code: function( element, set ) {
  			var i = 0, length = set.length;
  			for ( ; i < length; i++ ) {
  				if ( set[ i ] !== null ) {
  					element.data( dataSpace + set[ i ], element[ 0 ].style[ set[ i ] ] );
  				}
  			}
  		}
docs: Saves a set of properties in a data storage