function _getIndex( set, test ) {
			var i, result, element;

			for( i = result = 0; i < set.length; i++ ) {
				element = set.item ? set.item(i) : set[i];

				if( test(element) ){
					return result;
				}

				// ignore text nodes, etc
				// NOTE may need to be more permissive
				if( element.nodeType === 1 ){
					result++;
				}
			}

			return -1;
		}
Gets or sets the `innerHTML` from all the elements in the set.

@param {string|undefined} html The html to assign
@return {string|shoestring}
@this shoestring