code: function() {
  		var t = this;
  		// Native events
  		if (zyMedia.features.nativeFullscreenPrefix != '-') {
  			// Chrome doesn't alays fire this in an iframe
  			var func = function(e) {
  				if (t.isFullScreen) {
  					if (!isInFullScreenMode()) {
  						t.exitFullScreen()
  					}
  				}
  			};
  
  			document.addEventListener(zyMedia.features.nativeFullscreenPrefix + 'fullscreenchange', func)
  		}
  
  		t.fullscreenBtn = document.createElement('div');
  		t.fullscreenBtn.className = 'zy_fullscreen_btn';
  		t.controls.appendChild(t.fullscreenBtn);
  
  		t.fullscreenBtn.addEventListener('click', function() {
  			if ((zyMedia.features.nativeFullscreenPrefix != '-' && isInFullScreenMode()) || t.isFullScreen) {
  				t.exitFullScreen()
  			} else {
  				t.enterFullScreen()
  			}
  		});
  	}
docs: Fullscreen button