Detecting if a browser is in full screen mode

Question

Is there any way of reliably detecting if a browser is running in full screen mode? I\'m pretty sure there isn\'t any browser API I can query, but has anyone worked it out b

Answer 1

What about determining the distance between the viewport width and the resolution width and likewise for height. If it is a small amount of pixels (especially for height) it may be at fullscreen.

However, this will never be reliable.