thanks.

:-)
\Boris Zbarsky wrote:
> Kenny YU wrote:
>> I've observed that nsPresShell actually implements
>> nsIMutationObserver interface but I don't know what is its
>> corresponding Notifier which dispatches such event notification?
> 
> Mutation observers are notified via nsNodeUtils.  The places that call 
> nsNodeUtils are the various places where mutations happen.
> 
> -Boris
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