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chromium/third_party/blink/web_tests/editing/execCommand/crash-on-plaintext-createLink.html 

<!DOCTYPE html>
<html>
<head>
    <title>Crash on "createLink" execCommand with plaintext-only</title>
    <script>
        if (window.testRunner)
            testRunner.dumpAsText();
    </script>
</head>
<body contentEditable>&nbsp;
    <div contentEditable="plaintext-only">PASS if the browser did not crash.</div>
    <script>
        document.execCommand("selectAll");
        document.execCommand("createLink", false, ".");
    </script>
</body>
</html>