UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36

Steps to reproduce the problem:
1. Open the attached main.html file
2. Open console log in a separate window
3. Click the button on the webpage to open a popout window
4. Observe the log, the popout has focus and the main window does not
5. Click the button in the popout to enter fullscreen
6. Observe the log, the popout still has focus and the main window does not
7. Click the button in the popout to exit fullscreen
8. Observe the log, the main window got an onFocus event
9. Observe the log, both the main window and the popout window seems to be focused

What is the expected behavior?
8. Did not expect to get an onFocus event in the main window, since focus is on the popout all the time
9. Did not expect that both the main window and the popout window report being in focus

What went wrong?
Both the main window and the popout window are in focus

Did this work before? Yes 68

Does this work in other browsers? Yes

Chrome version: 69.0.3497.100  Channel: stable
OS Version: OS X 10.12.6
Flash Version: 

This reproduces 100% on my mac.

My colleague has the exact same hardware, but on his mac the problem manifests itself slightly different. He gets the unexpected onFocus event already when entering fullscreen. This also reproduces 100%.