Fullscreen requires user interaction to initiate. It's a security feature.

Imagine if some pop-up could force you into fullscreen mode, lock your mouse pointer, and start playing an advertisement without your permission.

Fullscreen requires user interaction to initiate. It's a security feature.

Imagine if some pop-up could force you into fullscreen mode, lock your mouse pointer, and start playing an advertisement without your permission.

Having a 'enable full screen' link or button who's visibility is toggled in the document 'fullscreenchange' event handler seems like a practical approach.