Jonathan wrote:
> I have a question about  BindToTree() in nsHTMLImageElement.
> What is it trying to do?

Handle the situation when the bind changes the image's base URI, as the 
comments 
say....

> And under what situation that the 'nsIDocument* aDocument' is null.

When the image is being added as a child of a node that's not in a document at 
the moment.

-Boris
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