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chromium/third_party/blink/web_tests/external/wpt/html/obsolete/requirements-for-implementations/the-marquee-element-0/marquee-overflow.html 

<!doctype html>
<meta charset="utf-8">
<title>Marquee forces overflow: hidden</title>
<link rel="help" href="https://html.spec.whatwg.org/#the-marquee-element">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<marquee style="overflow: visible">&nbsp;</marquee>
<marquee style="overflow: scroll">&nbsp;</marquee>
<marquee style="overflow: clip">&nbsp;</marquee>
<marquee style="overflow: auto">&nbsp;</marquee>

<script>
test(() => {
  for (let m of document.querySelectorAll("marquee")) {
    assert_equals(getComputedStyle(m).overflow, "hidden", m.style);
  }
}, "Marquee should have overflow: hidden !important in the UA stylesheet");
</script>