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Test Info:

<?xml version="1.0"?>
<?xml-stylesheet href="chrome://global/skin/global.css" type="text/css"?>
<toolbarbutton oncommand="++countera;" id="a">A</toolbarbutton>
<toolbarbutton oncommand="++counterb;" id="b">B</toolbarbutton>
<script>
//<![CDATA[
let aEl = document.getElementById('a');
let bEl = document.getElementById('b');
let countera = 0;
let counterb = 0;
aEl.addEventListener('click', function (aEvent) {
aEvent.preventDefault();
let cmdEvent = document.createEvent("xulcommandevent");
cmdEvent.initCommandEvent("command", true, true, window, 0,
aEvent.ctrlKey, aEvent.altKey, aEvent.shiftKey,
aEvent.metaKey, 0, null, aEvent.inputSource);
aEvent.currentTarget.dispatchEvent(cmdEvent);
});
bEl.addEventListener('click', function (aEvent) {
let cmdEvent = document.createEvent("xulcommandevent");
cmdEvent.initCommandEvent("command", true, true, window, 0,
aEvent.ctrlKey, aEvent.altKey, aEvent.shiftKey,
aEvent.metaKey, 0, null, aEvent.inputSource);
aEvent.currentTarget.dispatchEvent(cmdEvent);
});
bEl.click();
aEl.click();
is(countera, 1, "Counter should be one as event fires once");
is(counterb, 2, "Counter should be two as event fires twice");
//]]>
</script>
</window>