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chromium/third_party/blink/web_tests/html/selectlist/selectlist-typeahead-empty.html 

<!DOCTYPE html>
<p>
  Check that selectlist does not crash on search when it's empty.
</p>
<selectlist id="selectlist">
</selectlist>
<div id="result">Cannot run interactively.</div>
<script>
    if (window.testRunner) {
        testRunner.dumpAsText();
        var selectlist = document.getElementById("selectlist");
        selectlist.focus();
        eventSender.keyDown("z");
        eventSender.keyDown("z");
        eventSender.keyDown("z");
        eventSender.keyDown("z");
        eventSender.keyDown("z");
        eventSender.keyDown("z");
    }
</script>