robnyman

if (document.exitFullscreen) {
    document.exitFullscreen();
}
else if (document.mozCancelFullScreen) {
    document.mozCancelFullScreen();
}
else if (document.webkitCancelFullScreen) {
    document.webkitCancelFullScreen();
}
else if (document.msExitFullscreen) {

robnyman

var docElm = document.documentElement;
if (docElm.requestFullscreen) {
    docElm.requestFullscreen();
}
else if (docElm.mozRequestFullScreen) {
    docElm.mozRequestFullScreen();
}
else if (docElm.webkitRequestFullScreen) {
    docElm.webkitRequestFullScreen();
}