leonid.stashevsky@ : Thanks for the report, could you please help provide more descriptions about the issue along with the OS and Chrome version details to further triage it.

mac osx 10.11, chrome 54.0.2787.0 canary (64-bit)

I have external 1080p montior, and many sites looks broken
White rectangles appears, looks like css doesn't working right

Deleted: Screenshot at Jul 04 09-59-13.png 176 KB

	Screenshot at Jul 04 09-59-13.png 176 KB View Download

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Thanks for the feedback.Could you please help with the sites and the repro steps where the issue is seen(highlight it) to help further.

https://www.codewars.com/dashboard

Right white rectangle not visible in stable version of Chrome.
At vk.com white rectangles appears on both sides.

Thank you for providing more feedback. Adding requester "durga.behera@chromium.org" for another review and adding "Needs-Review" label for tracking.

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Hi, thanks for reporting the issue. 

I was unable to reproduce the problem, but if you have the time to try a couple of things and take screenshots for codewars.com/dashboard, it would be very helpful.

First, can you try updating Chrome Canary to see if the problem has gone away? There was a similar problem recently: https://bugs.chromium.org/p/chromium/issues/detail?id=625213 (sorry, the bug incorrectly has restricted access - a bug in our bug tracking system).

If the problem persists, can you try launching with the flag "--disable-mac-overlays" to see if the problem goes away? If it persists, can you remove that flag and try launching with "--show-composited-layer-borders" and take a screenshot of the result?

Seems like Issue # 624256. Please reopen if the issue is still occurring in the latest Canary.