anchor.diff:        classes: classes);
   }
   
  -VElement head({Object key,
  -     String id,
  -     List<VNode> children,
  -     Map<String, String> attributes,
  -     Map<String, String> styles,
  -     List<String> classes}) {
  -  return new VElement('head',
  -      key: key,
  -      id: id,
  -      children: children,
  -      attributes: attributes,
  -      styles: styles,
  -      classes: classes);
  -}
  -
   VElement h1({Object key,
        String id,
        List<VNode> children,
  
positive.code:      Map<String, String> styles,
       List<String> classes}) {
    return new VElement('menu',
        key: key,
        id: id,
        children: children,
        attributes: attributes,
        styles: styles,
        classes: classes);
  }
  
  VElement meta({Object key,
       String id,
       List<VNode> children,
       Map<String, String> attributes,
       Map<String, String> styles,
       List<String> classes}) {
    return new VElement('meta',
        key: key,
        id: id,
        children: children,
  
negative.code:       classes: classes);
  }
  
  VElement button({Object key,
       String id,
       List<VNode> children,
  