function getSlide( x, y ) {

		let horizontalSlide = getHorizontalSlides()[ x ];
		let verticalSlides = horizontalSlide && horizontalSlide.querySelectorAll( 'section' );

		if( verticalSlides && verticalSlides.length && typeof y === 'number' ) {
			return verticalSlides ? verticalSlides[ y ] : undefined;
		}

		return horizontalSlide;

	}
Returns the slide element matching the specified index.

@return {HTMLElement}