anchor.diff:            treeSanitizer: new NullTreeSanitizer());
         final attributes = element.attributes;
         expect(attributes['class'], 'foo');
  +      startsWith(match) => predicate((x) => x is String && x.startsWith(match));
         expect(attributes['style'], startsWith('overflow: hidden'));
         expect(attributes['data-foo'], 'bar');
         expect(attributes['data-foo2'], 'bar2');
  
positive.code: }
  
  void testUnsupported(String name, void f()) {
    test(name, () {
      expect(f, throwsUnsupportedError);
    });
  }
  
  main() {
  
negative.code: 
    group('constructors', () {
      test('error', () {
        Expect.throwsStateError(() => new Element.html('<br/><br/>'));
      });
  
      test('.html has no parent',
  