UserAgent: Mozilla/5.0 (X11; CrOS x86_64 9592.71.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.80 Safari/537.36
Platform: 9592.71.0 (Official Build) stable-channel caroline Firmware

Steps to reproduce the problem:
1. open one popup dialog
2. move mouse over the button in the dialog

What is the expected behavior?
There is no shadow

What went wrong?
There is shadow on the backgound

Did this work before? N/A 

Chrome version: 60.0.3112.80  Channel: stable
OS Version: 9592.71.0
Flash Version: Shockwave Flash 26.0 r0

I have only one Chromebook with Android 7.0.

I am not sure it's device specific or Chromebook with Android 7.0 specific issue.
 

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