	/**
				 * Forward keyboard events to the current slide window.
				 * This enables keyboard events to work even if focus
				 * isn't set on the current slide iframe.
				 *
				 * Block F5 default handling, it reloads and disconnects
				 * the speaker notes window.
				 */
				function setupKeyboard() {

					document.addEventListener( 'keydown', function( event ) {
						if( event.keyCode === 116 || ( event.metaKey && event.keyCode === 82 ) ) {
							event.preventDefault();
							return false;
						