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chromium/third_party/blink/web_tests/fast/forms/select/select-change-type-on-focus.html 

<!DOCTYPE html>
<script src="../../../resources/js-test.js"></script>
<div tabindex="04">
<select onfocus="this.size = 10">
<optgroup tabindex="20"></optgroup>
</select>
<script>
description('Check if select type change on focus doesn\'t cause crash.');
if (!window.eventSender)
    debug('Requires DRT/WRT.');
eventSender.keyDown('\t');
eventSender.keyDown('\t');
eventSender.keyDown(' ');
testPassed('if not crashed');
</script>
</div>