anchor.diff:   */
   import "dart:html";
   import "../../testcommon.dart";
  -import "../../../Utils/async_utils.dart";
   
   main() {
     test(declaration, property) {
  
positive.code:     return result;
    }
  
    shouldBe(test("background-clip: -webkit-text", "background-clip"), "-webkit-text");
    shouldBe(test("background-clip: -webkit-text", "-webkit-background-clip"), '');
  
    shouldBe(test("background-clip: content-box", "background-clip"), "content-box");
  
negative.code:   shouldBe(test("background-clip: text", "-webkit-background-clip"), '');
  
    shouldBe(test("-webkit-background-clip: -webkit-text", "background-clip"), '');
  
    shouldBe(test("-webkit-background-clip: text", "background-clip"), '');
    shouldBe(test("background: url() padding-box", "-webkit-background-clip"), '');
  
    shouldBe(test("-webkit-mask: url() ", "background-clip"), '');
  