beforematch-infinite-loop.html

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This WPT test may be referenced by the following Test IDs:
- /html/editing/the-hidden-attribute/beforematch-infinite-loop.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<link rel=author href="mailto:jarhar@chromium.org">

<link rel=help href="https://github.com/whatwg/html/issues/11436">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<div id=h1 hidden=until-found>

  <div id=h1child>hidden 1</div>

</div>

<div id=h2 hidden=until-found>hidden 2</div>

<script>

test(() => {

  let beforematchFired1 = false;

  let beforematchFired2 = false;

  h1.addEventListener('beforematch', () => {

    beforematchFired1 = true;

    h2.appendChild(h1);

});

  h2.addEventListener('beforematch', () => {

    beforematchFired2 = true;

});

  window.location.hash = '#h1child';

  assert_true(beforematchFired1, 'beforematch should have been fired on h1.');

  assert_false(beforematchFired2, 'beforematch should not have been fired on h2.');

  assert_false(h1.hasAttribute('hidden'), 'h1 should not be hidden.');

  assert_true(h2.hasAttribute('hidden'), 'h2 should be hidden.');

}, 'hidden=until-found revealing algorithm should collect elements to reveal before revealing them.');

</script>