Google Chrome May Let Sites Block Your Screen from Powering Down

Google Chrome developers have added an intent to experiment with a feature that enables web applications to keep systems awake even in lack of mouse or keyboard activity.

This is to be achieved through the WakeLock API, which allows requesting a wake lock that prevents devices from entering a power-saving state by lowering the screen brightness, turning off the screen, or reduce CPU cycles.

https://www.bleepingcomputer.com/news/technology/google-chrome-may-let-sites-block-your-screen-from-powering-down/