anchor.diff:      }
       
       save() {
  -      this.ownerDocument.cookie = Uri.encodeComponent(this.name) + '=' + Uri.decodeComponent(this.value) + this.prepareProperties();
  +      document.cookie = Uri.encodeComponent(this.name) + '=' + Uri.decodeComponent(this.value) + this.prepareProperties();
       }
     }
positive.code:     }
      
      Iterable _parseCookie() {
       List pairs = this.ownerDocument.cookie.split(r'/\s*;\s*/');
        var map = pairs.map((kv) {
          
          var eq = kv.indexOf('=');
  
negative.code: 
  library polymer_elements.cookie;
  
  import 'dart:html';
  import 'package:polymer/polymer.dart';
  
    var EXPIRE_NOW = 'Thu, 01 Jan 1970 00:00:00 GMT';
  