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Created an attachment (id=156918) [details]
A MathJax user reported that the HTML+CSS code generated by MathJax to display mathematical formulas is not rendered correctly in Webkit when scaled inside SVG:
The code generated by MathJax contains many <span>'s and it's hard to say what the problem is. However, I think I have isolated one issue with <span style="display: inline-block; position: relative;">, which are used everywhere in the generated code.
In the attached testcase, such a span is used to draw a 50x50 red rectangle. I use SVG to scale it by a factor of 2. In Firefox, it thus fits in the 100x100 black frame. However in Webkit this rectangle is still rendered with a size of 50x50. Note that if you use "position: static;", it is correctly scaled.
Of course, this affects both coordinates and size. You can try to use "left: 25px; top: 25px; width: 25px; height: 25px;" in the testcase.
Created an attachment (id=174887) [details]
Another test case.
This bug prevents the use of Closure UI widgets in SVG. Attached is an independently created testcase. Works fine in Gecko.
SVG trees don't have RenderLayers. It's a loooong standing bug. :(