anchor.diff:    var testForm = new FormElement()..id = 'testForm';
     document.body.append(testForm);
   
  -  var isFormElement = (element) {
  +  var isFormControl = (element) {
       testForm.append(element);
       return element.form == testForm;
     };
  
positive.code:     expect(quxNewed.outerHtml, quxOuterHtml);
      expect(quxNewed is Qux, isTrue);
      expect(quxNewed is InputElement, isTrue);
      expect(isFormElement(quxNewed), isTrue);
  
      // new Element.tag
  
  
negative.code: 
      var fooBarCreated =
  	document.$dom_createElement(Foo.tag, Bar.tag);
      expect(fooBarCreated.outerHtml, '<x-foo is="x-bar"></x-foo>');
      expect(fooBarCreated is Foo, isTrue);
  
      var barFooCreated = document.$dom_createElement(Bar.tag,
  