diff --git a/spec/core_functions/color/lab/_util.scss b/spec/core_functions/color/lab/_util.scss
index 50df4e3d4..106fe41df 100644
--- a/spec/core_functions/color/lab/_util.scss
+++ b/spec/core_functions/color/lab/_util.scss
@@ -4,7 +4,7 @@
 
 @function -real-channel($color, $channel) {
   @if color.is-missing($color, $channel) {
-    @return null;
+    @return none;
   } @else {
     @return color.channel($color, $channel);
   }
diff --git a/spec/core_functions/color/lab/alpha.hrx b/spec/core_functions/color/lab/alpha.hrx
index f74f4c67b..0b068f39d 100644
--- a/spec/core_functions/color/lab/alpha.hrx
+++ b/spec/core_functions/color/lab/alpha.hrx
@@ -4,8 +4,8 @@
 
 <===> transparent/output.css
 a {
-  value: lab(1% 2 3 / 0);
-  channels: 1% 2 3 / 0;
+  value: lab(0% 255 127 / 0);
+  channels: 0% 255 127 / 0;
 }
 
 <===>
@@ -71,11 +71,11 @@ a {
 
 <===>
 ================================================================================
-<===> none/slash/c/input.scss
+<===> none/slash/b/input.scss
 @use 'core_functions/color/lab/util';
 @include util.inspect(lab(1% 2 none / 0.4));
 
-<===> none/slash/c/output.css
+<===> none/slash/b/output.css
 a {
   value: lab(1% 2 none / 0.4);
   channels: 1% 2 none / 0.4;
@@ -95,11 +95,11 @@ a {
 
 <===>
 ================================================================================
-<===> none/slash/c_and_alpha/input.scss
+<===> none/slash/b_and_alpha/input.scss
 @use 'core_functions/color/lab/util';
 @include util.inspect(lab(1% 2 none / none));
 
-<===> none/slash/c_and_alpha/output.css
+<===> none/slash/b_and_alpha/output.css
 a {
   value: lab(1% 2 none / none);
   channels: 1% 2 none / none;
@@ -107,12 +107,12 @@ a {
 
 <===>
 ================================================================================
-<===> none/slash_list/c/input.scss
+<===> none/slash_list/b/input.scss
 @use 'sass:list';
 @use 'core_functions/color/lab/util';
 @include util.inspect(lab(list.slash(1% 2 none, 0.4)));
 
-<===> none/slash_list/c/output.css
+<===> none/slash_list/b/output.css
 a {
   value: lab(1% 2 none / 0.4);
   channels: 1% 2 none / 0.4;
@@ -133,12 +133,12 @@ a {
 
 <===>
 ================================================================================
-<===> none/slash_list/c_and_alpha/input.scss
+<===> none/slash_list/b_and_alpha/input.scss
 @use 'sass:list';
 @use 'core_functions/color/lab/util';
 @include util.inspect(lab(list.slash(1% 2 none, none)));
 
-<===> none/slash_list/c_and_alpha/output.css
+<===> none/slash_list/b_and_alpha/output.css
 a {
   value: lab(1% 2 none / none);
   channels: 1% 2 none / none;
diff --git a/spec/core_functions/color/lab/no_alpha.hrx b/spec/core_functions/color/lab/no_alpha.hrx
index 8d44c9ffd..77695ad80 100644
--- a/spec/core_functions/color/lab/no_alpha.hrx
+++ b/spec/core_functions/color/lab/no_alpha.hrx
@@ -14,7 +14,7 @@ a {
 @use 'core_functions/color/lab/util';
 @include util.inspect(lab(1% 126 300));
 
-<===> unitless/ab/outside_range/output.css
+<===> unitless/ab/above_range/output.css
 a {
   value: lab(1% 126 300);
   channels: 1% 126 300;