UserAgent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3141.7 Safari/537.36

Steps to reproduce the problem:
1. watch a video
2. do not move your mouse or keyboard

What is the expected behavior?

What went wrong?
Other part of the webpage flashes sometimes.  may fix when move the mouse or type somting with the keyboard.

Did this work before? N/A 

Chrome version: 59.0.3071.115  Channel: beta
OS Version: 10.12.6
Flash Version: 

This issue is reported by my end users. It also happens when they use Chrome 57. 

I thought it may be a compositor problem??? Just guess..
 

Deleted: QQ短视频20170712121722.mp4 1.9 MB

	QQ短视频20170712121722.mp4 1.9 MB View Download