  c32: 32deg;
-  c33: 33deg;
-  c34: 34deg;
-  c35: 35deg;
-  c36: 36deg;
-  c37: 37deg;
-  c38: 38deg;
-  c39: 39deg;
-  c40: 40deg;
-  c41: 41deg;
-  c42: 42deg;
-  c43: 43deg;
-  c44: 44deg;
-  c45: 45deg;
-  c46: 46deg;
-  c47: 47deg;
-  c48: 48deg;
-  c49: 49deg;
-  c50: 50deg;
-  c51: 51deg;
-  c52: 52deg;
-  c53: 53deg;
-  c54: 54deg;
-  c55: 55deg;
-  c56: 56deg;
-  c57: 57deg;
-  c58: 58deg;
-  c59: 59deg;
-  c60: 60deg;
-  c61: 61deg;
-  c62: 62deg;
-  c63: 63deg;
-  c64: 64deg;
-  c65: 65deg;
-  c66: 66deg;
-  c67: 67deg;
-  c68: 68deg;
-  c69: 69deg;
-  c70: 70deg;
-  c71: 71deg;
-  c72: 72deg;
-  c73: 73deg;
-  c74: 74deg;
-  c75: 75deg;
-  c76: 76deg;
-  c77: 77deg;
-  c78: 78deg;
-  c79: 79deg;
-  c80: 80deg;
-  c81: 81deg;
-  c82: 82deg;
-  c83: 83deg;
-  c84: 84deg;
-  c85: 85deg;
-  c86: 86deg;
-  c87: 87deg;
-  c88: 88deg;
-  c89: 89deg;
-  c90: 90deg;
-  c91: 91deg;
-  c92: 92deg;
-  c93: 93deg;
-  c94: 94deg;
-  c95: 95deg;
-  c96: 96deg;
-  c97: 97deg;
-  c98: 98deg;
-  c99: 99deg;
-  c100: 100deg;
-  c101: 101deg;
-  c102: 102deg;
-  c103: 103deg;
-  c104: 104deg;
-  c105: 105deg;
-  c106: 106deg;
-  c107: 107deg;
-  c108: 108deg;
-  c109: 109deg;
-  c110: 110deg;
-  c111: 111deg;
-  c112: 112deg;
-  c113: 113deg;
-  c114: 114deg;
-  c115: 115deg;
-  c116: 116deg;
-  c117: 117deg;
-  c118: 118deg;
-  c119: 119deg;
-  c120: 120deg;
-  c121: 121deg;
-  c122: 122deg;
-  c123: 123deg;
-  c124: 124deg;
-  c125: 125deg;
-  c126: 126deg;
-  c127: 127deg;
-  c128: 128deg;
-  c129: 129deg;
-  c130: 130deg;
-  c131: 131deg;
-  c132: 132deg;
-  c133: 133deg;
-  c134: 134deg;
-  c135: 135deg;
-  c136: 136deg;
-  c137: 137deg;
-  c138: 138deg;
-  c139: 139deg;
-  c140: 140deg;
-  c141: 141deg;
-  c142: 142deg;
-  c143: 143deg;
-  c144: 144deg;
-  c145: 145deg;
-  c146: 146deg;
-  c147: 147deg;
-  c148: 148deg;
-  c149: 149deg;
-  c150: 150deg;
-  c151: 151deg;
-  c152: 152deg;
-  c153: 153deg;
-  c154: 154deg;
-  c155: 155deg;
-  c156: 156deg;
-  c157: 157deg;
-  c158: 158deg;
-  c159: 159deg;
-  c160: 160deg;
-  c161: 161deg;
-  c162: 162deg;
-  c163: 163deg;
-  c164: 164deg;
-  c165: 165deg;
-  c166: 166deg;
-  c167: 167deg;
-  c168: 168deg;
-  c169: 169deg;
-  c170: 170deg;
-  c171: 171deg;
-  c172: 172deg;
-  c173: 173deg;
-  c174: 174deg;
-  c175: 175deg;
-  c176: 176deg;
-  c177: 177deg;
-  c178: 178deg;
-  c179: 179deg;
-  c180: 180deg;
-  c181: 181deg;
-  c182: 182deg;
-  c183: 183deg;
-  c184: 184deg;
-  c185: 185deg;
-  c186: 186deg;
-  c187: 187deg;
-  c188: 188deg;
-  c189: 189deg;
-  c190: 190deg;
-  c191: 191deg;
-  c192: 192deg;
-  c193: 193deg;
-  c194: 194deg;
-  c195: 195deg;
-  c196: 196deg;
-  c197: 197deg;
-  c198: 198deg;
-  c199: 199deg;
-  c200: 200deg;
-  c201: 201deg;
-  c202: 202deg;
-  c203: 203deg;
-  c204: 204deg;
-  c205: 205deg;
-  c206: 206deg;
-  c207: 207deg;
-  c208: 208deg;
-  c209: 209deg;
-  c210: 210deg;
-  c211: 211deg;
-  c212: 212deg;
-  c213: 213deg;
-  c214: 214deg;
-  c215: 215deg;
-  c216: 216deg;
-  c217: 217deg;
-  c218: 218deg;
-  c219: 219deg;
-  c220: 220deg;
-  c221: 221deg;
-  c222: 222deg;
-  c223: 223deg;
-  c224: 224deg;
-  c225: 225deg;
-  c226: 226deg;
-  c227: 227deg;
-  c228: 228deg;
-  c229: 229deg;
-  c230: 230deg;
-  c231: 231deg;
-  c232: 232deg;
-  c233: 233deg;
-  c234: 234deg;
-  c235: 235deg;
-  c236: 236deg;
-  c237: 237deg;
-  c238: 238deg;
-  c239: 239deg;
-  c240: 240deg;
-  c241: 241deg;
-  c242: 242deg;
-  c243: 243deg;
-  c244: 244deg;
-  c245: 245deg;
-  c246: 246deg;
-  c247: 247deg;
-  c248: 248deg;
-  c249: 249deg;
-  c250: 250deg;
-  c251: 251deg;
-  c252: 252deg;
-  c253: 253deg;
-  c254: 254deg;
-  c255: 255deg;
-  c256: 256deg;
-  c257: 257deg;
-  c258: 258deg;
-  c259: 259deg;
-  c260: 260deg;
-  c261: 261deg;
-  c262: 262deg;
-  c263: 263deg;
-  c264: 264deg;
-  c265: 265deg;
-  c266: 266deg;
-  c267: 267deg;
-  c268: 268deg;
-  c269: 269deg;
-  c270: 270deg;
-  c271: 271deg;
-  c272: 272deg;
-  c273: 273deg;
-  c274: 274deg;
-  c275: 275deg;
-  c276: 276deg;
-  c277: 277deg;
-  c278: 278deg;
-  c279: 279deg;
-  c280: 280deg;
-  c281: 281deg;
-  c282: 282deg;
-  c283: 283deg;
-  c284: 284deg;
-  c285: 285deg;
-  c286: 286deg;
-  c287: 287deg;
-  c288: 288deg;
-  c289: 289deg;
-  c290: 290deg;
-  c291: 291deg;
-  c292: 292deg;
-  c293: 293deg;
-  c294: 294deg;
-  c295: 295deg;
-  c296: 296deg;
-  c297: 297deg;
-  c298: 298deg;
-  c299: 299deg;
-  c300: 300deg;
-  c301: 301deg;
-  c302: 302deg;
-  c303: 303deg;
-  c304: 304deg;
-  c305: 305deg;
-  c306: 306deg;
-  c307: 307deg;
-  c308: 308deg;
-  c309: 309deg;
-  c310: 310deg;
-  c311: 311deg;
-  c312: 312deg;
-  c313: 313deg;
-  c314: 314deg;
-  c315: 315deg;
-  c316: 316deg;
-  c317: 317deg;
-  c318: 318deg;
-  c319: 319deg;
-  c320: 320deg;
-  c321: 321deg;
-  c322: 322deg;
-  c323: 323deg;
-  c324: 324deg;
-  c325: 325deg;
-  c326: 326deg;
-  c327: 327deg;
-  c328: 328deg;
-  c329: 329deg;
-  c330: 330deg;
-  c331: 331deg;
-  c332: 332deg;
-  c333: 333deg;
-  c334: 334deg;
-  c335: 335deg;
-  c336: 336deg;
-  c337: 337deg;
-  c338: 338deg;
-  c339: 339deg;
-  c340: 340deg;
-  c341: 341deg;
-  c342: 342deg;
-  c343: 343deg;
-  c344: 344deg;
-  c345: 345deg;
-  c346: 346deg;
-  c347: 347deg;
-  c348: 348deg;
-  c349: 349deg;
-  c350: 350deg;
-  c351: 351deg;
-  c352: 352deg;
-  c353: 353deg;
-  c354: 354deg;
-  c355: 355deg;
-  c356: 356deg;
-  c357: 357deg;
-  c358: 358deg;
-  c359: 359deg;
-  c360: 0deg;
-  c361: 1deg;
-}
diff --git a/spec/libsass/color-functions/hsl/lighten.hrx b/spec/libsass/color-functions/hsl/lighten.hrx
deleted file mode 100644
index 903ffbe251..0000000000
--- a/spec/libsass/color-functions/hsl/lighten.hrx
+++ /dev/null
@@ -1,209 +0,0 @@
-<===> input.scss
-foo {
-  c0: lighten(black, 0%);
-  c1: lighten(black, 1%);
-  c2: lighten(black, 2%);
-  c3: lighten(black, 3%);
-  c4: lighten(black, 4%);
-  c5: lighten(black, 5%);
-  c6: lighten(black, 6%);
-  c7: lighten(black, 7%);
-  c8: lighten(black, 8%);
-  c9: lighten(black, 9%);
-  c10: lighten(black, 10%);
-  c11: lighten(black, 11%);
-  c12: lighten(black, 12%);
-  c13: lighten(black, 13%);
-  c14: lighten(black, 14%);
-  c15: lighten(black, 15%);
-  c16: lighten(black, 16%);
-  c17: lighten(black, 17%);
-  c18: lighten(black, 18%);
-  c19: lighten(black, 19%);
-  c20: lighten(black, 20%);
-  c21: lighten(black, 21%);
-  c22: lighten(black, 22%);
-  c23: lighten(black, 23%);
-  c24: lighten(black, 24%);
-  c25: lighten(black, 25%);
-  c26: lighten(black, 26%);
-  c27: lighten(black, 27%);
-  c28: lighten(black, 28%);
-  c29: lighten(black, 29%);
-  c30: lighten(black, 30%);
-  c31: lighten(black, 31%);
-  c32: lighten(black, 32%);
-  c33: lighten(black, 33%);
-  c34: lighten(black, 34%);
-  c35: lighten(black, 35%);
-  c36: lighten(black, 36%);
-  c37: lighten(black, 37%);
-  c38: lighten(black, 38%);
-  c39: lighten(black, 39%);
-  c40: lighten(black, 40%);
-  c41: lighten(black, 41%);
-  c42: lighten(black, 42%);
-  c43: lighten(black, 43%);
-  c44: lighten(black, 44%);
-  c45: lighten(black, 45%);
-  c46: lighten(black, 46%);
-  c47: lighten(black, 47%);
-  c48: lighten(black, 48%);
-  c49: lighten(black, 49%);
-  c50: lighten(black, 50%);
-  c51: lighten(black, 51%);
-  c52: lighten(black, 52%);
-  c53: lighten(black, 53%);
-  c54: lighten(black, 54%);
-  c55: lighten(black, 55%);
-  c56: lighten(black, 56%);
-  c57: lighten(black, 57%);
-  c58: lighten(black, 58%);
-  c59: lighten(black, 59%);
-  c60: lighten(black, 60%);
-  c61: lighten(black, 61%);
-  c62: lighten(black, 62%);
-  c63: lighten(black, 63%);
-  c64: lighten(black, 64%);
-  c65: lighten(black, 65%);
-  c66: lighten(black, 66%);
-  c67: lighten(black, 67%);
-  c68: lighten(black, 68%);
-  c69: lighten(black, 69%);
-  c70: lighten(black, 70%);
-  c71: lighten(black, 71%);
-  c72: lighten(black, 72%);
-  c73: lighten(black, 73%);
-  c74: lighten(black, 74%);
-  c75: lighten(black, 75%);
-  c76: lighten(black, 76%);
-  c77: lighten(black, 77%);
-  c78: lighten(black, 78%);
-  c79: lighten(black, 79%);
-  c80: lighten(black, 80%);
-  c81: lighten(black, 81%);
-  c82: lighten(black, 82%);
-  c83: lighten(black, 83%);
-  c84: lighten(black, 84%);
-  c85: lighten(black, 85%);
-  c86: lighten(black, 86%);
-  c87: lighten(black, 87%);
-  c88: lighten(black, 88%);
-  c89: lighten(black, 89%);
-  c90: lighten(black, 90%);
-  c91: lighten(black, 91%);
-  c92: lighten(black, 92%);
-  c93: lighten(black, 93%);
-  c94: lighten(black, 94%);
-  c95: lighten(black, 95%);
-  c96: lighten(black, 96%);
-  c97: lighten(black, 97%);
-  c98: lighten(black, 98%);
-  c99: lighten(black, 99%);
-  c100: lighten(black, 100%);
-}
-
-<===> output.css
-foo {
-  c0: black;
-  c1: #030303;
-  c2: #050505;
-  c3: #080808;
-  c4: #0a0a0a;
-  c5: #0d0d0d;
-  c6: #0f0f0f;
-  c7: #121212;
-  c8: #141414;
-  c9: #171717;
-  c10: #1a1a1a;
-  c11: #1c1c1c;
-  c12: #1f1f1f;
-  c13: #212121;
-  c14: #242424;
-  c15: #262626;
-  c16: #292929;
-  c17: #2b2b2b;
-  c18: #2e2e2e;
-  c19: #303030;
-  c20: #333333;
-  c21: #363636;
-  c22: #383838;
-  c23: #3b3b3b;
-  c24: #3d3d3d;
-  c25: #404040;
-  c26: #424242;
-  c27: #454545;
-  c28: #474747;
-  c29: #4a4a4a;
-  c30: #4d4d4d;
-  c31: #4f4f4f;
-  c32: #525252;
-  c33: #545454;
-  c34: #575757;
-  c35: #595959;
-  c36: #5c5c5c;
-  c37: #5e5e5e;
-  c38: #616161;
-  c39: #636363;
-  c40: #666666;
-  c41: dimgray;
-  c42: #6b6b6b;
-  c43: #6e6e6e;
-  c44: #707070;
-  c45: #737373;
-  c46: #757575;
-  c47: #787878;
-  c48: #7a7a7a;
-  c49: #7d7d7d;
-  c50: gray;
-  c51: #828282;
-  c52: #858585;
-  c53: #878787;
-  c54: #8a8a8a;
-  c55: #8c8c8c;
-  c56: #8f8f8f;
-  c57: #919191;
-  c58: #949494;
-  c59: #969696;
-  c60: #999999;
-  c61: #9c9c9c;
-  c62: #9e9e9e;
-  c63: #a1a1a1;
-  c64: #a3a3a3;
-  c65: #a6a6a6;
-  c66: #a8a8a8;
-  c67: #ababab;
-  c68: #adadad;
-  c69: #b0b0b0;
-  c70: #b3b3b3;
-  c71: #b5b5b5;
-  c72: #b8b8b8;
-  c73: #bababa;
-  c74: #bdbdbd;
-  c75: #bfbfbf;
-  c76: #c2c2c2;
-  c77: #c4c4c4;
-  c78: #c7c7c7;
-  c79: #c9c9c9;
-  c80: #cccccc;
-  c81: #cfcfcf;
-  c82: #d1d1d1;
-  c83: #d4d4d4;
-  c84: #d6d6d6;
-  c85: #d9d9d9;
-  c86: #dbdbdb;
-  c87: #dedede;
-  c88: #e0e0e0;
-  c89: #e3e3e3;
-  c90: #e6e6e6;
-  c91: #e8e8e8;
-  c92: #ebebeb;
-  c93: #ededed;
-  c94: #f0f0f0;
-  c95: #f2f2f2;
-  c96: whitesmoke;
-  c97: #f7f7f7;
-  c98: #fafafa;
-  c99: #fcfcfc;
-  c100: white;
-}
diff --git a/spec/libsass/color-functions/hsl/lightness.hrx b/spec/libsass/color-functions/hsl/lightness.hrx
deleted file mode 100644
index 345de0debe..0000000000
--- a/spec/libsass/color-functions/hsl/lightness.hrx
+++ /dev/null
@@ -1,209 +0,0 @@
-<===> input.scss
-foo {
-  c0: lightness(hsl(100, 50%, 0%));
-  c1: lightness(hsl(100, 50%, 1%));
-  c2: lightness(hsl(100, 50%, 2%));
-  c3: lightness(hsl(100, 50%, 3%));
-  c4: lightness(hsl(100, 50%, 4%));
-  c5: lightness(hsl(100, 50%, 5%));
-  c6: lightness(hsl(100, 50%, 6%));
-  c7: lightness(hsl(100, 50%, 7%));
-  c8: lightness(hsl(100, 50%, 8%));
-  c9: lightness(hsl(100, 50%, 9%));
-  c10: lightness(hsl(100, 50%, 10%));
-  c11: lightness(hsl(100, 50%, 11%));
-  c12: lightness(hsl(100, 50%, 12%));
-  c13: lightness(hsl(100, 50%, 13%));
-  c14: lightness(hsl(100, 50%, 14%));
-  c15: lightness(hsl(100, 50%, 15%));
-  c16: lightness(hsl(100, 50%, 16%));
-  c17: lightness(hsl(100, 50%, 17%));
-  c18: lightness(hsl(100, 50%, 18%));
-  c19: lightness(hsl(100, 50%, 19%));
-  c20: lightness(hsl(100, 50%, 20%));
-  c21: lightness(hsl(100, 50%, 21%));
-  c22: lightness(hsl(100, 50%, 22%));
-  c23: lightness(hsl(100, 50%, 23%));
-  c24: lightness(hsl(100, 50%, 24%));
-  c25: lightness(hsl(100, 50%, 25%));
-  c26: lightness(hsl(100, 50%, 26%));
-  c27: lightness(hsl(100, 50%, 27%));
-  c28: lightness(hsl(100, 50%, 28%));
-  c29: lightness(hsl(100, 50%, 29%));
-  c30: lightness(hsl(100, 50%, 30%));
-  c31: lightness(hsl(100, 50%, 31%));
-  c32: lightness(hsl(100, 50%, 32%));
-  c33: lightness(hsl(100, 50%, 33%));
-  c34: lightness(hsl(100, 50%, 34%));
-  c35: lightness(hsl(100, 50%, 35%));
-  c36: lightness(hsl(100, 50%, 36%));
-  c37: lightness(hsl(100, 50%, 37%));
-  c38: lightness(hsl(100, 50%, 38%));
-  c39: lightness(hsl(100, 50%, 39%));
-  c40: lightness(hsl(100, 50%, 40%));
-  c41: lightness(hsl(100, 50%, 41%));
-  c42: lightness(hsl(100, 50%, 42%));
-  c43: lightness(hsl(100, 50%, 43%));
-  c44: lightness(hsl(100, 50%, 44%));
-  c45: lightness(hsl(100, 50%, 45%));
-  c46: lightness(hsl(100, 50%, 46%));
-  c47: lightness(hsl(100, 50%, 47%));
-  c48: lightness(hsl(100, 50%, 48%));
-  c49: lightness(hsl(100, 50%, 49%));
-  c50: lightness(hsl(100, 50%, 50%));
-  c51: lightness(hsl(100, 50%, 51%));
-  c52: lightness(hsl(100, 50%, 52%));
-  c53: lightness(hsl(100, 50%, 53%));
-  c54: lightness(hsl(100, 50%, 54%));
-  c55: lightness(hsl(100, 50%, 55%));
-  c56: lightness(hsl(100, 50%, 56%));
-  c57: lightness(hsl(100, 50%, 57%));
-  c58: lightness(hsl(100, 50%, 58%));
-  c59: lightness(hsl(100, 50%, 59%));
-  c60: lightness(hsl(100, 50%, 60%));
-  c61: lightness(hsl(100, 50%, 61%));
-  c62: lightness(hsl(100, 50%, 62%));
-  c63: lightness(hsl(100, 50%, 63%));
-  c64: lightness(hsl(100, 50%, 64%));
-  c65: lightness(hsl(100, 50%, 65%));
-  c66: lightness(hsl(100, 50%, 66%));
-  c67: lightness(hsl(100, 50%, 67%));
-  c68: lightness(hsl(100, 50%, 68%));
-  c69: lightness(hsl(100, 50%, 69%));
-  c70: lightness(hsl(100, 50%, 70%));
-  c71: lightness(hsl(100, 50%, 71%));
-  c72: lightness(hsl(100, 50%, 72%));
-  c73: lightness(hsl(100, 50%, 73%));
-  c74: lightness(hsl(100, 50%, 74%));
-  c75: lightness(hsl(100, 50%, 75%));
-  c76: lightness(hsl(100, 50%, 76%));
-  c77: lightness(hsl(100, 50%, 77%));
-  c78: lightness(hsl(100, 50%, 78%));
-  c79: lightness(hsl(100, 50%, 79%));
-  c80: lightness(hsl(100, 50%, 80%));
-  c81: lightness(hsl(100, 50%, 81%));
-  c82: lightness(hsl(100, 50%, 82%));
-  c83: lightness(hsl(100, 50%, 83%));
-  c84: lightness(hsl(100, 50%, 84%));
-  c85: lightness(hsl(100, 50%, 85%));
-  c86: lightness(hsl(100, 50%, 86%));
-  c87: lightness(hsl(100, 50%, 87%));
-  c88: lightness(hsl(100, 50%, 88%));
-  c89: lightness(hsl(100, 50%, 89%));
-  c90: lightness(hsl(100, 50%, 90%));
-  c91: lightness(hsl(100, 50%, 91%));
-  c92: lightness(hsl(100, 50%, 92%));
-  c93: lightness(hsl(100, 50%, 93%));
-  c94: lightness(hsl(100, 50%, 94%));
-  c95: lightness(hsl(100, 50%, 95%));
-  c96: lightness(hsl(100, 50%, 96%));
-  c97: lightness(hsl(100, 50%, 97%));
-  c98: lightness(hsl(100, 50%, 98%));
-  c99: lightness(hsl(100, 50%, 99%));
-  c100: lightness(hsl(100, 50%, 100%));
-}
-
-<===> output.css
-foo {
-  c0: 0%;
-  c1: 1%;
-  c2: 2%;
-  c3: 3%;
-  c4: 4%;
-  c5: 5%;
-  c6: 6%;
-  c7: 7%;
-  c8: 8%;
-  c9: 9%;
-  c10: 10%;
-  c11: 11%;
-  c12: 12%;
-  c13: 13%;
-  c14: 14%;
-  c15: 15%;
-  c16: 16%;
-  c17: 17%;
-  c18: 18%;
-  c19: 19%;
-  c20: 20%;
-  c21: 21%;
-  c22: 22%;
-  c23: 23%;
-  c24: 24%;
-  c25: 25%;
-  c26: 26%;
-  c27: 27%;
-  c28: 28%;
-  c29: 29%;
-  c30: 30%;
-  c31: 31%;
-  c32: 32%;
-  c33: 33%;
-  c34: 34%;
-  c35: 35%;
-  c36: 36%;
-  c37: 37%;
-  c38: 38%;
-  c39: 39%;
-  c40: 40%;
-  c41: 41%;
-  c42: 42%;
-  c43: 43%;
-  c44: 44%;
-  c45: 45%;
-  c46: 46%;
-  c47: 47%;
-  c48: 48%;
-  c49: 49%;
-  c50: 50%;
-  c51: 51%;
-  c52: 52%;
-  c53: 53%;
-  c54: 54%;
-  c55: 55%;
-  c56: 56%;
-  c57: 57%;
-  c58: 58%;
-  c59: 59%;
-  c60: 60%;
-  c61: 61%;
-  c62: 62%;
-  c63: 63%;
-  c64: 64%;
-  c65: 65%;
-  c66: 66%;
-  c67: 67%;
-  c68: 68%;
-  c69: 69%;
-  c70: 70%;
-  c71: 71%;
-  c72: 72%;
-  c73: 73%;
-  c74: 74%;
-  c75: 75%;
-  c76: 76%;
-  c77: 77%;
-  c78: 78%;
-  c79: 79%;
-  c80: 80%;
-  c81: 81%;
-  c82: 82%;
-  c83: 83%;
-  c84: 84%;
-  c85: 85%;
-  c86: 86%;
-  c87: 87%;
-  c88: 88%;
-  c89: 89%;
-  c90: 90%;
-  c91: 91%;
-  c92: 92%;
-  c93: 93%;
-  c94: 94%;
-  c95: 95%;
-  c96: 96%;
-  c97: 97%;
-  c98: 98%;
-  c99: 99%;
-  c100: 100%;
-}
diff --git a/spec/libsass/color-functions/hsl/saturation.hrx b/spec/libsass/color-functions/hsl/saturation.hrx
deleted file mode 100644
index 320fe8865c..0000000000
--- a/spec/libsass/color-functions/hsl/saturation.hrx
+++ /dev/null
@@ -1,209 +0,0 @@
-<===> input.scss
-foo {
-  c0: saturation(hsl(100, 0%, 50%));
-  c1: saturation(hsl(100, 1%, 50%));
-  c2: saturation(hsl(100, 2%, 50%));
-  c3: saturation(hsl(100, 3%, 50%));
-  c4: saturation(hsl(100, 4%, 50%));
-  c5: saturation(hsl(100, 5%, 50%));
-  c6: saturation(hsl(100, 6%, 50%));
-  c7: saturation(hsl(100, 7%, 50%));
-  c8: saturation(hsl(100, 8%, 50%));
-  c9: saturation(hsl(100, 9%, 50%));
-  c10: saturation(hsl(100, 10%, 50%));
-  c11: saturation(hsl(100, 11%, 50%));
-  c12: saturation(hsl(100, 12%, 50%));
-  c13: saturation(hsl(100, 13%, 50%));
-  c14: saturation(hsl(100, 14%, 50%));
-  c15: saturation(hsl(100, 15%, 50%));
-  c16: saturation(hsl(100, 16%, 50%));
-  c17: saturation(hsl(100, 17%, 50%));
-  c18: saturation(hsl(100, 18%, 50%));
-  c19: saturation(hsl(100, 19%, 50%));
-  c20: saturation(hsl(100, 20%, 50%));
-  c21: saturation(hsl(100, 21%, 50%));
-  c22: saturation(hsl(100, 22%, 50%));
-  c23: saturation(hsl(100, 23%, 50%));
-  c24: saturation(hsl(100, 24%, 50%));
-  c25: saturation(hsl(100, 25%, 50%));
-  c26: saturation(hsl(100, 26%, 50%));
-  c27: saturation(hsl(100, 27%, 50%));
-  c28: saturation(hsl(100, 28%, 50%));
-  c29: saturation(hsl(100, 29%, 50%));
-  c30: saturation(hsl(100, 30%, 50%));
-  c31: saturation(hsl(100, 31%, 50%));
-  c32: saturation(hsl(100, 32%, 50%));
-  c33: saturation(hsl(100, 33%, 50%));
-  c34: saturation(hsl(100, 34%, 50%));
-  c35: saturation(hsl(100, 35%, 50%));
-  c36: saturation(hsl(100, 36%, 50%));
-  c37: saturation(hsl(100, 37%, 50%));
-  c38: saturation(hsl(100, 38%, 50%));
-  c39: saturation(hsl(100, 39%, 50%));
-  c40: saturation(hsl(100, 40%, 50%));
-  c41: saturation(hsl(100, 41%, 50%));
-  c42: saturation(hsl(100, 42%, 50%));
-  c43: saturation(hsl(100, 43%, 50%));
-  c44: saturation(hsl(100, 44%, 50%));
-  c45: saturation(hsl(100, 45%, 50%));
-  c46: saturation(hsl(100, 46%, 50%));
-  c47: saturation(hsl(100, 47%, 50%));
-  c48: saturation(hsl(100, 48%, 50%));
-  c49: saturation(hsl(100, 49%, 50%));
-  c50: saturation(hsl(100, 50%, 50%));
-  c51: saturation(hsl(100, 51%, 50%));
-  c52: saturation(hsl(100, 52%, 50%));
-  c53: saturation(hsl(100, 53%, 50%));
-  c54: saturation(hsl(100, 54%, 50%));
-  c55: saturation(hsl(100, 55%, 50%));
-  c56: saturation(hsl(100, 56%, 50%));
-  c57: saturation(hsl(100, 57%, 50%));
-  c58: saturation(hsl(100, 58%, 50%));
-  c59: saturation(hsl(100, 59%, 50%));
-  c60: saturation(hsl(100, 60%, 50%));
-  c61: saturation(hsl(100, 61%, 50%));
-  c62: saturation(hsl(100, 62%, 50%));
-  c63: saturation(hsl(100, 63%, 50%));
-  c64: saturation(hsl(100, 64%, 50%));
-  c65: saturation(hsl(100, 65%, 50%));
-  c66: saturation(hsl(100, 66%, 50%));
-  c67: saturation(hsl(100, 67%, 50%));
-  c68: saturation(hsl(100, 68%, 50%));
-  c69: saturation(hsl(100, 69%, 50%));
-  c70: saturation(hsl(100, 70%, 50%));
-  c71: saturation(hsl(100, 71%, 50%));
-  c72: saturation(hsl(100, 72%, 50%));
-  c73: saturation(hsl(100, 73%, 50%));
-  c74: saturation(hsl(100, 74%, 50%));
-  c75: saturation(hsl(100, 75%, 50%));
-  c76: saturation(hsl(100, 76%, 50%));
-  c77: saturation(hsl(100, 77%, 50%));
-  c78: saturation(hsl(100, 78%, 50%));
-  c79: saturation(hsl(100, 79%, 50%));
-  c80: saturation(hsl(100, 80%, 50%));
-  c81: saturation(hsl(100, 81%, 50%));
-  c82: saturation(hsl(100, 82%, 50%));
-  c83: saturation(hsl(100, 83%, 50%));
-  c84: saturation(hsl(100, 84%, 50%));
-  c85: saturation(hsl(100, 85%, 50%));
-  c86: saturation(hsl(100, 86%, 50%));
-  c87: saturation(hsl(100, 87%, 50%));
-  c88: saturation(hsl(100, 88%, 50%));
-  c89: saturation(hsl(100, 89%, 50%));
-  c90: saturation(hsl(100, 90%, 50%));
-  c91: saturation(hsl(100, 91%, 50%));
-  c92: saturation(hsl(100, 92%, 50%));
-  c93: saturation(hsl(100, 93%, 50%));
-  c94: saturation(hsl(100, 94%, 50%));
-  c95: saturation(hsl(100, 95%, 50%));
-  c96: saturation(hsl(100, 96%, 50%));
-  c97: saturation(hsl(100, 97%, 50%));
-  c98: saturation(hsl(100, 98%, 50%));
-  c99: saturation(hsl(100, 99%, 50%));
-  c100: saturation(hsl(100, 100%, 50%));
-}
-
-<===> output.css
-foo {
-  c0: 0%;
-  c1: 1%;
-  c2: 2%;
-  c3: 3%;
-  c4: 4%;
-  c5: 5%;
-  c6: 6%;
-  c7: 7%;
-  c8: 8%;
-  c9: 9%;
-  c10: 10%;
-  c11: 11%;
-  c12: 12%;
-  c13: 13%;
-  c14: 14%;
-  c15: 15%;
-  c16: 16%;
-  c17: 17%;
-  c18: 18%;
-  c19: 19%;
-  c20: 20%;
-  c21: 21%;
-  c22: 22%;
-  c23: 23%;
-  c24: 24%;
-  c25: 25%;
-  c26: 26%;
-  c27: 27%;
-  c28: 28%;
-  c29: 29%;
-  c30: 30%;
-  c31: 31%;
-  c32: 32%;
-  c33: 33%;
-  c34: 34%;
-  c35: 35%;
-  c36: 36%;
-  c37: 37%;
-  c38: 38%;
-  c39: 39%;
-  c40: 40%;
-  c41: 41%;
-  c42: 42%;
-  c43: 43%;
-  c44: 44%;
-  c45: 45%;
-  c46: 46%;
-  c47: 47%;
-  c48: 48%;
-  c49: 49%;
-  c50: 50%;
-  c51: 51%;
-  c52: 52%;
-  c53: 53%;
-  c54: 54%;
-  c55: 55%;
-  c56: 56%;
-  c57: 57%;
-  c58: 58%;
-  c59: 59%;
-  c60: 60%;
-  c61: 61%;
-  c62: 62%;
-  c63: 63%;
-  c64: 64%;
-  c65: 65%;
-  c66: 66%;
-  c67: 67%;
-  c68: 68%;
-  c69: 69%;
-  c70: 70%;
-  c71: 71%;
-  c72: 72%;
-  c73: 73%;
-  c74: 74%;
-  c75: 75%;
-  c76: 76%;
-  c77: 77%;
-  c78: 78%;
-  c79: 79%;
-  c80: 80%;
-  c81: 81%;
-  c82: 82%;
-  c83: 83%;
-  c84: 84%;
-  c85: 85%;
-  c86: 86%;
-  c87: 87%;
-  c88: 88%;
-  c89: 89%;
-  c90: 90%;
-  c91: 91%;
-  c92: 92%;
-  c93: 93%;
-  c94: 94%;
-  c95: 95%;
-  c96: 96%;
-  c97: 97%;
-  c98: 98%;
-  c99: 99%;
-  c100: 100%;
-}
diff --git a/spec/libsass/color-functions/opacity/fade-in.hrx b/spec/libsass/color-functions/opacity/fade-in.hrx
deleted file mode 100644
index 4419e65253..0000000000
--- a/spec/libsass/color-functions/opacity/fade-in.hrx
+++ /dev/null
@@ -1,29 +0,0 @@
-<===> input.scss
-foo {
-  c0: fade-in(rgba(0,0,0,0.0), 0.1);
-  c1: fade-in(rgba(0,0,0,0.1), 0.1);
-  c2: fade-in(rgba(0,0,0,0.2), 0.1);
-  c3: fade-in(rgba(0,0,0,0.3), 0.1);
-  c4: fade-in(rgba(0,0,0,0.4), 0.1);
-  c5: fade-in(rgba(0,0,0,0.5), 0.1);
-  c6: fade-in(rgba(0,0,0,0.6), 0.1);
-  c7: fade-in(rgba(0,0,0,0.7), 0.1);
-  c8: fade-in(rgba(0,0,0,0.8), 0.1);
-  c9: fade-in(rgba(0,0,0,0.9), 0.1);
-  c10: fade-in(rgba(0,0,0,1), 0.1);
-}
-
-<===> output.css
-foo {
-  c0: rgba(0, 0, 0, 0.1);
-  c1: rgba(0, 0, 0, 0.2);
-  c2: rgba(0, 0, 0, 0.3);
-  c3: rgba(0, 0, 0, 0.4);
-  c4: rgba(0, 0, 0, 0.5);
-  c5: rgba(0, 0, 0, 0.6);
-  c6: rgba(0, 0, 0, 0.7);
-  c7: rgba(0, 0, 0, 0.8);
-  c8: rgba(0, 0, 0, 0.9);
-  c9: black;
-  c10: black;
-}
diff --git a/spec/libsass/color-functions/opacity/fade-out.hrx b/spec/libsass/color-functions/opacity/fade-out.hrx
deleted file mode 100644
index 41690f7afb..0000000000
--- a/spec/libsass/color-functions/opacity/fade-out.hrx
+++ /dev/null
@@ -1,29 +0,0 @@
-<===> input.scss
-foo {
-  c0: fade-out(rgba(0,0,0,0.0), 0.1);
-  c1: fade-out(rgba(0,0,0,0.1), 0.1);
-  c2: fade-out(rgba(0,0,0,0.2), 0.1);
-  c3: fade-out(rgba(0,0,0,0.3), 0.1);
-  c4: fade-out(rgba(0,0,0,0.4), 0.1);
-  c5: fade-out(rgba(0,0,0,0.5), 0.1);
-  c6: fade-out(rgba(0,0,0,0.6), 0.1);
-  c7: fade-out(rgba(0,0,0,0.7), 0.1);
-  c8: fade-out(rgba(0,0,0,0.8), 0.1);
-  c9: fade-out(rgba(0,0,0,0.9), 0.1);
-  c10: fade-out(rgba(0,0,0,1), 0.1);
-}
-
-<===> output.css
-foo {
-  c0: rgba(0, 0, 0, 0);
-  c1: rgba(0, 0, 0, 0);
-  c2: rgba(0, 0, 0, 0.1);
-  c3: rgba(0, 0, 0, 0.2);
-  c4: rgba(0, 0, 0, 0.3);
-  c5: rgba(0, 0, 0, 0.4);
-  c6: rgba(0, 0, 0, 0.5);
-  c7: rgba(0, 0, 0, 0.6);
-  c8: rgba(0, 0, 0, 0.7);
-  c9: rgba(0, 0, 0, 0.8);
-  c10: rgba(0, 0, 0, 0.9);
-}
diff --git a/spec/libsass/color-functions/opacity/opacify.hrx b/spec/libsass/color-functions/opacity/opacify.hrx
deleted file mode 100644
index 8358759397..0000000000
--- a/spec/libsass/color-functions/opacity/opacify.hrx
+++ /dev/null
@@ -1,2 +0,0 @@
-<===> input.scss
-<===> output.css
diff --git a/spec/libsass/color-functions/opacity/opacity.hrx b/spec/libsass/color-functions/opacity/opacity.hrx
deleted file mode 100644
index c4768074a6..0000000000
--- a/spec/libsass/color-functions/opacity/opacity.hrx
+++ /dev/null
@@ -1,29 +0,0 @@
-<===> input.scss
-foo {
-  c0: opacify(rgba(0,0,0,0.0), 0.1);
-  c1: opacify(rgba(0,0,0,0.1), 0.1);
-  c2: opacify(rgba(0,0,0,0.2), 0.1);
-  c3: opacify(rgba(0,0,0,0.3), 0.1);
-  c4: opacify(rgba(0,0,0,0.4), 0.1);
-  c5: opacify(rgba(0,0,0,0.5), 0.1);
-  c6: opacify(rgba(0,0,0,0.6), 0.1);
-  c7: opacify(rgba(0,0,0,0.7), 0.1);
-  c8: opacify(rgba(0,0,0,0.8), 0.1);
-  c9: opacify(rgba(0,0,0,0.9), 0.1);
-  c10: opacify(rgba(0,0,0,1), 0.1);
-}
-
-<===> output.css
-foo {
-  c0: rgba(0, 0, 0, 0.1);
-  c1: rgba(0, 0, 0, 0.2);
-  c2: rgba(0, 0, 0, 0.3);
-  c3: rgba(0, 0, 0, 0.4);
-  c4: rgba(0, 0, 0, 0.5);
-  c5: rgba(0, 0, 0, 0.6);
-  c6: rgba(0, 0, 0, 0.7);
-  c7: rgba(0, 0, 0, 0.8);
-  c8: rgba(0, 0, 0, 0.9);
-  c9: black;
-  c10: black;
-}
diff --git a/spec/libsass/color-functions/opacity/transparentize.hrx b/spec/libsass/color-functions/opacity/transparentize.hrx
deleted file mode 100644
index 0d57d5169b..0000000000
--- a/spec/libsass/color-functions/opacity/transparentize.hrx
+++ /dev/null
@@ -1,29 +0,0 @@
-<===> input.scss
-foo {
-  c0: transparentize(rgba(0,0,0,0.0), 0.1);
-  c1: transparentize(rgba(0,0,0,0.1), 0.1);
-  c2: transparentize(rgba(0,0,0,0.2), 0.1);
-  c3: transparentize(rgba(0,0,0,0.3), 0.1);
-  c4: transparentize(rgba(0,0,0,0.4), 0.1);
-  c5: transparentize(rgba(0,0,0,0.5), 0.1);
-  c6: transparentize(rgba(0,0,0,0.6), 0.1);
-  c7: transparentize(rgba(0,0,0,0.7), 0.1);
-  c8: transparentize(rgba(0,0,0,0.8), 0.1);
-  c9: transparentize(rgba(0,0,0,0.9), 0.1);
-  c10: transparentize(rgba(0,0,0,1), 0.1);
-}
-
-<===> output.css
-foo {
-  c0: rgba(0, 0, 0, 0);
-  c1: rgba(0, 0, 0, 0);
-  c2: rgba(0, 0, 0, 0.1);
-  c3: rgba(0, 0, 0, 0.2);
-  c4: rgba(0, 0, 0, 0.3);
-  c5: rgba(0, 0, 0, 0.4);
-  c6: rgba(0, 0, 0, 0.5);
-  c7: rgba(0, 0, 0, 0.6);
-  c8: rgba(0, 0, 0, 0.7);
-  c9: rgba(0, 0, 0, 0.8);
-  c10: rgba(0, 0, 0, 0.9);
-}
diff --git a/spec/libsass/color-functions/rgb/blue.hrx b/spec/libsass/color-functions/rgb/blue.hrx
deleted file mode 100644
index 74ec9c4ad7..0000000000
--- a/spec/libsass/color-functions/rgb/blue.hrx
+++ /dev/null
@@ -1,523 +0,0 @@
-<===> input.scss
-foo {
-  c-1: blue(rgb(0,0,-1));
-  c0: blue(rgb(0,0,0));
-  c1: blue(rgb(0,0,1));
-  c2: blue(rgb(0,0,2));
-  c3: blue(rgb(0,0,3));
-  c4: blue(rgb(0,0,4));
-  c5: blue(rgb(0,0,5));
-  c6: blue(rgb(0,0,6));
-  c7: blue(rgb(0,0,7));
-  c8: blue(rgb(0,0,8));
-  c9: blue(rgb(0,0,9));
-  c10: blue(rgb(0,0,10));
-  c11: blue(rgb(0,0,11));
-  c12: blue(rgb(0,0,12));
-  c13: blue(rgb(0,0,13));
-  c14: blue(rgb(0,0,14));
-  c15: blue(rgb(0,0,15));
-  c16: blue(rgb(0,0,16));
-  c17: blue(rgb(0,0,17));
-  c18: blue(rgb(0,0,18));
-  c19: blue(rgb(0,0,19));
-  c20: blue(rgb(0,0,20));
-  c21: blue(rgb(0,0,21));
-  c22: blue(rgb(0,0,22));
-  c23: blue(rgb(0,0,23));
-  c24: blue(rgb(0,0,24));
-  c25: blue(rgb(0,0,25));
-  c26: blue(rgb(0,0,26));
-  c27: blue(rgb(0,0,27));
-  c28: blue(rgb(0,0,28));
-  c29: blue(rgb(0,0,29));
-  c30: blue(rgb(0,0,30));
-  c31: blue(rgb(0,0,31));
-  c32: blue(rgb(0,0,32));
-  c33: blue(rgb(0,0,33));
-  c34: blue(rgb(0,0,34));
-  c35: blue(rgb(0,0,35));
-  c36: blue(rgb(0,0,36));
-  c37: blue(rgb(0,0,37));
-  c38: blue(rgb(0,0,38));
-  c39: blue(rgb(0,0,39));
-  c40: blue(rgb(0,0,40));
-  c41: blue(rgb(0,0,41));
-  c42: blue(rgb(0,0,42));
-  c43: blue(rgb(0,0,43));
-  c44: blue(rgb(0,0,44));
-  c45: blue(rgb(0,0,45));
-  c46: blue(rgb(0,0,46));
-  c47: blue(rgb(0,0,47));
-  c48: blue(rgb(0,0,48));
-  c49: blue(rgb(0,0,49));
-  c50: blue(rgb(0,0,50));
-  c51: blue(rgb(0,0,51));
-  c52: blue(rgb(0,0,52));
-  c53: blue(rgb(0,0,53));
-  c54: blue(rgb(0,0,54));
-  c55: blue(rgb(0,0,55));
-  c56: blue(rgb(0,0,56));
-  c57: blue(rgb(0,0,57));
-  c58: blue(rgb(0,0,58));
-  c59: blue(rgb(0,0,59));
-  c60: blue(rgb(0,0,60));
-  c61: blue(rgb(0,0,61));
-  c62: blue(rgb(0,0,62));
-  c63: blue(rgb(0,0,63));
-  c64: blue(rgb(0,0,64));
-  c65: blue(rgb(0,0,65));
-  c66: blue(rgb(0,0,66));
-  c67: blue(rgb(0,0,67));
-  c68: blue(rgb(0,0,68));
-  c69: blue(rgb(0,0,69));
-  c70: blue(rgb(0,0,70));
-  c71: blue(rgb(0,0,71));
-  c72: blue(rgb(0,0,72));
-  c73: blue(rgb(0,0,73));
-  c74: blue(rgb(0,0,74));
-  c75: blue(rgb(0,0,75));
-  c76: blue(rgb(0,0,76));
-  c77: blue(rgb(0,0,77));
-  c78: blue(rgb(0,0,78));
-  c79: blue(rgb(0,0,79));
-  c80: blue(rgb(0,0,80));
-  c81: blue(rgb(0,0,81));
-  c82: blue(rgb(0,0,82));
-  c83: blue(rgb(0,0,83));
-  c84: blue(rgb(0,0,84));
-  c85: blue(rgb(0,0,85));
-  c86: blue(rgb(0,0,86));
-  c87: blue(rgb(0,0,87));
-  c88: blue(rgb(0,0,88));
-  c89: blue(rgb(0,0,89));
-  c90: blue(rgb(0,0,90));
-  c91: blue(rgb(0,0,91));
-  c92: blue(rgb(0,0,92));
-  c93: blue(rgb(0,0,93));
-  c94: blue(rgb(0,0,94));
-  c95: blue(rgb(0,0,95));
-  c96: blue(rgb(0,0,96));
-  c97: blue(rgb(0,0,97));
-  c98: blue(rgb(0,0,98));
-  c99: blue(rgb(0,0,99));
-  c100: blue(rgb(0,0,100));
-  c101: blue(rgb(0,0,101));
-  c102: blue(rgb(0,0,102));
-  c103: blue(rgb(0,0,103));
-  c104: blue(rgb(0,0,104));
-  c105: blue(rgb(0,0,105));
-  c106: blue(rgb(0,0,106));
-  c107: blue(rgb(0,0,107));
-  c108: blue(rgb(0,0,108));
-  c109: blue(rgb(0,0,109));
-  c110: blue(rgb(0,0,110));
-  c111: blue(rgb(0,0,111));
-  c112: blue(rgb(0,0,112));
-  c113: blue(rgb(0,0,113));
-  c114: blue(rgb(0,0,114));
-  c115: blue(rgb(0,0,115));
-  c116: blue(rgb(0,0,116));
-  c117: blue(rgb(0,0,117));
-  c118: blue(rgb(0,0,118));
-  c119: blue(rgb(0,0,119));
-  c120: blue(rgb(0,0,120));
-  c121: blue(rgb(0,0,121));
-  c122: blue(rgb(0,0,122));
-  c123: blue(rgb(0,0,123));
-  c124: blue(rgb(0,0,124));
-  c125: blue(rgb(0,0,125));
-  c126: blue(rgb(0,0,126));
-  c127: blue(rgb(0,0,127));
-  c128: blue(rgb(0,0,128));
-  c129: blue(rgb(0,0,129));
-  c130: blue(rgb(0,0,130));
-  c131: blue(rgb(0,0,131));
-  c132: blue(rgb(0,0,132));
-  c133: blue(rgb(0,0,133));
-  c134: blue(rgb(0,0,134));
-  c135: blue(rgb(0,0,135));
-  c136: blue(rgb(0,0,136));
-  c137: blue(rgb(0,0,137));
-  c138: blue(rgb(0,0,138));
-  c139: blue(rgb(0,0,139));
-  c140: blue(rgb(0,0,140));
-  c141: blue(rgb(0,0,141));
-  c142: blue(rgb(0,0,142));
-  c143: blue(rgb(0,0,143));
-  c144: blue(rgb(0,0,144));
-  c145: blue(rgb(0,0,145));
-  c146: blue(rgb(0,0,146));
-  c147: blue(rgb(0,0,147));
-  c148: blue(rgb(0,0,148));
-  c149: blue(rgb(0,0,149));
-  c150: blue(rgb(0,0,150));
-  c151: blue(rgb(0,0,151));
-  c152: blue(rgb(0,0,152));
-  c153: blue(rgb(0,0,153));
-  c154: blue(rgb(0,0,154));
-  c155: blue(rgb(0,0,155));
-  c156: blue(rgb(0,0,156));
-  c157: blue(rgb(0,0,157));
-  c158: blue(rgb(0,0,158));
-  c159: blue(rgb(0,0,159));
-  c160: blue(rgb(0,0,160));
-  c161: blue(rgb(0,0,161));
-  c162: blue(rgb(0,0,162));
-  c163: blue(rgb(0,0,163));
-  c164: blue(rgb(0,0,164));
-  c165: blue(rgb(0,0,165));
-  c166: blue(rgb(0,0,166));
-  c167: blue(rgb(0,0,167));
-  c168: blue(rgb(0,0,168));
-  c169: blue(rgb(0,0,169));
-  c170: blue(rgb(0,0,170));
-  c171: blue(rgb(0,0,171));
-  c172: blue(rgb(0,0,172));
-  c173: blue(rgb(0,0,173));
-  c174: blue(rgb(0,0,174));
-  c175: blue(rgb(0,0,175));
-  c176: blue(rgb(0,0,176));
-  c177: blue(rgb(0,0,177));
-  c178: blue(rgb(0,0,178));
-  c179: blue(rgb(0,0,179));
-  c180: blue(rgb(0,0,180));
-  c181: blue(rgb(0,0,181));
-  c182: blue(rgb(0,0,182));
-  c183: blue(rgb(0,0,183));
-  c184: blue(rgb(0,0,184));
-  c185: blue(rgb(0,0,185));
-  c186: blue(rgb(0,0,186));
-  c187: blue(rgb(0,0,187));
-  c188: blue(rgb(0,0,188));
-  c189: blue(rgb(0,0,189));
-  c190: blue(rgb(0,0,190));
-  c191: blue(rgb(0,0,191));
-  c192: blue(rgb(0,0,192));
-  c193: blue(rgb(0,0,193));
-  c194: blue(rgb(0,0,194));
-  c195: blue(rgb(0,0,195));
-  c196: blue(rgb(0,0,196));
-  c197: blue(rgb(0,0,197));
-  c198: blue(rgb(0,0,198));
-  c199: blue(rgb(0,0,199));
-  c200: blue(rgb(0,0,200));
-  c201: blue(rgb(0,0,201));
-  c202: blue(rgb(0,0,202));
-  c203: blue(rgb(0,0,203));
-  c204: blue(rgb(0,0,204));
-  c205: blue(rgb(0,0,205));
-  c206: blue(rgb(0,0,206));
-  c207: blue(rgb(0,0,207));
-  c208: blue(rgb(0,0,208));
-  c209: blue(rgb(0,0,209));
-  c210: blue(rgb(0,0,210));
-  c211: blue(rgb(0,0,211));
-  c212: blue(rgb(0,0,212));
-  c213: blue(rgb(0,0,213));
-  c214: blue(rgb(0,0,214));
-  c215: blue(rgb(0,0,215));
-  c216: blue(rgb(0,0,216));
-  c217: blue(rgb(0,0,217));
-  c218: blue(rgb(0,0,218));
-  c219: blue(rgb(0,0,219));
-  c220: blue(rgb(0,0,220));
-  c221: blue(rgb(0,0,221));
-  c222: blue(rgb(0,0,222));
-  c223: blue(rgb(0,0,223));
-  c224: blue(rgb(0,0,224));
-  c225: blue(rgb(0,0,225));
-  c226: blue(rgb(0,0,226));
-  c227: blue(rgb(0,0,227));
-  c228: blue(rgb(0,0,228));
-  c229: blue(rgb(0,0,229));
-  c230: blue(rgb(0,0,230));
-  c231: blue(rgb(0,0,231));
-  c232: blue(rgb(0,0,232));
-  c233: blue(rgb(0,0,233));
-  c234: blue(rgb(0,0,234));
-  c235: blue(rgb(0,0,235));
-  c236: blue(rgb(0,0,236));
-  c237: blue(rgb(0,0,237));
-  c238: blue(rgb(0,0,238));
-  c239: blue(rgb(0,0,239));
-  c240: blue(rgb(0,0,240));
-  c241: blue(rgb(0,0,241));
-  c242: blue(rgb(0,0,242));
-  c243: blue(rgb(0,0,243));
-  c244: blue(rgb(0,0,244));
-  c245: blue(rgb(0,0,245));
-  c246: blue(rgb(0,0,246));
-  c247: blue(rgb(0,0,247));
-  c248: blue(rgb(0,0,248));
-  c249: blue(rgb(0,0,249));
-  c250: blue(rgb(0,0,250));
-  c251: blue(rgb(0,0,251));
-  c252: blue(rgb(0,0,252));
-  c253: blue(rgb(0,0,253));
-  c254: blue(rgb(0,0,254));
-  c255: blue(rgb(0,0,255));
-  c256: blue(rgb(0,0,256));
-}
-
-<===> output.css
-foo {
-  c-1: 0;
-  c0: 0;
-  c1: 1;
-  c2: 2;
-  c3: 3;
-  c4: 4;
-  c5: 5;
-  c6: 6;
-  c7: 7;
-  c8: 8;
-  c9: 9;
-  c10: 10;
-  c11: 11;
-  c12: 12;
-  c13: 13;
-  c14: 14;
-  c15: 15;
-  c16: 16;
-  c17: 17;
-  c18: 18;
-  c19: 19;
-  c20: 20;
-  c21: 21;
-  c22: 22;
-  c23: 23;
-  c24: 24;
-  c25: 25;
-  c26: 26;
-  c27: 27;
-  c28: 28;
-  c29: 29;
-  c30: 30;
-  c31: 31;
-  c32: 32;
-  c33: 33;
-  c34: 34;
-  c35: 35;
-  c36: 36;
-  c37: 37;
-  c38: 38;
-  c39: 39;
-  c40: 40;
-  c41: 41;
-  c42: 42;
-  c43: 43;
-  c44: 44;
-  c45: 45;
-  c46: 46;
-  c47: 47;
-  c48: 48;
-  c49: 49;
-  c50: 50;
-  c51: 51;
-  c52: 52;
-  c53: 53;
-  c54: 54;
-  c55: 55;
-  c56: 56;
-  c57: 57;
-  c58: 58;
-  c59: 59;
-  c60: 60;
-  c61: 61;
-  c62: 62;
-  c63: 63;
-  c64: 64;
-  c65: 65;
-  c66: 66;
-  c67: 67;
-  c68: 68;
-  c69: 69;
-  c70: 70;
-  c71: 71;
-  c72: 72;
-  c73: 73;
-  c74: 74;
-  c75: 75;
-  c76: 76;
-  c77: 77;
-  c78: 78;
-  c79: 79;
-  c80: 80;
-  c81: 81;
-  c82: 82;
-  c83: 83;
-  c84: 84;
-  c85: 85;
-  c86: 86;
-  c87: 87;
-  c88: 88;
-  c89: 89;
-  c90: 90;
-  c91: 91;
-  c92: 92;
-  c93: 93;
-  c94: 94;
-  c95: 95;
-  c96: 96;
-  c97: 97;
-  c98: 98;
-  c99: 99;
-  c100: 100;
-  c101: 101;
-  c102: 102;
-  c103: 103;
-  c104: 104;
-  c105: 105;
-  c106: 106;
-  c107: 107;
-  c108: 108;
-  c109: 109;
-  c110: 110;
-  c111: 111;
-  c112: 112;
-  c113: 113;
-  c114: 114;
-  c115: 115;
-  c116: 116;
-  c117: 117;
-  c118: 118;
-  c119: 119;
-  c120: 120;
-  c121: 121;
-  c122: 122;
-  c123: 123;
-  c124: 124;
-  c125: 125;
-  c126: 126;
-  c127: 127;
-  c128: 128;
-  c129: 129;
-  c130: 130;
-  c131: 131;
-  c132: 132;
-  c133: 133;
-  c134: 134;
-  c135: 135;
-  c136: 136;
-  c137: 137;
-  c138: 138;
-  c139: 139;
-  c140: 140;
-  c141: 141;
-  c142: 142;
-  c143: 143;
-  c144: 144;
-  c145: 145;
-  c146: 146;
-  c147: 147;
-  c148: 148;
-  c149: 149;
-  c150: 150;
-  c151: 151;
-  c152: 152;
-  c153: 153;
-  c154: 154;
-  c155: 155;
-  c156: 156;
-  c157: 157;
-  c158: 158;
-  c159: 159;
-  c160: 160;
-  c161: 161;
-  c162: 162;
-  c163: 163;
-  c164: 164;
-  c165: 165;
-  c166: 166;
-  c167: 167;
-  c168: 168;
-  c169: 169;
-  c170: 170;
-  c171: 171;
-  c172: 172;
-  c173: 173;
-  c174: 174;
-  c175: 175;
-  c176: 176;
-  c177: 177;
-  c178: 178;
-  c179: 179;
-  c180: 180;
-  c181: 181;
-  c182: 182;
-  c183: 183;
-  c184: 184;
-  c185: 185;
-  c186: 186;
-  c187: 187;
-  c188: 188;
-  c189: 189;
-  c190: 190;
-  c191: 191;
-  c192: 192;
-  c193: 193;
-  c194: 194;
-  c195: 195;
-  c196: 196;
-  c197: 197;
-  c198: 198;
-  c199: 199;
-  c200: 200;
-  c201: 201;
-  c202: 202;
-  c203: 203;
-  c204: 204;
-  c205: 205;
-  c206: 206;
-  c207: 207;
-  c208: 208;
-  c209: 209;
-  c210: 210;
-  c211: 211;
-  c212: 212;
-  c213: 213;
-  c214: 214;
-  c215: 215;
-  c216: 216;
-  c217: 217;
-  c218: 218;
-  c219: 219;
-  c220: 220;
-  c221: 221;
-  c222: 222;
-  c223: 223;
-  c224: 224;
-  c225: 225;
-  c226: 226;
-  c227: 227;
-  c228: 228;
-  c229: 229;
-  c230: 230;
-  c231: 231;
-  c232: 232;
-  c233: 233;
-  c234: 234;
-  c235: 235;
-  c236: 236;
-  c237: 237;
-  c238: 238;
-  c239: 239;
-  c240: 240;
-  c241: 241;
-  c242: 242;
-  c243: 243;
-  c244: 244;
-  c245: 245;
-  c246: 246;
-  c247: 247;
-  c248: 248;
-  c249: 249;
-  c250: 250;
-  c251: 251;
-  c252: 252;
-  c253: 253;
-  c254: 254;
-  c255: 255;
-  c256: 255;
-}
diff --git a/spec/libsass/color-functions/rgb/green.hrx b/spec/libsass/color-functions/rgb/green.hrx
deleted file mode 100644
index 9b4a7026d6..0000000000
--- a/spec/libsass/color-functions/rgb/green.hrx
+++ /dev/null
@@ -1,523 +0,0 @@
-<===> input.scss
-foo {
-  c-1: green(rgb(0,-1,0));
-  c0: green(rgb(0,0,0));
-  c1: green(rgb(0,1,0));
-  c2: green(rgb(0,2,0));
-  c3: green(rgb(0,3,0));
-  c4: green(rgb(0,4,0));
-  c5: green(rgb(0,5,0));
-  c6: green(rgb(0,6,0));
-  c7: green(rgb(0,7,0));
-  c8: green(rgb(0,8,0));
-  c9: green(rgb(0,9,0));
-  c10: green(rgb(0,10,0));
-  c11: green(rgb(0,11,0));
-  c12: green(rgb(0,12,0));
-  c13: green(rgb(0,13,0));
-  c14: green(rgb(0,14,0));
-  c15: green(rgb(0,15,0));
-  c16: green(rgb(0,16,0));
-  c17: green(rgb(0,17,0));
-  c18: green(rgb(0,18,0));
-  c19: green(rgb(0,19,0));
-  c20: green(rgb(0,20,0));
-  c21: green(rgb(0,21,0));
-  c22: green(rgb(0,22,0));
-  c23: green(rgb(0,23,0));
-  c24: green(rgb(0,24,0));
-  c25: green(rgb(0,25,0));
-  c26: green(rgb(0,26,0));
-  c27: green(rgb(0,27,0));
-  c28: green(rgb(0,28,0));
-  c29: green(rgb(0,29,0));
-  c30: green(rgb(0,30,0));
-  c31: green(rgb(0,31,0));
-  c32: green(rgb(0,32,0));
-  c33: green(rgb(0,33,0));
-  c34: green(rgb(0,34,0));
-  c35: green(rgb(0,35,0));
-  c36: green(rgb(0,36,0));
-  c37: green(rgb(0,37,0));
-  c38: green(rgb(0,38,0));
-  c39: green(rgb(0,39,0));
-  c40: green(rgb(0,40,0));
-  c41: green(rgb(0,41,0));
-  c42: green(rgb(0,42,0));
-  c43: green(rgb(0,43,0));
-  c44: green(rgb(0,44,0));
-  c45: green(rgb(0,45,0));
-  c46: green(rgb(0,46,0));
-  c47: green(rgb(0,47,0));
-  c48: green(rgb(0,48,0));
-  c49: green(rgb(0,49,0));
-  c50: green(rgb(0,50,0));
-  c51: green(rgb(0,51,0));
-  c52: green(rgb(0,52,0));
-  c53: green(rgb(0,53,0));
-  c54: green(rgb(0,54,0));
-  c55: green(rgb(0,55,0));
-  c56: green(rgb(0,56,0));
-  c57: green(rgb(0,57,0));
-  c58: green(rgb(0,58,0));
-  c59: green(rgb(0,59,0));
-  c60: green(rgb(0,60,0));
-  c61: green(rgb(0,61,0));
-  c62: green(rgb(0,62,0));
-  c63: green(rgb(0,63,0));
-  c64: green(rgb(0,64,0));
-  c65: green(rgb(0,65,0));
-  c66: green(rgb(0,66,0));
-  c67: green(rgb(0,67,0));
-  c68: green(rgb(0,68,0));
-  c69: green(rgb(0,69,0));
-  c70: green(rgb(0,70,0));
-  c71: green(rgb(0,71,0));
-  c72: green(rgb(0,72,0));
-  c73: green(rgb(0,73,0));
-  c74: green(rgb(0,74,0));
-  c75: green(rgb(0,75,0));
-  c76: green(rgb(0,76,0));
-  c77: green(rgb(0,77,0));
-  c78: green(rgb(0,78,0));
-  c79: green(rgb(0,79,0));
-  c80: green(rgb(0,80,0));
-  c81: green(rgb(0,81,0));
-  c82: green(rgb(0,82,0));
-  c83: green(rgb(0,83,0));
-  c84: green(rgb(0,84,0));
-  c85: green(rgb(0,85,0));
-  c86: green(rgb(0,86,0));
-  c87: green(rgb(0,87,0));
-  c88: green(rgb(0,88,0));
-  c89: green(rgb(0,89,0));
-  c90: green(rgb(0,90,0));
-  c91: green(rgb(0,91,0));
-  c92: green(rgb(0,92,0));
-  c93: green(rgb(0,93,0));
-  c94: green(rgb(0,94,0));
-  c95: green(rgb(0,95,0));
-  c96: green(rgb(0,96,0));
-  c97: green(rgb(0,97,0));
-  c98: green(rgb(0,98,0));
-  c99: green(rgb(0,99,0));
-  c100: green(rgb(0,100,0));
-  c101: green(rgb(0,101,0));
-  c102: green(rgb(0,102,0));
-  c103: green(rgb(0,103,0));
-  c104: green(rgb(0,104,0));
-  c105: green(rgb(0,105,0));
-  c106: green(rgb(0,106,0));
-  c107: green(rgb(0,107,0));
-  c108: green(rgb(0,108,0));
-  c109: green(rgb(0,109,0));
-  c110: green(rgb(0,110,0));
-  c111: green(rgb(0,111,0));
-  c112: green(rgb(0,112,0));
-  c113: green(rgb(0,113,0));
-  c114: green(rgb(0,114,0));
-  c115: green(rgb(0,115,0));
-  c116: green(rgb(0,116,0));
-  c117: green(rgb(0,117,0));
-  c118: green(rgb(0,118,0));
-  c119: green(rgb(0,119,0));
-  c120: green(rgb(0,120,0));
-  c121: green(rgb(0,121,0));
-  c122: green(rgb(0,122,0));
-  c123: green(rgb(0,123,0));
-  c124: green(rgb(0,124,0));
-  c125: green(rgb(0,125,0));
-  c126: green(rgb(0,126,0));
-  c127: green(rgb(0,127,0));
-  c128: green(rgb(0,128,0));
-  c129: green(rgb(0,129,0));
-  c130: green(rgb(0,130,0));
-  c131: green(rgb(0,131,0));
-  c132: green(rgb(0,132,0));
-  c133: green(rgb(0,133,0));
-  c134: green(rgb(0,134,0));
-  c135: green(rgb(0,135,0));
-  c136: green(rgb(0,136,0));
-  c137: green(rgb(0,137,0));
-  c138: green(rgb(0,138,0));
-  c139: green(rgb(0,139,0));
-  c140: green(rgb(0,140,0));
-  c141: green(rgb(0,141,0));
-  c142: green(rgb(0,142,0));
-  c143: green(rgb(0,143,0));
-  c144: green(rgb(0,144,0));
-  c145: green(rgb(0,145,0));
-  c146: green(rgb(0,146,0));
-  c147: green(rgb(0,147,0));
-  c148: green(rgb(0,148,0));
-  c149: green(rgb(0,149,0));
-  c150: green(rgb(0,150,0));
-  c151: green(rgb(0,151,0));
-  c152: green(rgb(0,152,0));
-  c153: green(rgb(0,153,0));
-  c154: green(rgb(0,154,0));
-  c155: green(rgb(0,155,0));
-  c156: green(rgb(0,156,0));
-  c157: green(rgb(0,157,0));
-  c158: green(rgb(0,158,0));
-  c159: green(rgb(0,159,0));
-  c160: green(rgb(0,160,0));
-  c161: green(rgb(0,161,0));
-  c162: green(rgb(0,162,0));
-  c163: green(rgb(0,163,0));
-  c164: green(rgb(0,164,0));
-  c165: green(rgb(0,165,0));
-  c166: green(rgb(0,166,0));
-  c167: green(rgb(0,167,0));
-  c168: green(rgb(0,168,0));
-  c169: green(rgb(0,169,0));
-  c170: green(rgb(0,170,0));
-  c171: green(rgb(0,171,0));
-  c172: green(rgb(0,172,0));
-  c173: green(rgb(0,173,0));
-  c174: green(rgb(0,174,0));
-  c175: green(rgb(0,175,0));
-  c176: green(rgb(0,176,0));
-  c177: green(rgb(0,177,0));
-  c178: green(rgb(0,178,0));
-  c179: green(rgb(0,179,0));
-  c180: green(rgb(0,180,0));
-  c181: green(rgb(0,181,0));
-  c182: green(rgb(0,182,0));
-  c183: green(rgb(0,183,0));
-  c184: green(rgb(0,184,0));
-  c185: green(rgb(0,185,0));
-  c186: green(rgb(0,186,0));
-  c187: green(rgb(0,187,0));
-  c188: green(rgb(0,188,0));
-  c189: green(rgb(0,189,0));
-  c190: green(rgb(0,190,0));
-  c191: green(rgb(0,191,0));
-  c192: green(rgb(0,192,0));
-  c193: green(rgb(0,193,0));
-  c194: green(rgb(0,194,0));
-  c195: green(rgb(0,195,0));
-  c196: green(rgb(0,196,0));
-  c197: green(rgb(0,197,0));
-  c198: green(rgb(0,198,0));
-  c199: green(rgb(0,199,0));
-  c200: green(rgb(0,200,0));
-  c201: green(rgb(0,201,0));
-  c202: green(rgb(0,202,0));
-  c203: green(rgb(0,203,0));
-  c204: green(rgb(0,204,0));
-  c205: green(rgb(0,205,0));
-  c206: green(rgb(0,206,0));
-  c207: green(rgb(0,207,0));
-  c208: green(rgb(0,208,0));
-  c209: green(rgb(0,209,0));
-  c210: green(rgb(0,210,0));
-  c211: green(rgb(0,211,0));
-  c212: green(rgb(0,212,0));
-  c213: green(rgb(0,213,0));
-  c214: green(rgb(0,214,0));
-  c215: green(rgb(0,215,0));
-  c216: green(rgb(0,216,0));
-  c217: green(rgb(0,217,0));
-  c218: green(rgb(0,218,0));
-  c219: green(rgb(0,219,0));
-  c220: green(rgb(0,220,0));
-  c221: green(rgb(0,221,0));
-  c222: green(rgb(0,222,0));
-  c223: green(rgb(0,223,0));
-  c224: green(rgb(0,224,0));
-  c225: green(rgb(0,225,0));
-  c226: green(rgb(0,226,0));
-  c227: green(rgb(0,227,0));
-  c228: green(rgb(0,228,0));
-  c229: green(rgb(0,229,0));
-  c230: green(rgb(0,230,0));
-  c231: green(rgb(0,231,0));
-  c232: green(rgb(0,232,0));
-  c233: green(rgb(0,233,0));
-  c234: green(rgb(0,234,0));
-  c235: green(rgb(0,235,0));
-  c236: green(rgb(0,236,0));
-  c237: green(rgb(0,237,0));
-  c238: green(rgb(0,238,0));
-  c239: green(rgb(0,239,0));
-  c240: green(rgb(0,240,0));
-  c241: green(rgb(0,241,0));
-  c242: green(rgb(0,242,0));
-  c243: green(rgb(0,243,0));
-  c244: green(rgb(0,244,0));
-  c245: green(rgb(0,245,0));
-  c246: green(rgb(0,246,0));
-  c247: green(rgb(0,247,0));
-  c248: green(rgb(0,248,0));
-  c249: green(rgb(0,249,0));
-  c250: green(rgb(0,250,0));
-  c251: green(rgb(0,251,0));
-  c252: green(rgb(0,252,0));
-  c253: green(rgb(0,253,0));
-  c254: green(rgb(0,254,0));
-  c255: green(rgb(0,255,0));
-  c256: green(rgb(0,256,0));
-}
-
-<===> output.css
-foo {
-  c-1: 0;
-  c0: 0;
-  c1: 1;
-  c2: 2;
-  c3: 3;
-  c4: 4;
-  c5: 5;
-  c6: 6;
-  c7: 7;
-  c8: 8;
-  c9: 9;
-  c10: 10;
-  c11: 11;
-  c12: 12;
-  c13: 13;
-  c14: 14;
-  c15: 15;
-  c16: 16;
-  c17: 17;
-  c18: 18;
-  c19: 19;
-  c20: 20;
-  c21: 21;
-  c22: 22;
-  c23: 23;
-  c24: 24;
-  c25: 25;
-  c26: 26;
-  c27: 27;
-  c28: 28;
-  c29: 29;
-  c30: 30;
-  c31: 31;
-  c32: 32;
-  c33: 33;
-  c34: 34;
-  c35: 35;
-  c36: 36;
-  c37: 37;
-  c38: 38;
-  c39: 39;
-  c40: 40;
-  c41: 41;
-  c42: 42;
-  c43: 43;
-  c44: 44;
-  c45: 45;
-  c46: 46;
-  c47: 47;
-  c48: 48;
-  c49: 49;
-  c50: 50;
-  c51: 51;
-  c52: 52;
-  c53: 53;
-  c54: 54;
-  c55: 55;
-  c56: 56;
-  c57: 57;
-  c58: 58;
-  c59: 59;
-  c60: 60;
-  c61: 61;
-  c62: 62;
-  c63: 63;
-  c64: 64;
-  c65: 65;
-  c66: 66;
-  c67: 67;
-  c68: 68;
-  c69: 69;
-  c70: 70;
-  c71: 71;
-  c72: 72;
-  c73: 73;
-  c74: 74;
-  c75: 75;
-  c76: 76;
-  c77: 77;
-  c78: 78;
-  c79: 79;
-  c80: 80;
-  c81: 81;
-  c82: 82;
-  c83: 83;
-  c84: 84;
-  c85: 85;
-  c86: 86;
-  c87: 87;
-  c88: 88;
-  c89: 89;
-  c90: 90;
-  c91: 91;
-  c92: 92;
-  c93: 93;
-  c94: 94;
-  c95: 95;
-  c96: 96;
-  c97: 97;
-  c98: 98;
-  c99: 99;
-  c100: 100;
-  c101: 101;
-  c102: 102;
-  c103: 103;
-  c104: 104;
-  c105: 105;
-  c106: 106;
-  c107: 107;
-  c108: 108;
-  c109: 109;
-  c110: 110;
-  c111: 111;
-  c112: 112;
-  c113: 113;
-  c114: 114;
-  c115: 115;
-  c116: 116;
-  c117: 117;
-  c118: 118;
-  c119: 119;
-  c120: 120;
-  c121: 121;
-  c122: 122;
-  c123: 123;
-  c124: 124;
-  c125: 125;
-  c126: 126;
-  c127: 127;
-  c128: 128;
-  c129: 129;
-  c130: 130;
-  c131: 131;
-  c132: 132;
-  c133: 133;
-  c134: 134;
-  c135: 135;
-  c136: 136;
-  c137: 137;
-  c138: 138;
-  c139: 139;
-  c140: 140;
-  c141: 141;
-  c142: 142;
-  c143: 143;
-  c144: 144;
-  c145: 145;
-  c146: 146;
-  c147: 147;
-  c148: 148;
-  c149: 149;
-  c150: 150;
-  c151: 151;
-  c152: 152;
-  c153: 153;
-  c154: 154;
-  c155: 155;
-  c156: 156;
-  c157: 157;
-  c158: 158;
-  c159: 159;
-  c160: 160;
-  c161: 161;
-  c162: 162;
-  c163: 163;
-  c164: 164;
-  c165: 165;
-  c166: 166;
-  c167: 167;
-  c168: 168;
-  c169: 169;
-  c170: 170;
-  c171: 171;
-  c172: 172;
-  c173: 173;
-  c174: 174;
-  c175: 175;
-  c176: 176;
-  c177: 177;
-  c178: 178;
-  c179: 179;
-  c180: 180;
-  c181: 181;
-  c182: 182;
-  c183: 183;
-  c184: 184;
-  c185: 185;
-  c186: 186;
-  c187: 187;
-  c188: 188;
-  c189: 189;
-  c190: 190;
-  c191: 191;
-  c192: 192;
-  c193: 193;
-  c194: 194;
-  c195: 195;
-  c196: 196;
-  c197: 197;
-  c198: 198;
-  c199: 199;
-  c200: 200;
-  c201: 201;
-  c202: 202;
-  c203: 203;
-  c204: 204;
-  c205: 205;
-  c206: 206;
-  c207: 207;
-  c208: 208;
-  c209: 209;
-  c210: 210;
-  c211: 211;
-  c212: 212;
-  c213: 213;
-  c214: 214;
-  c215: 215;
-  c216: 216;
-  c217: 217;
-  c218: 218;
-  c219: 219;
-  c220: 220;
-  c221: 221;
-  c222: 222;
-  c223: 223;
-  c224: 224;
-  c225: 225;
-  c226: 226;
-  c227: 227;
-  c228: 228;
-  c229: 229;
-  c230: 230;
-  c231: 231;
-  c232: 232;
-  c233: 233;
-  c234: 234;
-  c235: 235;
-  c236: 236;
-  c237: 237;
-  c238: 238;
-  c239: 239;
-  c240: 240;
-  c241: 241;
-  c242: 242;
-  c243: 243;
-  c244: 244;
-  c245: 245;
-  c246: 246;
-  c247: 247;
-  c248: 248;
-  c249: 249;
-  c250: 250;
-  c251: 251;
-  c252: 252;
-  c253: 253;
-  c254: 254;
-  c255: 255;
-  c256: 255;
-}
diff --git a/spec/libsass/color-functions/rgb/mix.hrx b/spec/libsass/color-functions/rgb/mix.hrx
deleted file mode 100644
index 6be02883a3..0000000000
--- a/spec/libsass/color-functions/rgb/mix.hrx
+++ /dev/null
@@ -1,211 +0,0 @@
-<===> input.scss
-foo {
-  // c-1: mix(black,white,-1%);
-  c0: mix(black,white,0%);
-  c1: mix(black,white,1%);
-  c2: mix(black,white,2%);
-  c3: mix(black,white,3%);
-  c4: mix(black,white,4%);
-  c5: mix(black,white,5%);
-  c6: mix(black,white,6%);
-  c7: mix(black,white,7%);
-  c8: mix(black,white,8%);
-  c9: mix(black,white,9%);
-  c10: mix(black,white,10%);
-  c11: mix(black,white,11%);
-  c12: mix(black,white,12%);
-  c13: mix(black,white,13%);
-  c14: mix(black,white,14%);
-  c15: mix(black,white,15%);
-  c16: mix(black,white,16%);
-  c17: mix(black,white,17%);
-  c18: mix(black,white,18%);
-  c19: mix(black,white,19%);
-  c20: mix(black,white,20%);
-  c21: mix(black,white,21%);
-  c22: mix(black,white,22%);
-  c23: mix(black,white,23%);
-  c24: mix(black,white,24%);
-  c25: mix(black,white,25%);
-  c26: mix(black,white,26%);
-  c27: mix(black,white,27%);
-  c28: mix(black,white,28%);
-  c29: mix(black,white,29%);
-  c30: mix(black,white,30%);
-  c31: mix(black,white,31%);
-  c32: mix(black,white,32%);
-  c33: mix(black,white,33%);
-  c34: mix(black,white,34%);
-  c35: mix(black,white,35%);
-  c36: mix(black,white,36%);
-  c37: mix(black,white,37%);
-  c38: mix(black,white,38%);
-  c39: mix(black,white,39%);
-  c40: mix(black,white,40%);
-  c41: mix(black,white,41%);
-  c42: mix(black,white,42%);
-  c43: mix(black,white,43%);
-  c44: mix(black,white,44%);
-  c45: mix(black,white,45%);
-  c46: mix(black,white,46%);
-  c47: mix(black,white,47%);
-  c48: mix(black,white,48%);
-  c49: mix(black,white,49%);
-  c50: mix(black,white,50%);
-  c51: mix(black,white,51%);
-  c52: mix(black,white,52%);
-  c53: mix(black,white,53%);
-  c54: mix(black,white,54%);
-  c55: mix(black,white,55%);
-  c56: mix(black,white,56%);
-  c57: mix(black,white,57%);
-  c58: mix(black,white,58%);
-  c59: mix(black,white,59%);
-  c60: mix(black,white,60%);
-  c61: mix(black,white,61%);
-  c62: mix(black,white,62%);
-  c63: mix(black,white,63%);
-  c64: mix(black,white,64%);
-  c65: mix(black,white,65%);
-  c66: mix(black,white,66%);
-  c67: mix(black,white,67%);
-  c68: mix(black,white,68%);
-  c69: mix(black,white,69%);
-  c70: mix(black,white,70%);
-  c71: mix(black,white,71%);
-  c72: mix(black,white,72%);
-  c73: mix(black,white,73%);
-  c74: mix(black,white,74%);
-  c75: mix(black,white,75%);
-  c76: mix(black,white,76%);
-  c77: mix(black,white,77%);
-  c78: mix(black,white,78%);
-  c79: mix(black,white,79%);
-  c80: mix(black,white,80%);
-  c81: mix(black,white,81%);
-  c82: mix(black,white,82%);
-  c83: mix(black,white,83%);
-  c84: mix(black,white,84%);
-  c85: mix(black,white,85%);
-  c86: mix(black,white,86%);
-  c87: mix(black,white,87%);
-  c88: mix(black,white,88%);
-  c89: mix(black,white,89%);
-  c90: mix(black,white,90%);
-  c91: mix(black,white,91%);
-  c92: mix(black,white,92%);
-  c93: mix(black,white,93%);
-  c94: mix(black,white,94%);
-  c95: mix(black,white,95%);
-  c96: mix(black,white,96%);
-  c97: mix(black,white,97%);
-  c98: mix(black,white,98%);
-  c99: mix(black,white,99%);
-  c100: mix(black,white,100%);
-  // c101: mix(black,white,101%);
-}
-
-<===> output.css
-foo {
-  c0: white;
-  c1: #fcfcfc;
-  c2: #fafafa;
-  c3: #f7f7f7;
-  c4: whitesmoke;
-  c5: #f2f2f2;
-  c6: #f0f0f0;
-  c7: #ededed;
-  c8: #ebebeb;
-  c9: #e8e8e8;
-  c10: #e6e6e6;
-  c11: #e3e3e3;
-  c12: #e0e0e0;
-  c13: #dedede;
-  c14: #dbdbdb;
-  c15: #d9d9d9;
-  c16: #d6d6d6;
-  c17: #d4d4d4;
-  c18: #d1d1d1;
-  c19: #cfcfcf;
-  c20: #cccccc;
-  c21: #c9c9c9;
-  c22: #c7c7c7;
-  c23: #c4c4c4;
-  c24: #c2c2c2;
-  c25: #bfbfbf;
-  c26: #bdbdbd;
-  c27: #bababa;
-  c28: #b8b8b8;
-  c29: #b5b5b5;
-  c30: #b3b3b3;
-  c31: #b0b0b0;
-  c32: #adadad;
-  c33: #ababab;
-  c34: #a8a8a8;
-  c35: #a6a6a6;
-  c36: #a3a3a3;
-  c37: #a1a1a1;
-  c38: #9e9e9e;
-  c39: #9c9c9c;
-  c40: #999999;
-  c41: #969696;
-  c42: #949494;
-  c43: #919191;
-  c44: #8f8f8f;
-  c45: #8c8c8c;
-  c46: #8a8a8a;
-  c47: #878787;
-  c48: #858585;
-  c49: #828282;
-  c50: gray;
-  c51: #7d7d7d;
-  c52: #7a7a7a;
-  c53: #787878;
-  c54: #757575;
-  c55: #737373;
-  c56: #707070;
-  c57: #6e6e6e;
-  c58: #6b6b6b;
-  c59: dimgray;
-  c60: #666666;
-  c61: #636363;
-  c62: #616161;
-  c63: #5e5e5e;
-  c64: #5c5c5c;
-  c65: #595959;
-  c66: #575757;
-  c67: #545454;
-  c68: #525252;
-  c69: #4f4f4f;
-  c70: #4d4d4d;
-  c71: #4a4a4a;
-  c72: #474747;
-  c73: #454545;
-  c74: #424242;
-  c75: #404040;
-  c76: #3d3d3d;
-  c77: #3b3b3b;
-  c78: #383838;
-  c79: #363636;
-  c80: #333333;
-  c81: #303030;
-  c82: #2e2e2e;
-  c83: #2b2b2b;
-  c84: #292929;
-  c85: #262626;
-  c86: #242424;
-  c87: #212121;
-  c88: #1f1f1f;
-  c89: #1c1c1c;
-  c90: #1a1a1a;
-  c91: #171717;
-  c92: #141414;
-  c93: #121212;
-  c94: #0f0f0f;
-  c95: #0d0d0d;
-  c96: #0a0a0a;
-  c97: #080808;
-  c98: #050505;
-  c99: #030303;
-  c100: black;
-}
diff --git a/spec/libsass/color-functions/rgb/red.hrx b/spec/libsass/color-functions/rgb/red.hrx
deleted file mode 100644
index 2d42bd03f7..0000000000
--- a/spec/libsass/color-functions/rgb/red.hrx
+++ /dev/null
@@ -1,523 +0,0 @@
-<===> input.scss
-foo {
-  c-1: red(rgb(-1,0,0));
-  c0: red(rgb(0,0,0));
-  c1: red(rgb(1,0,0));
-  c2: red(rgb(2,0,0));
-  c3: red(rgb(3,0,0));
-  c4: red(rgb(4,0,0));
-  c5: red(rgb(5,0,0));
-  c6: red(rgb(6,0,0));
-  c7: red(rgb(7,0,0));
-  c8: red(rgb(8,0,0));
-  c9: red(rgb(9,0,0));
-  c10: red(rgb(10,0,0));
-  c11: red(rgb(11,0,0));
-  c12: red(rgb(12,0,0));
-  c13: red(rgb(13,0,0));
-  c14: red(rgb(14,0,0));
-  c15: red(rgb(15,0,0));
-  c16: red(rgb(16,0,0));
-  c17: red(rgb(17,0,0));
-  c18: red(rgb(18,0,0));
-  c19: red(rgb(19,0,0));
-  c20: red(rgb(20,0,0));
-  c21: red(rgb(21,0,0));
-  c22: red(rgb(22,0,0));
-  c23: red(rgb(23,0,0));
-  c24: red(rgb(24,0,0));
-  c25: red(rgb(25,0,0));
-  c26: red(rgb(26,0,0));
-  c27: red(rgb(27,0,0));
-  c28: red(rgb(28,0,0));
-  c29: red(rgb(29,0,0));
-  c30: red(rgb(30,0,0));
-  c31: red(rgb(31,0,0));
-  c32: red(rgb(32,0,0));
-  c33: red(rgb(33,0,0));
-  c34: red(rgb(34,0,0));
-  c35: red(rgb(35,0,0));
-  c36: red(rgb(36,0,0));
-  c37: red(rgb(37,0,0));
-  c38: red(rgb(38,0,0));
-  c39: red(rgb(39,0,0));
-  c40: red(rgb(40,0,0));
-  c41: red(rgb(41,0,0));
-  c42: red(rgb(42,0,0));
-  c43: red(rgb(43,0,0));
-  c44: red(rgb(44,0,0));
-  c45: red(rgb(45,0,0));
-  c46: red(rgb(46,0,0));
-  c47: red(rgb(47,0,0));
-  c48: red(rgb(48,0,0));
-  c49: red(rgb(49,0,0));
-  c50: red(rgb(50,0,0));
-  c51: red(rgb(51,0,0));
-  c52: red(rgb(52,0,0));
-  c53: red(rgb(53,0,0));
-  c54: red(rgb(54,0,0));
-  c55: red(rgb(55,0,0));
-  c56: red(rgb(56,0,0));
-  c57: red(rgb(57,0,0));
-  c58: red(rgb(58,0,0));
-  c59: red(rgb(59,0,0));
-  c60: red(rgb(60,0,0));
-  c61: red(rgb(61,0,0));
-  c62: red(rgb(62,0,0));
-  c63: red(rgb(63,0,0));
-  c64: red(rgb(64,0,0));
-  c65: red(rgb(65,0,0));
-  c66: red(rgb(66,0,0));
-  c67: red(rgb(67,0,0));
-  c68: red(rgb(68,0,0));
-  c69: red(rgb(69,0,0));
-  c70: red(rgb(70,0,0));
-  c71: red(rgb(71,0,0));
-  c72: red(rgb(72,0,0));
-  c73: red(rgb(73,0,0));
-  c74: red(rgb(74,0,0));
-  c75: red(rgb(75,0,0));
-  c76: red(rgb(76,0,0));
-  c77: red(rgb(77,0,0));
-  c78: red(rgb(78,0,0));
-  c79: red(rgb(79,0,0));
-  c80: red(rgb(80,0,0));
-  c81: red(rgb(81,0,0));
-  c82: red(rgb(82,0,0));
-  c83: red(rgb(83,0,0));
-  c84: red(rgb(84,0,0));
-  c85: red(rgb(85,0,0));
-  c86: red(rgb(86,0,0));
-  c87: red(rgb(87,0,0));
-  c88: red(rgb(88,0,0));
-  c89: red(rgb(89,0,0));
-  c90: red(rgb(90,0,0));
-  c91: red(rgb(91,0,0));
-  c92: red(rgb(92,0,0));
-  c93: red(rgb(93,0,0));
-  c94: red(rgb(94,0,0));
-  c95: red(rgb(95,0,0));
-  c96: red(rgb(96,0,0));
-  c97: red(rgb(97,0,0));
-  c98: red(rgb(98,0,0));
-  c99: red(rgb(99,0,0));
-  c100: red(rgb(100,0,0));
-  c101: red(rgb(101,0,0));
-  c102: red(rgb(102,0,0));
-  c103: red(rgb(103,0,0));
-  c104: red(rgb(104,0,0));
-  c105: red(rgb(105,0,0));
-  c106: red(rgb(106,0,0));
-  c107: red(rgb(107,0,0));
-  c108: red(rgb(108,0,0));
-  c109: red(rgb(109,0,0));
-  c110: red(rgb(110,0,0));
-  c111: red(rgb(111,0,0));
-  c112: red(rgb(112,0,0));
-  c113: red(rgb(113,0,0));
-  c114: red(rgb(114,0,0));
-  c115: red(rgb(115,0,0));
-  c116: red(rgb(116,0,0));
-  c117: red(rgb(117,0,0));
-  c118: red(rgb(118,0,0));
-  c119: red(rgb(119,0,0));
-  c120: red(rgb(120,0,0));
-  c121: red(rgb(121,0,0));
-  c122: red(rgb(122,0,0));
-  c123: red(rgb(123,0,0));
-  c124: red(rgb(124,0,0));
-  c125: red(rgb(125,0,0));
-  c126: red(rgb(126,0,0));
-  c127: red(rgb(127,0,0));
-  c128: red(rgb(128,0,0));
-  c129: red(rgb(129,0,0));
-  c130: red(rgb(130,0,0));
-  c131: red(rgb(131,0,0));
-  c132: red(rgb(132,0,0));
-  c133: red(rgb(133,0,0));
-  c134: red(rgb(134,0,0));
-  c135: red(rgb(135,0,0));
-  c136: red(rgb(136,0,0));
-  c137: red(rgb(137,0,0));
-  c138: red(rgb(138,0,0));
-  c139: red(rgb(139,0,0));
-  c140: red(rgb(140,0,0));
-  c141: red(rgb(141,0,0));
-  c142: red(rgb(142,0,0));
-  c143: red(rgb(143,0,0));
-  c144: red(rgb(144,0,0));
-  c145: red(rgb(145,0,0));
-  c146: red(rgb(146,0,0));
-  c147: red(rgb(147,0,0));
-  c148: red(rgb(148,0,0));
-  c149: red(rgb(149,0,0));
-  c150: red(rgb(150,0,0));
-  c151: red(rgb(151,0,0));
-  c152: red(rgb(152,0,0));
-  c153: red(rgb(153,0,0));
-  c154: red(rgb(154,0,0));
-  c155: red(rgb(155,0,0));
-  c156: red(rgb(156,0,0));
-  c157: red(rgb(157,0,0));
-  c158: red(rgb(158,0,0));
-  c159: red(rgb(159,0,0));
-  c160: red(rgb(160,0,0));
-  c161: red(rgb(161,0,0));
-  c162: red(rgb(162,0,0));
-  c163: red(rgb(163,0,0));
-  c164: red(rgb(164,0,0));
-  c165: red(rgb(165,0,0));
-  c166: red(rgb(166,0,0));
-  c167: red(rgb(167,0,0));
-  c168: red(rgb(168,0,0));
-  c169: red(rgb(169,0,0));
-  c170: red(rgb(170,0,0));
-  c171: red(rgb(171,0,0));
-  c172: red(rgb(172,0,0));
-  c173: red(rgb(173,0,0));
-  c174: red(rgb(174,0,0));
-  c175: red(rgb(175,0,0));
-  c176: red(rgb(176,0,0));
-  c177: red(rgb(177,0,0));
-  c178: red(rgb(178,0,0));
-  c179: red(rgb(179,0,0));
-  c180: red(rgb(180,0,0));
-  c181: red(rgb(181,0,0));
-  c182: red(rgb(182,0,0));
-  c183: red(rgb(183,0,0));
-  c184: red(rgb(184,0,0));
-  c185: red(rgb(185,0,0));
-  c186: red(rgb(186,0,0));
-  c187: red(rgb(187,0,0));
-  c188: red(rgb(188,0,0));
-  c189: red(rgb(189,0,0));
-  c190: red(rgb(190,0,0));
-  c191: red(rgb(191,0,0));
-  c192: red(rgb(192,0,0));
-  c193: red(rgb(193,0,0));
-  c194: red(rgb(194,0,0));
-  c195: red(rgb(195,0,0));
-  c196: red(rgb(196,0,0));
-  c197: red(rgb(197,0,0));
-  c198: red(rgb(198,0,0));
-  c199: red(rgb(199,0,0));
-  c200: red(rgb(200,0,0));
-  c201: red(rgb(201,0,0));
-  c202: red(rgb(202,0,0));
-  c203: red(rgb(203,0,0));
-  c204: red(rgb(204,0,0));
-  c205: red(rgb(205,0,0));
-  c206: red(rgb(206,0,0));
-  c207: red(rgb(207,0,0));
-  c208: red(rgb(208,0,0));
-  c209: red(rgb(209,0,0));
-  c210: red(rgb(210,0,0));
-  c211: red(rgb(211,0,0));
-  c212: red(rgb(212,0,0));
-  c213: red(rgb(213,0,0));
-  c214: red(rgb(214,0,0));
-  c215: red(rgb(215,0,0));
-  c216: red(rgb(216,0,0));
-  c217: red(rgb(217,0,0));
-  c218: red(rgb(218,0,0));
-  c219: red(rgb(219,0,0));
-  c220: red(rgb(220,0,0));
-  c221: red(rgb(221,0,0));
-  c222: red(rgb(222,0,0));
-  c223: red(rgb(223,0,0));
-  c224: red(rgb(224,0,0));
-  c225: red(rgb(225,0,0));
-  c226: red(rgb(226,0,0));
-  c227: red(rgb(227,0,0));
-  c228: red(rgb(228,0,0));
-  c229: red(rgb(229,0,0));
-  c230: red(rgb(230,0,0));
-  c231: red(rgb(231,0,0));
-  c232: red(rgb(232,0,0));
-  c233: red(rgb(233,0,0));
-  c234: red(rgb(234,0,0));
-  c235: red(rgb(235,0,0));
-  c236: red(rgb(236,0,0));
-  c237: red(rgb(237,0,0));
-  c238: red(rgb(238,0,0));
-  c239: red(rgb(239,0,0));
-  c240: red(rgb(240,0,0));
-  c241: red(rgb(241,0,0));
-  c242: red(rgb(242,0,0));
-  c243: red(rgb(243,0,0));
-  c244: red(rgb(244,0,0));
-  c245: red(rgb(245,0,0));
-  c246: red(rgb(246,0,0));
-  c247: red(rgb(247,0,0));
-  c248: red(rgb(248,0,0));
-  c249: red(rgb(249,0,0));
-  c250: red(rgb(250,0,0));
-  c251: red(rgb(251,0,0));
-  c252: red(rgb(252,0,0));
-  c253: red(rgb(253,0,0));
-  c254: red(rgb(254,0,0));
-  c255: red(rgb(255,0,0));
-  c256: red(rgb(256,0,0));
-}
-
-<===> output.css
-foo {
-  c-1: 0;
-  c0: 0;
-  c1: 1;
-  c2: 2;
-  c3: 3;
-  c4: 4;
-  c5: 5;
-  c6: 6;
-  c7: 7;
-  c8: 8;
-  c9: 9;
-  c10: 10;
-  c11: 11;
-  c12: 12;
-  c13: 13;
-  c14: 14;
-  c15: 15;
-  c16: 16;
-  c17: 17;
-  c18: 18;
-  c19: 19;
-  c20: 20;
-  c21: 21;
-  c22: 22;
-  c23: 23;
-  c24: 24;
-  c25: 25;
-  c26: 26;
-  c27: 27;
-  c28: 28;
-  c29: 29;
-  c30: 30;
-  c31: 31;
-  c32: 32;
-  c33: 33;
-  c34: 34;
-  c35: 35;
-  c36: 36;
-  c37: 37;
-  c38: 38;
-  c39: 39;
-  c40: 40;
-  c41: 41;
-  c42: 42;
-  c43: 43;
-  c44: 44;
-  c45: 45;
-  c46: 46;
-  c47: 47;
-  c48: 48;
-  c49: 49;
-  c50: 50;
-  c51: 51;
-  c52: 52;
-  c53: 53;
-  c54: 54;
-  c55: 55;
-  c56: 56;
-  c57: 57;
-  c58: 58;
-  c59: 59;
-  c60: 60;
-  c61: 61;
-  c62: 62;
-  c63: 63;
-  c64: 64;
-  c65: 65;
-  c66: 66;
-  c67: 67;
-  c68: 68;
-  c69: 69;
-  c70: 70;
-  c71: 71;
-  c72: 72;
-  c73: 73;
-  c74: 74;
-  c75: 75;
-  c76: 76;
-  c77: 77;
-  c78: 78;
-  c79: 79;
-  c80: 80;
-  c81: 81;
-  c82: 82;
-  c83: 83;
-  c84: 84;
-  c85: 85;
-  c86: 86;
-  c87: 87;
-  c88: 88;
-  c89: 89;
-  c90: 90;
-  c91: 91;
-  c92: 92;
-  c93: 93;
-  c94: 94;
-  c95: 95;
-  c96: 96;
-  c97: 97;
-  c98: 98;
-  c99: 99;
-  c100: 100;
-  c101: 101;
-  c102: 102;
-  c103: 103;
-  c104: 104;
-  c105: 105;
-  c106: 106;
-  c107: 107;
-  c108: 108;
-  c109: 109;
-  c110: 110;
-  c111: 111;
-  c112: 112;
-  c113: 113;
-  c114: 114;
-  c115: 115;
-  c116: 116;
-  c117: 117;
-  c118: 118;
-  c119: 119;
-  c120: 120;
-  c121: 121;
-  c122: 122;
-  c123: 123;
-  c124: 124;
-  c125: 125;
-  c126: 126;
-  c127: 127;
-  c128: 128;
-  c129: 129;
-  c130: 130;
-  c131: 131;
-  c132: 132;
-  c133: 133;
-  c134: 134;
-  c135: 135;
-  c136: 136;
-  c137: 137;
-  c138: 138;
-  c139: 139;
-  c140: 140;
-  c141: 141;
-  c142: 142;
-  c143: 143;
-  c144: 144;
-  c145: 145;
-  c146: 146;
-  c147: 147;
-  c148: 148;
-  c149: 149;
-  c150: 150;
-  c151: 151;
-  c152: 152;
-  c153: 153;
-  c154: 154;
-  c155: 155;
-  c156: 156;
-  c157: 157;
-  c158: 158;
-  c159: 159;
-  c160: 160;
-  c161: 161;
-  c162: 162;
-  c163: 163;
-  c164: 164;
-  c165: 165;
-  c166: 166;
-  c167: 167;
-  c168: 168;
-  c169: 169;
-  c170: 170;
-  c171: 171;
-  c172: 172;
-  c173: 173;
-  c174: 174;
-  c175: 175;
-  c176: 176;
-  c177: 177;
-  c178: 178;
-  c179: 179;
-  c180: 180;
-  c181: 181;
-  c182: 182;
-  c183: 183;
-  c184: 184;
-  c185: 185;
-  c186: 186;
-  c187: 187;
-  c188: 188;
-  c189: 189;
-  c190: 190;
-  c191: 191;
-  c192: 192;
-  c193: 193;
-  c194: 194;
-  c195: 195;
-  c196: 196;
-  c197: 197;
-  c198: 198;
-  c199: 199;
-  c200: 200;
-  c201: 201;
-  c202: 202;
-  c203: 203;
-  c204: 204;
-  c205: 205;
-  c206: 206;
-  c207: 207;
-  c208: 208;
-  c209: 209;
-  c210: 210;
-  c211: 211;
-  c212: 212;
-  c213: 213;
-  c214: 214;
-  c215: 215;
-  c216: 216;
-  c217: 217;
-  c218: 218;
-  c219: 219;
-  c220: 220;
-  c221: 221;
-  c222: 222;
-  c223: 223;
-  c224: 224;
-  c225: 225;
-  c226: 226;
-  c227: 227;
-  c228: 228;
-  c229: 229;
-  c230: 230;
-  c231: 231;
-  c232: 232;
-  c233: 233;
-  c234: 234;
-  c235: 235;
-  c236: 236;
-  c237: 237;
-  c238: 238;
-  c239: 239;
-  c240: 240;
-  c241: 241;
-  c242: 242;
-  c243: 243;
-  c244: 244;
-  c245: 245;
-  c246: 246;
-  c247: 247;
-  c248: 248;
-  c249: 249;
-  c250: 250;
-  c251: 251;
-  c252: 252;
-  c253: 253;
-  c254: 254;
-  c255: 255;
-  c256: 255;
-}
diff --git a/spec/libsass/delayed.hrx b/spec/libsass/delayed.hrx
index d8d331b3d0..bdccb93881 100644
--- a/spec/libsass/delayed.hrx
+++ b/spec/libsass/delayed.hrx
@@ -46,7 +46,7 @@ div {
   foo: 1;
   coo: 0.8888888889;
   bar: true;
-  bar: false and true;
+  bar: false;
   bar: false;
   blah: a;
   blah: 0.75;
@@ -55,7 +55,7 @@ div {
   blix: "hey 0.75 ho";
 }
 
-@media screen and (hux: 3 / 4) {
+@media screen and (hux: 3/4) {
   div {
     color: red;
   }
@@ -68,7 +68,7 @@ span {
   fludge: 0.75;
 }
 
-<===> output-dart-sass.css
+<===> output-libsass.css
 div {
   hoo: 3/4;
   goo: 0.75;
@@ -76,7 +76,7 @@ div {
   foo: 1;
   coo: 0.8888888889;
   bar: true;
-  bar: false;
+  bar: false and true;
   bar: false;
   blah: a;
   blah: 0.75;
diff --git a/spec/libsass/filter-functions.hrx b/spec/libsass/filter-functions.hrx
deleted file mode 100644
index de5f774b2f..0000000000
--- a/spec/libsass/filter-functions.hrx
+++ /dev/null
@@ -1,15 +0,0 @@
-<===> input.scss
-div {
-  hoo: grayscale(0.3) grayscale(200%);
-  moo: opacity(0.3) opacity(200%);
-  poo: invert(0.3) invert(200%);
-  goo: saturate(0.3) saturate(200%);
-}
-
-<===> output.css
-div {
-  hoo: grayscale(0.3) grayscale(200%);
-  moo: opacity(0.3) opacity(200%);
-  poo: invert(0.3) invert(200%);
-  goo: saturate(0.3) saturate(200%);
-}
diff --git a/spec/libsass/parent-selector/missing.hrx b/spec/libsass/parent-selector/missing.hrx
index 798724cb91..ab1ed79aa1 100644
--- a/spec/libsass/parent-selector/missing.hrx
+++ b/spec/libsass/parent-selector/missing.hrx
@@ -41,6 +41,13 @@ Error: Base-level rules cannot contain the parent-selector-referencing character
         from line 29 of /sass/spec/parent-selector/missing/input.scss
   Use --trace for backtrace.
 
+<===> error-libsass
+Error: Top-level selectors may not contain the parent selector "&".
+        on line 22:9 of input.scss, in mixin `grid-media-query`
+        from line 29:12 of input.scss
+>>     body.immobile & {
+   ----^
+
 <===> error-dart-sass
 Error: Top-level selectors may not contain the parent selector "&".
    ,
diff --git a/spec/libsass/variable-scoping/blead-global/expanding/at-root.hrx b/spec/libsass/variable-scoping/blead-global/expanding/at-root.hrx
index 895dc34a73..213553e51c 100644
--- a/spec/libsass/variable-scoping/blead-global/expanding/at-root.hrx
+++ b/spec/libsass/variable-scoping/blead-global/expanding/at-root.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :warning_todo:
-- libsass # sass/libsass#2834
+- sass/libsass#2834
 
 <===> input.scss
 $root_default: initial;
diff --git a/spec/libsass/variable-scoping/blead-global/expanding/each.hrx b/spec/libsass/variable-scoping/blead-global/expanding/each.hrx
index b140891587..b4b5283b7e 100644
--- a/spec/libsass/variable-scoping/blead-global/expanding/each.hrx
+++ b/spec/libsass/variable-scoping/blead-global/expanding/each.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :warning_todo:
-- libsass # sass/libsass#2834
+- sass/libsass#2834
 
 <===> input.scss
 $root_default: initial;
diff --git a/spec/libsass/variable-scoping/blead-global/expanding/else.hrx b/spec/libsass/variable-scoping/blead-global/expanding/else.hrx
index 2a46a16a0c..1667558731 100644
--- a/spec/libsass/variable-scoping/blead-global/expanding/else.hrx
+++ b/spec/libsass/variable-scoping/blead-global/expanding/else.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :warning_todo:
-- libsass # sass/libsass#2834
+- sass/libsass#2834
 
 <===> input.scss
 $root_default: initial;
diff --git a/spec/libsass/variable-scoping/blead-global/expanding/elseif.hrx b/spec/libsass/variable-scoping/blead-global/expanding/elseif.hrx
index c0ceb288c9..44ca5a78ff 100644
--- a/spec/libsass/variable-scoping/blead-global/expanding/elseif.hrx
+++ b/spec/libsass/variable-scoping/blead-global/expanding/elseif.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :warning_todo:
-- libsass # sass/libsass#2834
+- sass/libsass#2834
 
 <===> input.scss
 $root_default: initial;
diff --git a/spec/libsass/variable-scoping/blead-global/expanding/for.hrx b/spec/libsass/variable-scoping/blead-global/expanding/for.hrx
index f0d82e0e08..2f79b88610 100644
--- a/spec/libsass/variable-scoping/blead-global/expanding/for.hrx
+++ b/spec/libsass/variable-scoping/blead-global/expanding/for.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :warning_todo:
-- libsass # sass/libsass#2834
+- sass/libsass#2834
 
 <===> input.scss
 $continue: true;
diff --git a/spec/libsass/variable-scoping/blead-global/expanding/function.hrx b/spec/libsass/variable-scoping/blead-global/expanding/function.hrx
index c6d7a8d261..212047eb17 100644
--- a/spec/libsass/variable-scoping/blead-global/expanding/function.hrx
+++ b/spec/libsass/variable-scoping/blead-global/expanding/function.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :warning_todo:
-- libsass # sass/libsass#2834
+- sass/libsass#2834
 
 <===> input.scss
 $continue_inner: true;
diff --git a/spec/libsass/variable-scoping/blead-global/expanding/if.hrx b/spec/libsass/variable-scoping/blead-global/expanding/if.hrx
index 54f7f30bf8..94b758e66c 100644
--- a/spec/libsass/variable-scoping/blead-global/expanding/if.hrx
+++ b/spec/libsass/variable-scoping/blead-global/expanding/if.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :warning_todo:
-- libsass # sass/libsass#2834
+- sass/libsass#2834
 
 <===> input.scss
 $root_default: initial;
diff --git a/spec/libsass/variable-scoping/blead-global/expanding/mixin.hrx b/spec/libsass/variable-scoping/blead-global/expanding/mixin.hrx
index 2ec22fe4c5..01aa87d478 100644
--- a/spec/libsass/variable-scoping/blead-global/expanding/mixin.hrx
+++ b/spec/libsass/variable-scoping/blead-global/expanding/mixin.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :warning_todo:
-- libsass # sass/libsass#2834
+- sass/libsass#2834
 
 <===> input.scss
 $root_default: initial;
diff --git a/spec/libsass/variable-scoping/blead-global/expanding/ruleset.hrx b/spec/libsass/variable-scoping/blead-global/expanding/ruleset.hrx
index b858e4de66..df35bf8813 100644
--- a/spec/libsass/variable-scoping/blead-global/expanding/ruleset.hrx
+++ b/spec/libsass/variable-scoping/blead-global/expanding/ruleset.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :warning_todo:
-- libsass # sass/libsass#2834
+- sass/libsass#2834
 
 <===> input.scss
 $root_default: initial;
diff --git a/spec/libsass/variable-scoping/blead-global/expanding/while.hrx b/spec/libsass/variable-scoping/blead-global/expanding/while.hrx
index 6840d31114..39abe3ab09 100644
--- a/spec/libsass/variable-scoping/blead-global/expanding/while.hrx
+++ b/spec/libsass/variable-scoping/blead-global/expanding/while.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :warning_todo:
-- libsass # sass/libsass#2834
+- sass/libsass#2834
 
 <===> input.scss
 $continue_inner: true;
diff --git a/spec/libsass/variable-scoping/blead-global/functional/each.hrx b/spec/libsass/variable-scoping/blead-global/functional/each.hrx
index dc59214f06..683a7d8f15 100644
--- a/spec/libsass/variable-scoping/blead-global/functional/each.hrx
+++ b/spec/libsass/variable-scoping/blead-global/functional/each.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :warning_todo:
-- libsass # sass/libsass#2834
+- sass/libsass#2834
 
 <===> input.scss
 $root_default: initial;
diff --git a/spec/libsass/variable-scoping/blead-global/functional/else.hrx b/spec/libsass/variable-scoping/blead-global/functional/else.hrx
index be4f4d1e9a..5e3d09fc58 100644
--- a/spec/libsass/variable-scoping/blead-global/functional/else.hrx
+++ b/spec/libsass/variable-scoping/blead-global/functional/else.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :warning_todo:
-- libsass # sass/libsass#2834
+- sass/libsass#2834
 
 <===> input.scss
 $root_default: initial;
diff --git a/spec/libsass/variable-scoping/blead-global/functional/elseif.hrx b/spec/libsass/variable-scoping/blead-global/functional/elseif.hrx
index 6d24edf3fd..12ad253e6d 100644
--- a/spec/libsass/variable-scoping/blead-global/functional/elseif.hrx
+++ b/spec/libsass/variable-scoping/blead-global/functional/elseif.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :warning_todo:
-- libsass # sass/libsass#2834
+- sass/libsass#2834
 
 <===> input.scss
 $root_default: initial;
diff --git a/spec/libsass/variable-scoping/blead-global/functional/for.hrx b/spec/libsass/variable-scoping/blead-global/functional/for.hrx
index fc1bca909e..53c199318e 100644
--- a/spec/libsass/variable-scoping/blead-global/functional/for.hrx
+++ b/spec/libsass/variable-scoping/blead-global/functional/for.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :warning_todo:
-- libsass # sass/libsass#2834
+- sass/libsass#2834
 
 <===> input.scss
 $root_default: initial;
diff --git a/spec/libsass/variable-scoping/blead-global/functional/if.hrx b/spec/libsass/variable-scoping/blead-global/functional/if.hrx
index f3f5b56270..7a31b065ad 100644
--- a/spec/libsass/variable-scoping/blead-global/functional/if.hrx
+++ b/spec/libsass/variable-scoping/blead-global/functional/if.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :warning_todo:
-- libsass # sass/libsass#2834
+- sass/libsass#2834
 
 <===> input.scss
 $root_default: initial;
diff --git a/spec/libsass/variable-scoping/blead-global/functional/while.hrx b/spec/libsass/variable-scoping/blead-global/functional/while.hrx
index 8153791f02..936c2c74a8 100644
--- a/spec/libsass/variable-scoping/blead-global/functional/while.hrx
+++ b/spec/libsass/variable-scoping/blead-global/functional/while.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :warning_todo:
-- libsass # sass/libsass#2834
+- sass/libsass#2834
 
 <===> input.scss
 $continue_inner: true;
diff --git a/spec/libsass/variable-scoping/defaults-global-null.hrx b/spec/libsass/variable-scoping/defaults-global-null.hrx
index cedae14e7b..6219ae674f 100644
--- a/spec/libsass/variable-scoping/defaults-global-null.hrx
+++ b/spec/libsass/variable-scoping/defaults-global-null.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :warning_todo:
-- libsass # sass/libsass#2834
+- sass/libsass#2834
 
 <===> input.scss
 div {
diff --git a/spec/libsass/variable-scoping/defaults-global.hrx b/spec/libsass/variable-scoping/defaults-global.hrx
index bc0740648a..9ed4f33d01 100644
--- a/spec/libsass/variable-scoping/defaults-global.hrx
+++ b/spec/libsass/variable-scoping/defaults-global.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :warning_todo:
-- libsass # sass/libsass#2834
+- sass/libsass#2834
 
 <===> input.scss
 div {
diff --git a/spec/libsass/variable-scoping/defaults.hrx b/spec/libsass/variable-scoping/defaults.hrx
index 8ee3b17fda..f24f4cacbf 100644
--- a/spec/libsass/variable-scoping/defaults.hrx
+++ b/spec/libsass/variable-scoping/defaults.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :warning_todo:
-- libsass # sass/libsass#2834
+- sass/libsass#2834
 
 <===> input.scss
 $i: 9;
diff --git a/spec/misc/JMA-pseudo-test.hrx b/spec/misc/JMA-pseudo-test.hrx
index c862830ff4..b1ba4a0591 100644
--- a/spec/misc/JMA-pseudo-test.hrx
+++ b/spec/misc/JMA-pseudo-test.hrx
@@ -18,9 +18,3 @@
 .bar .foo h3 {
   color: red;
 }
-
-<===> output-libsass.css
-.foo h1,
-.foo .bar h3, .bar .foo h3 {
-  color: red;
-}
diff --git a/spec/nesting/not.hrx b/spec/nesting/not.hrx
new file mode 100644
index 0000000000..9ec5561a94
--- /dev/null
+++ b/spec/nesting/not.hrx
@@ -0,0 +1,10 @@
+<===> multiple_parent_selectors_with_trailing_ident/input.scss
+// Regression test for sass/libsass#2630
+.a, .b {
+  :not(&-c) {d: e}
+}
+
+<===> multiple_parent_selectors_with_trailing_ident/output.css
+:not(.a-c, .b-c) {
+  d: e;
+}
diff --git a/spec/operations/division.hrx b/spec/operations/division.hrx
index 73728c4409..ae8bf2803b 100644
--- a/spec/operations/division.hrx
+++ b/spec/operations/division.hrx
@@ -21,7 +21,7 @@ a {
 <===> slash/with_string/slash_slash_string/options.yml
 ---
 :todo:
-- libsass # sass/libsass#2840
+- sass/libsass#2840
 
 <===> slash/with_string/slash_slash_string/input.scss
 a {b: 1 / 2 / foo()}
diff --git a/spec/parser/interpolate/11_escaped_literal/02_variable.hrx b/spec/parser/interpolate/11_escaped_literal/02_variable.hrx
index 648bc77a11..3021e6801c 100644
--- a/spec/parser/interpolate/11_escaped_literal/02_variable.hrx
+++ b/spec/parser/interpolate/11_escaped_literal/02_variable.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
 
 <===> input.scss
 $input: l\\ite\ral;
diff --git a/spec/parser/interpolate/11_escaped_literal/03_inline_double.hrx b/spec/parser/interpolate/11_escaped_literal/03_inline_double.hrx
index a0cabd67a7..d3480f6866 100644
--- a/spec/parser/interpolate/11_escaped_literal/03_inline_double.hrx
+++ b/spec/parser/interpolate/11_escaped_literal/03_inline_double.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
 
 <===> input.scss
 .result {
diff --git a/spec/parser/interpolate/11_escaped_literal/04_variable_double.hrx b/spec/parser/interpolate/11_escaped_literal/04_variable_double.hrx
index b17bb643d3..3bc57d9548 100644
--- a/spec/parser/interpolate/11_escaped_literal/04_variable_double.hrx
+++ b/spec/parser/interpolate/11_escaped_literal/04_variable_double.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
 
 <===> input.scss
 $input: l\\ite\ral;
diff --git a/spec/parser/interpolate/11_escaped_literal/05_variable_quoted_double.hrx b/spec/parser/interpolate/11_escaped_literal/05_variable_quoted_double.hrx
index 722f23d242..c296aed7da 100644
--- a/spec/parser/interpolate/11_escaped_literal/05_variable_quoted_double.hrx
+++ b/spec/parser/interpolate/11_escaped_literal/05_variable_quoted_double.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
 
 <===> input.scss
 $input: l\\ite\ral;
diff --git a/spec/parser/interpolate/14_escapes_literal_numbers/03_inline_double.hrx b/spec/parser/interpolate/14_escapes_literal_numbers/03_inline_double.hrx
index 3603cf9303..8cbed68685 100644
--- a/spec/parser/interpolate/14_escapes_literal_numbers/03_inline_double.hrx
+++ b/spec/parser/interpolate/14_escapes_literal_numbers/03_inline_double.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
 
 <===> input.scss
 .result {
diff --git a/spec/parser/interpolate/14_escapes_literal_numbers/04_variable_double.hrx b/spec/parser/interpolate/14_escapes_literal_numbers/04_variable_double.hrx
index d37f08b545..a1393c5453 100644
--- a/spec/parser/interpolate/14_escapes_literal_numbers/04_variable_double.hrx
+++ b/spec/parser/interpolate/14_escapes_literal_numbers/04_variable_double.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
 
 <===> input.scss
 $input: \1\2\3\4\5\6\7\8\9;
diff --git a/spec/parser/interpolate/17_escapes_literal_lowercase/02_variable.hrx b/spec/parser/interpolate/17_escapes_literal_lowercase/02_variable.hrx
index 3f6e7dcbe0..8e685e0a2d 100644
--- a/spec/parser/interpolate/17_escapes_literal_lowercase/02_variable.hrx
+++ b/spec/parser/interpolate/17_escapes_literal_lowercase/02_variable.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
 
 <===> input.scss
 $input: \b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z;
diff --git a/spec/parser/interpolate/17_escapes_literal_lowercase/03_inline_double.hrx b/spec/parser/interpolate/17_escapes_literal_lowercase/03_inline_double.hrx
index 68178d33b9..461a6a1ef7 100644
--- a/spec/parser/interpolate/17_escapes_literal_lowercase/03_inline_double.hrx
+++ b/spec/parser/interpolate/17_escapes_literal_lowercase/03_inline_double.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
 
 <===> input.scss
 .result {
diff --git a/spec/parser/interpolate/17_escapes_literal_lowercase/04_variable_double.hrx b/spec/parser/interpolate/17_escapes_literal_lowercase/04_variable_double.hrx
index 07f0131b47..ad95375923 100644
--- a/spec/parser/interpolate/17_escapes_literal_lowercase/04_variable_double.hrx
+++ b/spec/parser/interpolate/17_escapes_literal_lowercase/04_variable_double.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
 
 <===> input.scss
 $input: \b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z;
diff --git a/spec/parser/interpolate/17_escapes_literal_lowercase/05_variable_quoted_double.hrx b/spec/parser/interpolate/17_escapes_literal_lowercase/05_variable_quoted_double.hrx
index a6bf1824ab..cad3a63643 100644
--- a/spec/parser/interpolate/17_escapes_literal_lowercase/05_variable_quoted_double.hrx
+++ b/spec/parser/interpolate/17_escapes_literal_lowercase/05_variable_quoted_double.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
 
 <===> input.scss
 $input: \b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z;
diff --git a/spec/parser/interpolate/20_escapes_literal_uppercase/02_variable.hrx b/spec/parser/interpolate/20_escapes_literal_uppercase/02_variable.hrx
index a84c18fc7a..52230ae20c 100644
--- a/spec/parser/interpolate/20_escapes_literal_uppercase/02_variable.hrx
+++ b/spec/parser/interpolate/20_escapes_literal_uppercase/02_variable.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
 
 <===> input.scss
 $input: \B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z;
diff --git a/spec/parser/interpolate/20_escapes_literal_uppercase/03_inline_double.hrx b/spec/parser/interpolate/20_escapes_literal_uppercase/03_inline_double.hrx
index 07294f799f..db48f557f7 100644
--- a/spec/parser/interpolate/20_escapes_literal_uppercase/03_inline_double.hrx
+++ b/spec/parser/interpolate/20_escapes_literal_uppercase/03_inline_double.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
 
 <===> input.scss
 .result {
diff --git a/spec/parser/interpolate/20_escapes_literal_uppercase/04_variable_double.hrx b/spec/parser/interpolate/20_escapes_literal_uppercase/04_variable_double.hrx
index d03a848390..ed5dff4b9d 100644
--- a/spec/parser/interpolate/20_escapes_literal_uppercase/04_variable_double.hrx
+++ b/spec/parser/interpolate/20_escapes_literal_uppercase/04_variable_double.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
 
 <===> input.scss
 $input: \B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z;
diff --git a/spec/parser/interpolate/20_escapes_literal_uppercase/05_variable_quoted_double.hrx b/spec/parser/interpolate/20_escapes_literal_uppercase/05_variable_quoted_double.hrx
index 5530674132..2b947d11bb 100644
--- a/spec/parser/interpolate/20_escapes_literal_uppercase/05_variable_quoted_double.hrx
+++ b/spec/parser/interpolate/20_escapes_literal_uppercase/05_variable_quoted_double.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
 
 <===> input.scss
 $input: \B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z;
diff --git a/spec/parser/interpolate/23_escapes_literal_specials/02_variable.hrx b/spec/parser/interpolate/23_escapes_literal_specials/02_variable.hrx
index e8efc2760a..730a88ef13 100644
--- a/spec/parser/interpolate/23_escapes_literal_specials/02_variable.hrx
+++ b/spec/parser/interpolate/23_escapes_literal_specials/02_variable.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
 
 <===> input.scss
 $input: \0_\a_\A;
diff --git a/spec/parser/interpolate/23_escapes_literal_specials/03_inline_double.hrx b/spec/parser/interpolate/23_escapes_literal_specials/03_inline_double.hrx
index 3d0ebbbf02..7dbcdcb3b7 100644
--- a/spec/parser/interpolate/23_escapes_literal_specials/03_inline_double.hrx
+++ b/spec/parser/interpolate/23_escapes_literal_specials/03_inline_double.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
 
 <===> input.scss
 .result {
diff --git a/spec/parser/interpolate/23_escapes_literal_specials/04_variable_double.hrx b/spec/parser/interpolate/23_escapes_literal_specials/04_variable_double.hrx
index 6eceee0168..2834b0230b 100644
--- a/spec/parser/interpolate/23_escapes_literal_specials/04_variable_double.hrx
+++ b/spec/parser/interpolate/23_escapes_literal_specials/04_variable_double.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
 
 <===> input.scss
 $input: \0_\a_\A;
diff --git a/spec/parser/interpolate/23_escapes_literal_specials/05_variable_quoted_double.hrx b/spec/parser/interpolate/23_escapes_literal_specials/05_variable_quoted_double.hrx
index 5bfac4878c..5b56c64bb2 100644
--- a/spec/parser/interpolate/23_escapes_literal_specials/05_variable_quoted_double.hrx
+++ b/spec/parser/interpolate/23_escapes_literal_specials/05_variable_quoted_double.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
 
 <===> input.scss
 $input: \0_\a_\A;
diff --git a/spec/sass/indentation.hrx b/spec/sass/indentation.hrx
index c3b66a5805..6c552bb12d 100644
--- a/spec/sass/indentation.hrx
+++ b/spec/sass/indentation.hrx
@@ -70,7 +70,7 @@ a {
 <===> unusual_newlines/ff/options.yml
 ---
 :todo:
-- libsass # sass/libsass#2843
+- sass/libsass#2843
 
 <===> unusual_newlines/ff/input.sass
 a  b: c  d: e
diff --git a/spec/libsass-todo-tests/scss-tests/046_test_parent_selector_with_subject.hrx b/spec/scss-tests/046_test_parent_selector_with_subject.hrx
similarity index 98%
rename from spec/libsass-todo-tests/scss-tests/046_test_parent_selector_with_subject.hrx
rename to spec/scss-tests/046_test_parent_selector_with_subject.hrx
index c84f499eff..b7b09ec8cf 100644
--- a/spec/libsass-todo-tests/scss-tests/046_test_parent_selector_with_subject.hrx
+++ b/spec/scss-tests/046_test_parent_selector_with_subject.hrx
@@ -2,6 +2,7 @@
 ---
 :ignore_for:
 - dart-sass
+- libsass
 
 <===> input.scss
 foo {
diff --git a/spec/libsass-todo-tests/scss-tests/118_test_parent_selector_with_parent_and_subject.hrx b/spec/scss-tests/118_test_parent_selector_with_parent_and_subject.hrx
similarity index 97%
rename from spec/libsass-todo-tests/scss-tests/118_test_parent_selector_with_parent_and_subject.hrx
rename to spec/scss-tests/118_test_parent_selector_with_parent_and_subject.hrx
index 753f704938..568d54d87d 100644
--- a/spec/libsass-todo-tests/scss-tests/118_test_parent_selector_with_parent_and_subject.hrx
+++ b/spec/scss-tests/118_test_parent_selector_with_parent_and_subject.hrx
@@ -2,6 +2,7 @@
 ---
 :ignore_for:
 - dart-sass
+- libsass
 
 <===> input.scss
 $subject: "!";
diff --git a/spec/scss-tests/191_test_color_translation_functions.hrx b/spec/scss-tests/191_test_color_translation_functions.hrx
deleted file mode 100644
index cc460022b4..0000000000
--- a/spec/scss-tests/191_test_color_translation_functions.hrx
+++ /dev/null
@@ -1,65 +0,0 @@
-<===> input.scss
-$color: #c09853;
-
-.bar {
-	color1: rgba($color,0.5);
-	color2: rgba($color,1);
-}
-
-.darken {
-	color1: darken($color, 10%); 
-	color2: darken($color, 20%); 
-	color3: darken($color, 30%); 
-	color4: darken($color, 40%); 
-	color5: darken($color, 50%); 
-	color6: darken($color, 60%); 
-	color7: darken($color, 70%); 
-	color8: darken($color, 80%); 
-	color9: darken($color, 90%); 
-	color10: darken($color, 100%); 
-}
-
-.lighten {
-	color1: lighten($color, 10%); 
-	color2: lighten($color, 20%); 
-	color3: lighten($color, 30%); 
-	color4: lighten($color, 40%); 
-	color5: lighten($color, 50%); 
-	color6: lighten($color, 60%); 
-	color7: lighten($color, 70%); 
-	color8: lighten($color, 80%); 
-	color9: lighten($color, 90%); 
-	color10: lighten($color, 100%); 
-}
-
-<===> output.css
-.bar {
-  color1: rgba(192, 152, 83, 0.5);
-  color2: #c09853;
-}
-
-.darken {
-  color1: #a47e3c;
-  color2: #7f612e;
-  color3: #594521;
-  color4: #342813;
-  color5: #0f0b05;
-  color6: black;
-  color7: black;
-  color8: black;
-  color9: black;
-  color10: black;
-}
-
-.lighten {
-  color1: #ceae78;
-  color2: #dbc59e;
-  color3: #e9dbc3;
-  color4: #f7f1e8;
-  color5: white;
-  color6: white;
-  color7: white;
-  color8: white;
-  color9: white;
-  color10: white;
-}
diff --git a/spec/scss/ie-backslash.hrx b/spec/scss/ie-backslash.hrx
index c793add28f..9b6f077574 100644
--- a/spec/scss/ie-backslash.hrx
+++ b/spec/scss/ie-backslash.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
 
 <===> input.scss
 div {
diff --git a/spec/scss/media/nesting/merged.hrx b/spec/scss/media/nesting/merged.hrx
index 9ab11a788d..7a5de869a0 100644
--- a/spec/scss/media/nesting/merged.hrx
+++ b/spec/scss/media/nesting/merged.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2695
+- sass/libsass#2695
 
 <===> input.scss
 // Media queries can be nested within one another. The intersection of the two
diff --git a/spec/scss/media/nesting/retained.hrx b/spec/scss/media/nesting/retained.hrx
index 7f5dd7d703..da3bc711e4 100644
--- a/spec/scss/media/nesting/retained.hrx
+++ b/spec/scss/media/nesting/retained.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2694
+- sass/libsass#2694
 
 <===> input.scss
 // There's no way to generate the intersection of these queries. We could write
diff --git a/spec/scss/mix.hrx b/spec/scss/mix.hrx
deleted file mode 100644
index b1ced158ca..0000000000
--- a/spec/scss/mix.hrx
+++ /dev/null
@@ -1,10 +0,0 @@
-<===> input.scss
-div {
-  roo: mix(#f00, #00f);
-  doo: mix(#f00, #00f, 25%); 
-}
-<===> output.css
-div {
-  roo: purple;
-  doo: #4000bf;
-}
diff --git a/spec/scss/placeholder.hrx b/spec/scss/placeholder.hrx
index 1037fe6777..957fc730d8 100644
--- a/spec/scss/placeholder.hrx
+++ b/spec/scss/placeholder.hrx
@@ -13,19 +13,6 @@ hux {
   @extend %x;
 }
 <===> output.css
-foo, hux {
-  color: red;
-}
-
-foo {
-  width: 10px;
-}
-
-hux {
-  height: 12px;
-}
-
-<===> output-dart-sass.css
 hux, foo {
   color: red;
 }
diff --git a/spec/scss/simple-inheritance.hrx b/spec/scss/simple-inheritance.hrx
index e29ad16235..c7d3cee7e9 100644
--- a/spec/scss/simple-inheritance.hrx
+++ b/spec/scss/simple-inheritance.hrx
@@ -64,59 +64,6 @@ g {
   bloo: bloo;
 }
 <===> output.css
-earth mammal, earth dog, earth cat, earth horse, earth naysayer, earth bird {
-  blood: warm;
-}
-
-earth mammal, earth dog, earth cat, earth horse, earth naysayer {
-  produces-milk: true;
-}
-
-dog {
-  says: "Woof!";
-}
-
-cat {
-  says: "Meow.";
-}
-
-horse, naysayer {
-  says: "Nay.";
-}
-
-[hey], ho {
-  a: b;
-}
-
-ho {
-  c: d;
-}
-
-fancy outer space vehicle, fancy outer space new american mars rover, new american mars fancy outer space rover {
-  insides: advanced;
-}
-
-new american mars rover {
-  wheels: big;
-}
-
-foo, a b c {
-  something: whatever;
-}
-
-a b c {
-  blah: blah;
-}
-
-d e f, d e g {
-  blah: blah;
-}
-
-g {
-  bloo: bloo;
-}
-
-<===> output-dart-sass.css
 earth mammal, earth horse, earth naysayer, earth cat, earth dog, earth bird {
   blood: warm;
 }
diff --git a/spec/libsass-todo-issues/issue_963/selector-functions/is_superselector/not_is_superselector_of_less_complex_not.hrx b/spec/selector-functions/is_superselector/not_is_superselector_of_less_complex_not.hrx
similarity index 100%
rename from spec/libsass-todo-issues/issue_963/selector-functions/is_superselector/not_is_superselector_of_less_complex_not.hrx
rename to spec/selector-functions/is_superselector/not_is_superselector_of_less_complex_not.hrx
diff --git a/spec/libsass-todo-issues/issue_963/selector-functions/is_superselector/not_is_superselector_of_superset.hrx b/spec/selector-functions/is_superselector/not_is_superselector_of_superset.hrx
similarity index 100%
rename from spec/libsass-todo-issues/issue_963/selector-functions/is_superselector/not_is_superselector_of_superset.hrx
rename to spec/selector-functions/is_superselector/not_is_superselector_of_superset.hrx
diff --git a/spec/libsass-todo-issues/issue_963/selector-functions/is_superselector/not_is_superselector_of_unique_selectors.hrx b/spec/selector-functions/is_superselector/not_is_superselector_of_unique_selectors.hrx
similarity index 100%
rename from spec/libsass-todo-issues/issue_963/selector-functions/is_superselector/not_is_superselector_of_unique_selectors.hrx
rename to spec/selector-functions/is_superselector/not_is_superselector_of_unique_selectors.hrx
diff --git a/spec/libsass-todo-issues/issue_963/selector-functions/is_superselector/nth_match_can_be_subselector.hrx b/spec/selector-functions/is_superselector/nth_match_can_be_subselector.hrx
similarity index 100%
rename from spec/libsass-todo-issues/issue_963/selector-functions/is_superselector/nth_match_can_be_subselector.hrx
rename to spec/selector-functions/is_superselector/nth_match_can_be_subselector.hrx
diff --git a/spec/libsass-todo-issues/issue_963/selector-functions/is_superselector/nth_match_is_superselector_of_subset_nth_match.hrx b/spec/selector-functions/is_superselector/nth_match_is_superselector_of_subset_nth_match.hrx
similarity index 100%
rename from spec/libsass-todo-issues/issue_963/selector-functions/is_superselector/nth_match_is_superselector_of_subset_nth_match.hrx
rename to spec/selector-functions/is_superselector/nth_match_is_superselector_of_subset_nth_match.hrx
diff --git a/spec/libsass-todo-issues/issue_963/selector-functions/replace/not.hrx b/spec/selector-functions/replace-not.hrx
similarity index 100%
rename from spec/libsass-todo-issues/issue_963/selector-functions/replace/not.hrx
rename to spec/selector-functions/replace-not.hrx
diff --git a/spec/values/identifiers/escape/normalize/options.yml b/spec/values/identifiers/escape/normalize/options.yml
index 3bb0723bb6..8380261167 100644
--- a/spec/values/identifiers/escape/normalize/options.yml
+++ b/spec/values/identifiers/escape/normalize/options.yml
@@ -1,3 +1,3 @@
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
diff --git a/spec/values/identifiers/escape/options.yml b/spec/values/identifiers/escape/options.yml
index 3bb0723bb6..8380261167 100644
--- a/spec/values/identifiers/escape/options.yml
+++ b/spec/values/identifiers/escape/options.yml
@@ -1,3 +1,3 @@
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
diff --git a/spec/values/identifiers/escape/script.hrx b/spec/values/identifiers/escape/script.hrx
index 58965d2ef6..fffb7a6afd 100644
--- a/spec/values/identifiers/escape/script.hrx
+++ b/spec/values/identifiers/escape/script.hrx
@@ -1,7 +1,7 @@
 <===> options.yml
 ---
 :todo:
-- libsass # sass/libsass#2700
+- sass/libsass#2700
 
 <===> input.scss
 // SassScript functions operate on the normalized form of the identifier.
diff --git a/spec/variables.hrx b/spec/variables.hrx
index e09b348603..bab603c2ae 100644
--- a/spec/variables.hrx
+++ b/spec/variables.hrx
@@ -1,7 +1,7 @@
 <===> global/first_declaration/options.yml
 ---
 :warning_todo:
-- libsass # sass/libsass#2834
+- sass/libsass#2834
 
 <===>
 ================================================================================