chromium/third_party/blink/web_tests/external/wpt/html/interaction/focus/the-autofocus-attribute/document-with-fragment-empty.html

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/utils.js"></script>

<iframe src="resources/frame-with-autofocus-element.html#"></iframe>

<script>
'use strict';

promise_test(async () => {
  await waitForLoad(window);
  await waitUntilStableAutofocusState();
  assert_equals(document.activeElement, document.querySelector('iframe'),
      'Autofocus elements in iframes should be focused.');

  let input = document.createElement('input');
  input.autofocus = true;
  document.body.appendChild(input);
  await waitUntilStableAutofocusState();
  assert_not_equals(document.activeElement, input);
}, 'Autofocus elements in iframed documents with empty fragments should work.');

promise_test(async () => {
  let w = window.open('resources/frame-with-autofocus-element.html#');
  await waitForLoad(w);
  await waitUntilStableAutofocusState(w);
  assert_not_equals(w.document.activeElement, w.document.body);
  w.close();
}, 'Autofocus elements in top-level browsing context\'s documents with empty fragments should work.');
</script>