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Created an attachment (id=32515) [details]
CSS3 Multicolumn box occasionally becomes taller than the size of the children.
WebKit trunk renders the attached test case wrongly. The second block is taller than the other blocks, while all the blocks should have the same height.
Created an attachment (id=32516) [details]
See section 7 of CSS3 Multi-column spec.
This isn't an occasional or random thing. It can be reproduced with some regularity. I don't think this is a problem with columns per se, but something that webkit's implementation of columns draws more attention to. It really appears to be a font rendering issue. After twiddling the code, I notice that rendering of certain fonts magnifies the issue most.
Created an attachment (id=94074) [details]
Demonstration of why it doesn't appear to be solely a columnar rendering issue.