Detect fullscreen mode

Question

Modern desktop version of IE 10 is always fullscreen.

There is a living specification for :fullscreen pseudo-class on W3

But when I tried to det

Answer 1

In Safari on iPhone, webkitDisplayingFullscreen property will return true if is playing in fullscreen. Ref: https://developer.apple.com/documentation/webkitjs/htmlvideoelement/1630493-webkitdisplayingfullscreen