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    <p>events almost always bubble up unless event.cancelBubble=true is set or event.stopPropagation() is used. You are only aware of it, though, when one of your event handlers gets tripped.</p> <p>See <a href="http://en.wikipedia.org/wiki/DOM_events" rel="noreferrer">http://en.wikipedia.org/wiki/DOM_events</a> for a list of events which bubble. (Note: in the table of HTML events, cancelable refers to the effectiveness of event.preventDefault() or return false to cancel the default action, not bubbling)</p> <p>Also see <a href="http://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-flow" rel="noreferrer">http://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-flow</a>, in particular 1.2.1 Basic Flow to understand the capture phase and bubbling phase of event propagation.</p> <p><strong>EDIT</strong></p> <p><a href="http://mark-story.com/posts/view/speed-up-javascript-event-handling-with-event-delegation-and-bubbling" rel="noreferrer">http://mark-story.com/posts/view/speed-up-javascript-event-handling-with-event-delegation-and-bubbling</a> suggests there <em>is</em> a performance gain by stopping propagation but provides no data. </p> <p><a href="http://groups.google.com/group/Google-Web-Toolkit/browse_thread/thread/a9af0aa4216a8046" rel="noreferrer">http://groups.google.com/group/Google-Web-Toolkit/browse_thread/thread/a9af0aa4216a8046</a> suggests that browsers should be optimized for bubbling behaviour and says there should be no significant performance difference. Again no data.</p> <p><a href="http://developer.yahoo.com/performance/rules.html#events" rel="noreferrer">http://developer.yahoo.com/performance/rules.html#events</a> provides a good technique for improving event-handling performance, but doesn't directly talk about stopPropagation performance.</p> <p>Ultimately, you'd have to profile the difference to get a good idea of the benefits on your site.</p>
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    1. USJonathan Fingland
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    1. COThanks Jonathan. Do you know if there are there any performance gains by stopping propagation all the time?
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    2. COnot that I'm aware of. Generally bubbling is the expected behaviour, and as such I would suspect browsers would be optimized for that behaviour. I'll see what I can dig up.
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    3. COThanks for your lengthy post Jonathan. I will do some more digging starting at your suggested links. Thanks again.
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