From 97decf9c4641881dec2303b0b4969673036e129a Mon Sep 17 00:00:00 2001
From: Dominic Farolino <dom@chromium.org>
Date: Tue, 30 Jun 2020 22:13:12 -0700
Subject: [PATCH] Augment iframe lazyload tests for srcdoc

This CL augments the existing iframe lazyload test for srcdoc lazyload
support. Chrome currently does not implement this.

The test accompanies the spec change made at:
https://github.com/whatwg/html/pull/5579.

R=sclittle@chromium.org

Bug: 1101170
Change-Id: I5c5790c5d2eca3efbb01c5470e2267f2265858f6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2276624
Reviewed-by: Scott Little <sclittle@chromium.org>
Commit-Queue: Dominic Farolino <dom@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784331}
---
 common/square.png                             | Bin 0 -> 18299 bytes
 .../iframe-loading-lazy.tentative.html        |  67 +++++++++++++-----
 2 files changed, 48 insertions(+), 19 deletions(-)
 create mode 100644 common/square.png

diff --git a/common/square.png b/common/square.png
new file mode 100644
index 0000000000000000000000000000000000000000..01c9666a8de9d5535615aff830810e5df4b2156f
GIT binary patch
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diff --git a/html/semantics/embedded-content/the-iframe-element/iframe-loading-lazy.tentative.html b/html/semantics/embedded-content/the-iframe-element/iframe-loading-lazy.tentative.html
index 0a882ef25bc19a..1a5f8f7407e340 100644
--- a/html/semantics/embedded-content/the-iframe-element/iframe-loading-lazy.tentative.html
+++ b/html/semantics/embedded-content/the-iframe-element/iframe-loading-lazy.tentative.html
@@ -2,38 +2,56 @@
 <head>
   <title>Iframes with loading='lazy' load when in the viewport</title>
   <link rel="author" title="Scott Little" href="mailto:sclittle@chromium.org">
-  <link rel="help" href="https://github.com/scott-little/lazyload">
+  <link rel="author" title="Dom Farolino" href="mailto:dom@chromium.org">
+  <link rel="help" href="https://github.com/whatwg/html/pull/5579">
   <script src="/resources/testharness.js"></script>
   <script src="/resources/testharnessreport.js"></script>
 </head>
 
 <script>
-  const t = async_test("Test that iframes with loading='lazy' load once they " +
-                       "enter the viewport.");
+  const t_in_viewport =
+    async_test('In-viewport iframes load eagerly');
+  const t_in_viewport_srcdoc=
+    async_test('In-viewport srcdoc iframes load eagerly');
+  const t_below_viewport =
+    async_test('Below-viewport iframes load lazily');
+  const t_below_viewport_srcdoc =
+    async_test('Below-viewport srcdoc iframes load lazily');
 
   let has_window_loaded = false;
-  let has_in_viewport_loaded = false;
 
-  const in_viewport_iframe_onload = t.step_func(() => {
-    assert_false(has_in_viewport_loaded,
-                 "The in_viewport element should load only once.");
-    has_in_viewport_loaded = true;
+  const in_viewport_iframe_onload = t_in_viewport.step_func_done(() => {
+    assert_false(has_window_loaded,
+      "The in_viewport iframe should not block the load event");
   });
 
-  window.addEventListener("load", t.step_func(() => {
-    assert_true(has_in_viewport_loaded,
-                "The in_viewport element should have loaded before " +
-                "window.load().");
+  const in_viewport_srcdoc_iframe_onload = t_in_viewport_srcdoc.step_func_done(() => {
     assert_false(has_window_loaded,
-                 "The window.load() event should only fire once.");
+      "The in_viewport srcdoc iframe should not block the load event");
+  });
+
+  window.addEventListener("load", () => {
     has_window_loaded = true;
-    document.getElementById("below_viewport").scrollIntoView();
-  }));
+    document.getElementById("below_viewport_srcdoc").scrollIntoView();
+  });
+
+  const below_viewport_iframe_onload = t_below_viewport.step_func_done(() => {
+    assert_true(has_window_loaded,
+                "The window.load() event should have fired before " +
+                "the below-viewport iframe loads");
+  });
 
-  const below_viewport_iframe_onload = t.step_func_done(() => {
+  // Must make this accessible to the srcdoc iframe's body.
+  window.below_viewport_srcdoc_iframe_subresource_onload = t_below_viewport_srcdoc.step_func(() => {
     assert_true(has_window_loaded,
                 "The window.load() event should have fired before " +
-                "below_viewport loaded.");
+                "the below-viewport srcdoc iframe's subresource loads");
+  });
+
+  const below_viewport_srcdoc_iframe_onload = t_below_viewport_srcdoc.step_func_done(() => {
+    assert_true(has_window_loaded,
+                "The window.load() event should have fired before " +
+                "the below-viewport srcdoc iframe loads");
   });
 </script>
 
@@ -41,13 +59,24 @@
   <iframe id="in_viewport" src="resources/subframe.html?in-viewport"
           loading="lazy" width="200px" height="100px"
           onload="in_viewport_iframe_onload();"></iframe>
-  <div style="height:1000vh;"></div>
+  <iframe id="in_viewport_srcdoc"
+          srcdoc="<body><img src='/common/square.png?in-viewport'></body>"
+          loading="lazy" width="200px" height="100px"
+          onload="in_viewport_srcdoc_iframe_onload();"></iframe>
+
+  <div style="height:2000vh;"></div>
   <iframe id="below_viewport" src="resources/subframe.html?below-viewport"
           loading="lazy" width="200px" height="100px"
           onload="below_viewport_iframe_onload();"></iframe>
+  <iframe id="below_viewport_srcdoc"
+          srcdoc="<body><img src='/common/square.png?below-viewport'
+                  onload='parent.below_viewport_srcdoc_iframe_subresource_onload();'></body>"
+          loading="lazy" width="200px" height="100px"
+          onload="below_viewport_srcdoc_iframe_onload();"></iframe>
+
 
   <!-- This async script loads very slowly in order to ensure that, if the
-       below_viewport element has started loading, it has a chance to finish
+       below_viewport* elements have started loading, it has a chance to finish
        loading before window.load() happens, so that the test will dependably
        fail in that case instead of potentially passing depending on how long
        different resource fetches take. -->