I've got an HTML5 Unity game that I will present full-screen in browser. I will be implementing a pause menu to include things like game options, graphics options, etc. and I'd like for that menu to be triggered with the Escape key. Players would also be able to disable full-screen mode while in that menu.

Is there a way to have the Esc key not switch back to windowed mode when in full-screen?

I don't think browsers let this. It is a security risk.

I just had this problem with my game. Xentios is right, browsers OWN that key, sorry. I switched my pause menu functionality to Backspace instead.

Thank you both for the info!