UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.79 Safari/537.36

Steps to reproduce the problem:
1. Run the attached code in Android on a Chromebook
2. Pin the app
3. Press CTRL+W or CTRL+SHIFT+W

What is the expected behavior?
The app window will close

What went wrong?
The app unpins and the window closes but the entire screen goes black

Did this work before? N/A 

Does this work in other browsers? Yes

Chrome version: 66.0.3359.158  Channel: stable
OS Version: 66.0.3359.158
Flash Version:
 

Deleted: screen pinning.zip 72.7 KB

screen pinning.zip 72.7 KB Download