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http://lists.w3.org/Archives/Public/www-style/2010Nov/0497.html
See also CSS4 Images, cross-fade() http://dev.w3.org/csswg/css4-images/Overview.src.html
Seems like we should postpone this to css4-images rather than try to address it in css3-transforms.
s/transforms/transitions. Agreed; this should be in cssN-images.