Reduced case attached. chrishtr@ could you take a look to see if it's paint related?

Deleted: clipped-blur.html 196 bytes

clipped-blur.html 196 bytes View Download

Ali, is this something to do with filters that move pixels?

I updated the title to be more general and less confusing.

We have the same bug with drop shadow, so I guess it's related to filters moving pixels.

Drop shadow? That's not a filter. What example are you looking at?

Testing on retina Mac, this renders correctly with software compositing but not with GPU compositing, which makes me think there's a bug in GLRenderer when applying the filter.

The logic for handling expansion due to filters when computing render surface content rects is the same for software and GPU, so I don't think this is a bug in that logic, but it could be a bug in GLRenderer's handling of pixel-moving filters.

Drop shadow is indeed a filter. Maybe you're thinking of box shadow?

Ah yes, sorry.

Seems to be GPU rasterization.

As a note, if I add translateZ(-100px) before the rotation, the div appears correctly, whereas translateZ(100px) causes it to disappear altogether. Seems like a clipping issue. 

This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

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I can no longer reproduces the bug. Mark it as WontFix now.