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chromium/third_party/blink/web_tests/dom/mutation-event-tests/editing/execCommand/5120591.html 

<!DOCTYPE html>
<p>Tests for a crash when creating a link inside a region with a subtree modified event listener.</p>
<div contenteditable="true" id="div">This should be a link.</div>

<script>

if (window.testRunner)
    testRunner.dumpAsText();

var div = document.getElementById("div");
div.addEventListener('DOMSubtreeModified', function () {;});
div.focus();
document.execCommand("SelectAll");
document.execCommand("CreateLink", false, "#");
</script>

PASS