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Created an attachment (id=40217) [details]
We should consider if it is a good idea to add a complementary API to the ClientRect/ClientRectList (getClientRects/getBoundingClientRect) APIs that returns quads to better deal with transforms. I have tentatively called the new types WebKitClientQuad/WebKitClientQuadList and added Element.getClientQuads() and Range.getClientQuads().