CSS3 Webkit Full Screen Detection Not Working

I think this has something to do with you pressing F11 to get fullscreen. You need to trigger the fullscreen via webkitRequestFullscreen and the other cross-browser versions of this. Also, I think that the CSS doesn't apply to the body. Try to use a wrapper and apply it to that element:

document.getElementById('gofullscreen').addEventListener('click', function() {
  var elem = document.getElementsByTagName("body")[0];
  elem.webkitRequestFullscreen();
  if (elem.requestFullscreen) {
    elem.requestFullscreen();
  } else if (elem.msRequestFullscreen) {
    elem.msRequestFullscreen();
  } else if (elem.mozRequestFullScreen) {
    elem.mozRequestFullScreen();
  } else if (elem.webkitRequestFullscreen) {
    elem.webkitRequestFullscreen();
  }
});
html,
body {
  width: 100%;
  height: 100%;
}

#wrapper {
  height: 100%;
  width: 100%;
}

 :-webkit-full-screen #wrapper {
  color: red;
  background: red;
}
<div id="wrapper">
  <a href="#" id="gofullscreen">fullscreen</a>
</div>

See Fiddle and Fullscreen version (Use the Fiddle link to see the code and the Fullscreen version to see it working, Fiddle doesn't allow fullscreen I think).

But the :-webkit-full-screen and the like are experimental, so don't rely on it. https://developer.mozilla.org/en-US/docs/Web/Guide/API/DOM/Using_full_screen_mode

Tags:

Html

Css

Webkit

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