Document is not notified about event listener changes 
https://bugs.webkit.org/show_bug.cgi?id=33861
Summary Document is not notified about event listener changes
Nikolas Zimmermann
Reported 2010-01-19 13:19:51 PST
Document keeps track wheter a certain event listener is available in the DOM, we only dispatch certain events if document()->hasListenerType(..) returns true. In Node::addEventListener, we're adding the listener type, but in Node::removeEventListener we're not notifying the Document that something changed. We need to switch to a counting based tracking scheme, counting how many event listeners are registered for each event type. This bug can introduce performance problems, when adding a mutation event listener once for ie. <body> and then removing it. We will never stop dispatching mutation events.
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Add attachment proposed patch, testcase, etc.
Alexey Proskuryakov
Comment 1 2012-08-28 09:45:32 PDT
Does this happen on real web sites? Counting listeners would add a toll on every web site, while benefits seem unlikely to materialize.
Lucas Forschler
Comment 2 2019-02-06 09:02:44 PST
Mass moving XML DOM bugs to the "DOM" Component.
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