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chromium/third_party/blink/web_tests/external/wpt/html/interaction/focus/the-autofocus-attribute/autofocus-on-stable-document.html 

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

<body>
<script>
'use strict';

promise_test(async t => {
  await waitForLoad(window);
  await timeOut(t, 1000);
  let element = document.createElement('input');
  element.autofocus = true;
  document.body.appendChild(element);
  await waitUntilStableAutofocusState();
  assert_equals(document.activeElement, element);
}, 'Autofocus should work if an element with autofocus is inserted into a ' +
    'document which was loaded some time ago.');
</script>
</body>