anchor.diff:  }
   
   /// Find changes between maps [a] and [b] and apply this changes to CssStyleDeclaration [n].
  -void _updateStyle(Map a, Map b, html.CssStyleDeclaration n) {
  +void updateStyle(Map a, Map b, html.CssStyleDeclaration n) {
     if (a != null && a.length > 0) {
       if (b == null || b.length == 0) {
         // all keys removed
  
positive.code: }
  
  /// Find changes between Lists [a] and [b] and apply this changes to Set [n].
  void _updateSet(List a, List b, Set n) {
    if (a != null && a.length > 0) {
      if (b == null || b.length == 0) {
        n.removeAll(a);
  
negative.code: }
  
  /// Find changes between maps [a] and [b] and apply this changes to map [n].
  void updateAttrs(Map a, Map b, Map n) {
    if (a != null && a.length > 0) {
      if (b == null || b.length == 0) {
        // all keys removed
  