function getSlidesAttributes() {

		return getSlides().map( slide => {

			let attributes = {};
			for( let i = 0; i < slide.attributes.length; i++ ) {
				let attribute = slide.attributes[ i ];
				attributes[ attribute.name ] = attribute.value;
			}
			return attributes;

		} );

	}
Returns an array of objects where each object represents the
attributes on its respective slide.