Firing events at the window vs. firing them at the chrome event handler

[Zack Weinberg]

If an event is dispatched from C++ using 
nsContentUtils::DispatchTrustedEvent with both the 'bubbles' and 
'cancelable' flags set false, what precisely is the difference between 
targeting it at a document's window and targeting it at the document's 
window's chrome event handler?  In particular, if such an event is 
targeted at the window, is there any circumstance in which a handler 
registered from chrome JS on gBrowser will *not* get a crack at it?

zw
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