Support 'Conditional' idl attribute.

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

 
 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;";
 
   _DOMTokenListJs get classList() native "return this.classList;";
@@ skipping 25 matching lines @@
   String get innerHTML() native "return this.innerHTML;";
 
   void set innerHTML(String value) native "this.innerHTML = value;";
 
   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 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;";
-
-  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;";
 
   void set outerHTML(String value) native "this.outerHTML = value;";
 
   String get outerText() native "return this.outerText;";
 
@@ skipping 14 matching lines @@
   String get webkitdropzone() native "return this.webkitdropzone;";
 
   void set webkitdropzone(String value) native "this.webkitdropzone = value;";
 
   _ElementJs insertAdjacentElement(String where, _ElementJs element) native;
 
   void insertAdjacentHTML(String where, String html) native;
 
   void insertAdjacentText(String where, String text) native;
 }