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

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

 
-class HTMLElementJs extends ElementJs implements HTMLElement native "*HTMLElement" {
+class _HTMLElementJs extends _ElementJs implements HTMLElement native "*HTMLElement" {
 
   String get accessKey() native "return this.accessKey;";
 
   void set accessKey(String value) native "this.accessKey = value;";
 
-  HTMLCollectionJs get children() native "return this.children;";
+  _HTMLCollectionJs get children() native "return this.children;";
 
-  DOMTokenListJs get classList() native "return this.classList;";
+  _DOMTokenListJs get classList() native "return this.classList;";
 
   String get className() native "return this.className;";
 
   void set className(String value) native "this.className = value;";
 
   String get contentEditable() native "return this.contentEditable;";
 
   void set contentEditable(String value) native "this.contentEditable = value;";
 
   String get dir() native "return this.dir;";
@@ skipping 19 matching lines @@
   String get innerText() native "return this.innerText;";
 
   void set innerText(String value) native "this.innerText = value;";
 
   bool get isContentEditable() native "return this.isContentEditable;";
 
   String get itemId() native "return this.itemId;";
 
   void set itemId(String value) native "this.itemId = value;";
 
-  DOMSettableTokenListJs get itemProp() native "return this.itemProp;";
+  _DOMSettableTokenListJs get itemProp() native "return this.itemProp;";
 
-  DOMSettableTokenListJs get itemRef() native "return this.itemRef;";
+  _DOMSettableTokenListJs get itemRef() native "return this.itemRef;";
 
   bool get itemScope() native "return this.itemScope;";
 
   void set itemScope(bool value) native "this.itemScope = value;";
 
-  DOMSettableTokenListJs get itemType() native "return this.itemType;";
+  _DOMSettableTokenListJs get itemType() native "return this.itemType;";
 
   Object get itemValue() native "return this.itemValue;";
 
   void set itemValue(Object value) native "this.itemValue = value;";
 
   String get lang() native "return this.lang;";
 
   void set lang(String value) native "this.lang = value;";
 
   String get outerHTML() native "return this.outerHTML;";
@@ skipping 13 matching lines @@
   void set tabIndex(int value) native "this.tabIndex = value;";
 
   String get title() native "return this.title;";
 
   void set title(String value) native "this.title = value;";
 
   String get webkitdropzone() native "return this.webkitdropzone;";
 
   void set webkitdropzone(String value) native "this.webkitdropzone = value;";
 
-  ElementJs insertAdjacentElement(String where, ElementJs element) native;
+  _ElementJs insertAdjacentElement(String where, _ElementJs element) native;
 
   void insertAdjacentHTML(String where, String html) native;
 
   void insertAdjacentText(String where, String text) native;
 }