user/test/com/google/gwt/resources/client/gss/mixin.gss - gwt - Git at Google

 @defmixin size(WIDTH, HEIGHT) {
   width: WIDTH;
   height: HEIGHT;
 }

 .someClass {
   @mixin size(120px, 100px);
 }
	@defmixin size(WIDTH, HEIGHT) {
	width: WIDTH;
	height: HEIGHT;
	}

	.someClass {
	@mixin size(120px, 100px);
	}