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chromium/third_party/blink/web_tests/external/wpt/html/interaction/focus/the-autofocus-attribute/first-reconnected.html 

<!DOCTYPE html>
<meta charset="utf-8">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/utils.js"></script>

<input autofocus id="i1">
<input autofocus id="i2">
<script>
"use strict";

promise_test(async () => {
  const input1 = document.querySelector("#i1");
  const input2 = document.querySelector("#i2");
  input1.remove();
  input2.parentNode.insertBefore(input1, input2);

  await waitUntilStableAutofocusState();
  assert_equals(document.activeElement, input2);
}, 'The second autofocus element wins if the first autofocus element was ' +
   'disconnected and reconnected before flushing the autofocus candidates.');
</script>