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chromium/third_party/blink/web_tests/external/wpt/html/semantics/forms/the-selectlist-element/selectlist-listbox-fallback-change-crash.tentative.html 

<!doctype html>
<html class="test-wait">
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1400522">
<link rel="author" href="mailto:[email protected]">

<selectlist id="selectList" style="position: absolute;">
    <div slot="button">
        <button id="b1" behavior="button"></button>
    </div>
    <selectlist>
        <div slot="button">
            <button id="b2" behavior="button">x</button>
        </div>
        <div id="listbox" popover slot="listbox" behavior="listbox">
            <option>y</option>
        </div>
    </selectlist>
</selectlist>

<script type="module">
    const raf = () => new Promise(resolve => requestAnimationFrame(resolve));

    document.querySelector('#b1').click();
    document.querySelector('#b2').click();

    document.querySelector('#selectList').style.top = '-25px';

    await raf();
    await raf();

    document.querySelector('#selectList').style.top = '0px';

    document.documentElement.classList.remove('test-wait');
</script>
</html>