sortAll() {

		this.Reveal.getHorizontalSlides().forEach( horizontalSlide => {

			let verticalSlides = queryAll( horizontalSlide, 'section' );
			verticalSlides.forEach( ( verticalSlide, y ) => {

				this.sort( verticalSlide.querySelectorAll( '.fragment' ) );

			}, this );

			if( verticalSlides.length === 0 ) this.sort( horizontalSlide.querySelectorAll( '.fragment' ) );

		} );

	}
Sorts and formats all of fragments in the
presentation.