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chromium/third_party/blink/web_tests/fast/dom/shadow/hit-test-inside-shadow-root.html 

<!DOCTYPE html>
<span id="sub">
</span>
<del id="del">
    <i id="italic"></i>
</del>
<div id="div"></div>
<script>
    text = document.createTextNode('Text'); 
    italic.appendChild(text); 

    shadow = sub.attachShadow({mode: 'open'}); 
    shadow.appendChild(del); 

    // Take the text node out of the document
    section = document.createElement('div'); 
    section.appendChild(sub); 
    div.appendChild(text); 
</script>
<p>crbug.com/491844 Moving a node from inside a shadow-root to a detached tree should not crash when we hit-test it. Hover over 'Text' to test. </p>
<div id="result">Test passes if it does not crash.</div>
<script>
if (window.testRunner) {
    testRunner.dumpAsText();
    eventSender.mouseMoveTo(10, 10);
    eventSender.mouseDown();
    eventSender.mouseUp();
}
</script>