Lazy screen - keep getting this

[JimbobVFR]

Is it just an issue with Chrome or do you get similar symptoms with other browsers or even playing video by other means.

The symptoms could relate to your graphics system (either the card or the driver) but I'd want to confirm it's not confined to just Chrome.

[chris285]

It's almost like you scrolled down the page, and it has loaded that to keep the video in focus and locked up

Facebook does the same in terms of the pop up for me and it's annoying

[dundarach]

Graphics driver or hardware acceleration perhaps.

Try using another browser first.

[Corso Marche]

A mate brought his Win 10 laptop around 1 week ago, with very similar symptoms. He couldn't leave it with me to investigate fully.

On his YouTube and Netflix would go to the same black video box and continue playing sound, as you describe. It was more prevalent when you go to full screen mode.
I cleared his account from Chrome, cleared all it's historic data, removed it, and reinstalled. The problem persisted after installation, and he had to leave, so I told him use Edge for YouTube and installed the Netflix app for him. Both methods worked.

What I did notice was the task manager showed the GPU jumping to 100% when video playback was started, and remaining at 100% even at just smaller in window playback.

I didn't have time to check if there are any bugs reported on Chrome 72 involving video, but the fact that Edge and the Netflix app both played the same videos without problem was pointing towards something not right with Chrome on his machine, which was some model of ASUS.

[audi321]

Check for Chrome updates in the settings.