Bug 1940129 [wpt PR 49929] - Make dialog focus async when removing open attribute, a=testonly

Automatic update from web-platform-tests
Make dialog focus async when removing open attribute

When the dialog's open attribute is removed which closes the dialog, we
should make the focus async in order to prevent more script from running
inside attribute removal.

Context: whatwg/html#10124 (comment)

Bug: 341935362
Change-Id: I1b76f003e04b802b1868b427a0faddf5f19a3c5e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6085725
Reviewed-by: Di Zhang <dizhanggchromium.org>
Commit-Queue: Joey Arhar <jarharchromium.org>
Cr-Commit-Position: refs/heads/main{#1402551}

--

wpt-commits: 58fd4f845204b88a3ae42b72b613a66e84cbb9f8
wpt-pr: 49929

UltraBlame original commit: 17e5e580ddfe60cd7d062ca9cbe0722342cc5638

Author: marco-c

testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-close-via-attribute.tentative.html

@@ -7,24 +7,34 @@
 <script src="/resources/testdriver-vendor.js"></script>
 
 <button>button</button>
-<dialog>hello world</dialog>
+<dialog>
+  <button>button in dialog</button>
+</dialog>
 
 <script>
 const dialog = document.querySelector('dialog');
 const button = document.querySelector('button');
+const dialogbutton = document.querySelector('dialog > button');
 
 promise_test(async t => {
+  button.focus();
   dialog.showModal();
+  assert_equals(document.activeElement, dialogbutton,
+    '<button> in <dialog> should be focused after opening.');
 
   let closeFired = false;
   let cancelFired = false;
   dialog.addEventListener('close', () => closeFired = true);
   dialog.addEventListener('cancel', () => cancelFired = true);
 
   dialog.removeAttribute('open');
+  assert_equals(document.activeElement, dialogbutton,
+    '<button> in <dialog> should still be focused immediately after removing open.');
   await new Promise(resolve => t.step_timeout(resolve, 0));
   await new Promise(requestAnimationFrame);
 
+  assert_equals(document.activeElement, button,
+    'Previously focused element should be focused after waiting for a task.');
   assert_false(dialog.matches(':modal'),
     'The dialog should not match :modal after closing.');
   assert_false(cancelFired,
@@ -40,17 +50,24 @@
 }, 'Removing the open attribute from an open modal dialog should run the closing algorithm.');
 
 promise_test(async t => {
+  button.focus();
   dialog.show();
+  assert_equals(document.activeElement, dialogbutton,
+    '<button> in <dialog> should be focused after opening.');
 
   let closeFired = false;
   let cancelFired = false;
   dialog.addEventListener('close', () => closeFired = true);
   dialog.addEventListener('cancel', () => cancelFired = true);
 
   dialog.removeAttribute('open');
+  assert_equals(document.activeElement, dialogbutton,
+    '<button> in <dialog> should still be focused immediately after removing open.');
   await new Promise(resolve => t.step_timeout(resolve, 0));
   await new Promise(requestAnimationFrame);
 
+  assert_equals(document.activeElement, button,
+    'Previously focused element should be focused after waiting for a task.');
   assert_false(cancelFired,
     'The cancel event should not fire when removing the open attribute.');
   assert_true(closeFired,