Make dart:dom implementation types private so they don't muddle the docs.

client/dom/generated/src/frog/DOMSelection.dart

 
-class DOMSelectionJs extends DOMTypeJs implements DOMSelection native "*DOMSelection" {
+class _DOMSelectionJs extends _DOMTypeJs implements DOMSelection native "*DOMSelection" {
 
-  NodeJs get anchorNode() native "return this.anchorNode;";
+  _NodeJs get anchorNode() native "return this.anchorNode;";
 
   int get anchorOffset() native "return this.anchorOffset;";
 
-  NodeJs get baseNode() native "return this.baseNode;";
+  _NodeJs get baseNode() native "return this.baseNode;";
 
   int get baseOffset() native "return this.baseOffset;";
 
-  NodeJs get extentNode() native "return this.extentNode;";
+  _NodeJs get extentNode() native "return this.extentNode;";
 
   int get extentOffset() native "return this.extentOffset;";
 
-  NodeJs get focusNode() native "return this.focusNode;";
+  _NodeJs get focusNode() native "return this.focusNode;";
 
   int get focusOffset() native "return this.focusOffset;";
 
   bool get isCollapsed() native "return this.isCollapsed;";
 
   int get rangeCount() native "return this.rangeCount;";
 
   String get type() native "return this.type;";
 
-  void addRange(RangeJs range) native;
+  void addRange(_RangeJs range) native;
 
-  void collapse(NodeJs node, int index) native;
+  void collapse(_NodeJs node, int index) native;
 
   void collapseToEnd() native;
 
   void collapseToStart() native;
 
-  bool containsNode(NodeJs node, bool allowPartial) native;
+  bool containsNode(_NodeJs node, bool allowPartial) native;
 
   void deleteFromDocument() native;
 
   void empty() native;
 
-  void extend(NodeJs node, int offset) native;
+  void extend(_NodeJs node, int offset) native;
 
-  RangeJs getRangeAt(int index) native;
+  _RangeJs getRangeAt(int index) native;
 
   void modify(String alter, String direction, String granularity) native;
 
   void removeAllRanges() native;
 
-  void selectAllChildren(NodeJs node) native;
+  void selectAllChildren(_NodeJs node) native;
 
-  void setBaseAndExtent(NodeJs baseNode, int baseOffset, NodeJs extentNode, int extentOffset) native;
+  void setBaseAndExtent(_NodeJs baseNode, int baseOffset, _NodeJs extentNode, int extentOffset) native;
 
-  void setPosition(NodeJs node, int offset) native;
+  void setPosition(_NodeJs node, int offset) native;
 
   String toString() native;
 }