UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36

Steps to reproduce the problem:
Click anywhere on the white page when you open the "index.html" after that chrome will be forced to fullscreen. If you try to press "ESC" the chrome will go instantly back to fullscreen.

What is the expected behavior?
Chrome is stuck in a full screen mode.

What went wrong?
There should be a protection how many times "Fullscreen" can be triggered in some time limit.

Did this work before? N/A 

Chrome version: 55.0.2883.87  Channel: stable
OS Version: 10.0
Flash Version: Shockwave Flash 24.0 r0

Here is a video about the vulnerability: https://www.youtube.com/watch?v=L6Xr2wfxm4c

I consider this is a very high threat vulnerability as you can take control of someone else's browser.
 

Deleted: index.html 2.1 KB

index.html 2.1 KB View Download