The previous implementation of perspectives in GraphicsLayerQt was slightly inaccurate; That can be seen as when browsing the above URL, the input (mouse) is not in sync with the screen.
Created attachment 49263 [details] Take I
Comment on attachment 49263 [details] Take I Merging this with work on preserves-3d / backface-visibility, see https://bugs.webkit.org/show_bug.cgi?id=35312
Comment on attachment 49263 [details] Take I replaced by 35382
*** This bug has been marked as a duplicate of bug 35382 ***