Could a website force the browser to go into fullscreen mode?

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You could just tell the user to press F11. Next to it, put a ‘why?’ link and explain why you feel like they need to be in fullscreen mode.

I don’t think you can force a browser to go full screen and, in fact, if you were able to do that I’d be furious at my browser. It’s too invasive. Even Flash has security so that forcing the plugin to go to fullscreen requires the event to originate with a user interaction. So, if it’s that important to you, this might be a good reason to use the Flash plugin because you could attach the go-fullscreen call to a misleading button that says ‘start quiz’ (or whatever).

But, please don’t do that. Just be straight forward with the user and tell them to hit F11.

EDIT: I just tried the sample code provided in another comment and I’m happy to say that Firefox opens up a maximized window with an address bar, not a fullscreen window.

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