How does YouTube prevent the screensaver from showing up during video playback? (Windows)

Question

I have noticed that mi screensaver doesn\'t start while I\'m watching videos on YouTube. I\'m using Windows 7.

This is the test:

1. Set Windows screensave

Answer 1

It looks like a Microsoft bug, as mentined below, you can make your presentation in a browser to prevent screensaver. Hope this link helps.

From Issue 9853: Display blanking fails when Chrome has focus:

Comment 8 by *ida...@chromium.org, May 21, 2009
Took some time to look at this and I can confirm that it is easily reproducible and the Chrome does not do anything to affect Windows power management. It really looks like a Microsoft bug which is clearly triggered by Chrome having focus.

To be clear what actually happens is that the 'Display-blanking' power-state does not trigger while Chrome has focus, all other power-states (Suspend, Hibernate) trigger. The screen saver also triggers.