Background/element goes black when entering Fullscreen with HTML5

Question

I'm using the following script to make my web app go fullscreen...

function enterFullscreen(){
    var element = document.getElementById('container');
    if (element.mozRequestFullScreen) {
        element.mozRequestFullScreen();
    } else if (element.webkitRequestFullScreen) {
        element.webkitRequestFullScreen();
    }
    l('Fullscreen Mode entered','internal');
}

And so, when I click the trigger button via $('button.toggle-fullscreen').click(function(){ enterFullscreen(); }); I do in fact enter fullscreen, only my element goes black. Just black, nothing else.

Anyone know how to fix this?

FYI I'm using Chrome 27.

Answer 1

The default background color of the browser's full-screen "visual environment" is black. Your content actually is there, but it's currently black text on black background, so you can't see it (try highlighting or pressing Ctrl+A to see for yourself).

If you want to make the background a different color, you must specify a CSS rule to set the background-color property to something other than the default. So, in your case:

#container:fullscreen {
    background-color: rgba(255,255,255,0);
}
#container:-webkit-full-screen {
    background-color: rgba(255,255,255,0);
}
#container:-moz-full-screen {
    background-color: rgba(255,255,255,0);
}

should do the trick. (Make sure you use the appropriate vendor version(s) -- :-webkit-full-screen and :-moz-full-screen -- until the spec finalizes; see MDN for more information.)

In fact, maybe just

*:fullscreen, *:-webkit-full-screen, *:-moz-full-screen {
    background-color: rgba(255,255,255,0);
}

EDIT by @DevilishDB: used rgba for a transparent BG and added the * selector to make the previous thing work