chromium/third_party/blink/web_tests/external/wpt/html/interaction/focus/the-autofocus-attribute/skip-not-fully-active.html

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

<iframe srcdoc="<input autofocus><script>window.frameElement.remove();</script>"></iframe>

<script>
'use strict';

promise_test(async () => {
  let iframe = document.querySelector('iframe');
  let iframeDocument = iframe.contentDocument;
  await waitForLoad(window);
  assert_not_equals(document.activeElement, iframe);
  assert_equals(iframeDocument.activeElement, iframeDocument.body);
}, 'Autofocus element in not-fully-active document should be skipped while flusing.');
</script>