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The event behavior of speak(), pause(), and resume() is pretty clear. But what happens when cancel() is called? onend? onerror? Perhaps there is room for another event. Maybe the utterances in the queue that have never started should have an event fire on them too. http://lists.w3.org/Archives/Public/public-speech-api/2013Feb/0007.html
*** This bug has been marked as a duplicate of bug 21049 ***