Chrome does support full screen mode, you're right. Most browsers do... actually all the latest versions, except for iOS safari and Opera Mini.

However some browsers may decide to block your page going fullscreen, unless it's a user-initiated action. What this means, is that you need to place your wade.setFullScreen call inside an onMouseUp function, or or otherwise call it in response to an onMouseUp event.

You could add a full screen button to your game, for example, and when the button is clicked you go full-scree