anchor.diff:  part 'src/null_tree_sanitizer.dart';
   
   /// Use this function to create instances from different sources.
  +///
   /// For example:
   ///
   ///     // creates a SPAN element
  
positive.code: library domelement;
  
  import 'dart:collection';
  
negative.code: }
  
  /// Finds an element from the current document.
  ///
  /// This function may return a null value if the element was not found.
  DomElement find(String selectors) {
    Element element = querySelector(selectors);
  