} else {
var parts = rfxnum.exec(val),
- start = e.cur() || 0;
+ start = e.cur();
if ( parts ) {
var end = parseFloat( parts[2] ),
return this.elem[ this.prop ];
}
- var r = parseFloat( jQuery.css( this.elem, this.prop ) );
- return r || 0;
+ var parsed,
+ r = jQuery.css( this.elem, this.prop );
+ // Empty strings, null, undefined and "auto" are converted to 0,
+ // complex values such as "rotate(1rad)" are returned as is,
+ // simple values such as "10px" are parsed to Float.
+ return isNaN( parsed = parseFloat( r ) ) ? !r || r === "auto" ? 0 : r : parsed;
},
// Start an animation from one number to another