[whatwg] should we add beforeload/afterload events to the web platform?

[Boris Zbarsky]

On 1/11/12 6:59 AM, Simon Pieters wrote:
> http://software.hixie.ch/utilities/js/live-dom-viewer/saved/1297
>
> Might not be cross-browser yet (e.g. Opera seems to run the image's
> onload handler), but should work per spec I think. Well, the load can't
> be prevented if it's speculatively loaded it before the script has
> executed, but maybe that's fine for the use case.

This also doesn't prevent rendering (which can easily start before 
DOMContentLoaded), doesn't prevent execution of script in the document 
that's being loaded, etc.

Again, the hard part of doing a transformation on HTML is not doing the 
transformation; it's preventing the transformation source document from 
being treated "as usual".

-Boris