On 03/04/2013 08:20 PM, Boris Zbarsky wrote:
On 3/4/13 1:08 PM, Zack Weinberg wrote:
It only needs to be certain of seeing the event despite anything content
can do,

In that case, a capturing handler on the chrome event listener will work fine.

-Boris


or capturing or bubbling event listener in system event group.
http://mxr.mozilla.org/mozilla-central/source/content/events/public/nsIEventListenerService.idl#72
Listeners in system event group are called after the default group, but 
stop*Propagation
is per group. Listeners added by content js are only in the default group.


-Olli
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