I'd like us to come to a decision on bug 253851 [1].  Based on the information 
in that bug, I think we should block onload on background images.  This would 
allow us to simplify some code, fix the issue where a canvas DrawWindow can't 
be 
done onload and be guaranteed to get the "right" result, and give us IE compat.

The argument against seems to be that backgrounds don't affect sizing and so 
shouldn't block onload... but I'm not sure that should outweigh the issues that 
this behavior causes, especially given the way we prioritize requests (see bug 
253851 comment 42).

The patch to do what I propose above is really pretty simple, especially if we 
do the code cleanup it would allow separately.

Could we just decide something here?

-Boris

[1] https://bugzilla.mozilla.org/show_bug.cgi?id=253851
[2] https://bugzilla.mozilla.org/show_bug.cgi?id=253851#c42

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