sticky-dialog.html | Explore in Territory

<!DOCTYPE html>
<title>position:sticky computes to position:absolute</title>
<link rel="help" href="https://drafts.csswg.org/css-position-4/#top-styling">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<dialog style="position: sticky"></dialog>
<script>
test(() => {
  const dialog = document.querySelector('dialog');
  assert_equals(getComputedStyle(dialog).position, 'sticky');
  dialog.showModal();
  assert_equals(getComputedStyle(dialog).position, 'absolute');
}, 'Once in the top-layer position:sticky computes to position:absolute');
</script>

chromium/third_party/blink/web_tests/external/wpt/css/css-position/sticky-dialog.html