[Webkit-unassigned] [Bug 102663] New: [Shadow DOM]: Event listeners are invoked for events with the same target and relatedTarget

Mon Nov 19 01:41:50 PST 2012

https://bugs.webkit.org/show_bug.cgi?id=102663

           Summary: [Shadow DOM]: Event listeners are invoked for events
                    with the same target and relatedTarget
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Event Handling
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: sgrekhov at unipro.ru

According Shadow DOM specification (http://www.w3.org/TR/shadow-dom/#retargeting-related-target) "Event listeners must not be invoked on a DOM node for which the target and relatedTarget are the same.". But in fact it doesn't work. Please run the following example in Chrome (found in Chrome 23.0.1271.64 m):

<html>
<head>
<script type="text/javascript">
function test() {
    var d = document;
    var SR = window.ShadowRoot || window.WebKitShadowRoot;

    //Shadow root to play with
    var s = new SR(d.querySelector('#host'));

    var div1 = d.createElement('div');
    div1.setAttribute('style', 'height:50%; width:100%');
    div1.setAttribute('id', 'div1');
    s.appendChild(div1);

    div1.addEventListener('mouseover', function(event) {
        console.log('div1:Event listeners shouldn\'t be invoked if target and relatedTarget are the same');
    }, false);

    d.body.addEventListener('mouseover', function(event) {
        console.log('body:Event listeners shouldn\'t be invoked if target and relatedTarget are the same');
    }, false);

    var evt = document.createEvent("MouseEvents");
    evt.initMouseEvent("mouseover", true, false, window,
      0, 10, 10, 10, 10, false, false, false, false, 0, div1);

    div1.dispatchEvent(evt);
}
</script>
</head>
<body onload="test()">

<div id="host">
</div>

</body>
</html>

Observe JavaScript console. As you can see bot event listeners for div1 and body are invoked thorough event target and related target (see the last argument of initMouseEvent()) are the same (div1 for both)

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