chromium/src/third_party/blink/web_tests/fast/forms/select/select-accesskey.html

<select accesskey='a'
    onfocus='document.getElementById("res1").innerHTML="PASS 1";'
    onclick='document.getElementById("res2").innerHTML="PASS 2";'>
<option>blaa
<option>jee
</select>
Press Ctrl-Option-A (or Alt-A on Windows) to activate the select. Works as layout test too using eventSender.

<div>
focus event:
<div id=res1>
FAIL
</div>
click event:
<div id=res2>
FAIL
</div>
<script>
if (window.eventSender) {
    testRunner.dumpAsText();
    eventSender.keyDown('a', 'accessKey');
}
</script>