startEmbeddedMedia( event ) {

		let isAttachedToDOM = !!closest( event.target, 'html' ),
			isVisible  		= !!closest( event.target, '.present' );

		if( isAttachedToDOM && isVisible ) {
			// Don't restart if media is already playing
			if( event.target.paused || event.target.ended ) {
				event.target.currentTime = 0;
				event.target.play();
			}
		}

		event.target.removeEventListener( 'loadeddata', this.startEmbeddedMedia );

	}
Starts playing an embedded video/audio element after
it has finished loading.

@param {object} event