Fullscreen Utilities

gistfile1.js

function canFullScreen() {
  return document.body.webkitRequestFullScreen ||
         document.body.requestFullScreen ||
         document.body.mozRequestFullScreen;
}

function isFullScreen() {
  return document.fullScreenElement ||
         document.mozFullScreen ||
         document.webkitIsFullScreen;
}

function goFullScreen(elem) {
  if (elem.requestFullScreen) {
    elem.requestFullScreen();
  } else if (elem.mozRequestFullScreen) {
    elem.mozRequestFullScreen();
  } else if (elem.webkitRequestFullScreen) {
    elem.webkitRequestFullScreen();
  }
}

function cancelFullScreen() {
  if (document.cancelFullScreen) {
    document.cancelFullScreen();
  } else if (document.mozCancelFullScreen) {
    document.mozCancelFullScreen();
  } else if (document.webkitCancelFullScreen) {
    document.webkitCancelFullScreen();
  }
}