getHash( slide ) {

		let url = '/';

		// Attempt to create a named link based on the slide's ID
		let s = slide || this.Reveal.getCurrentSlide();
		let id = s ? s.getAttribute( 'id' ) : null;
		if( id ) {
			id = encodeURIComponent( id );
		}

		let index = this.Reveal.getIndices( slide );
		if( !this.Reveal.getConfig().fragmentInURL ) {
			index.f = undefined;
		}

		// If the current slide has an ID, use that as a named link,
		// but we don't support named links with a fragment index
		if( typeof id === 'string' && id.length ) {
			url = '/' + id;

			// If there is also a fragment, append that at the end
			// of the named link, like: #/named-link/2
			if( index.f >= 0 ) url += '/' + index.f;
		}
		// Otherwise use the /h/v index
		else {
			let hashIndexBase = this.Reveal.getConfig().hashOneBasedIndex ? 1 : 0;
			if( index.h > 0 || index.v > 0 || index.f >= 0 ) url += index.h + hashIndexBase;
			if( index.v > 0 || index.f >= 0 ) url += '/' + (index.v + hashIndexBase );
			if( index.f >= 0 ) url += '/' + index.f;
		}

		return url;

	}
Return a hash URL that will resolve to the given slide location.

@param {HTMLElement} [slide=currentSlide] The slide to link to