anchor.diff:  /// Virtual DOM Text Input Element
   class VTextInput extends VElementBase<html.InputElement> {
     final String _value;
  +  final String placeholder;
  +  final bool autofocus;
   
     String get value => ref.value;
   
     VTextInput({
       Object key,
       String value,
  +    this.placeholder,
  +    this.autofocus,
       String id,
       Map<String, String> attributes,
       List<String> classes,
  
positive.code: VTextInput textInput({
    Object key,
    String value,
    String id,
    Map<String, String> attributes,
    List<String> classes,
  
negative.code:   return new VTextInput(
        key: key,
        value: value,
        placeholder: placeholder,
        autofocus: autofocus,
        id: id,
        attributes: attributes,
        classes: classes,
  