diff -r 03e4aaa4ef3d -r 2f19d1449fba htmlpage/src/main/java/org/apidesign/bck2brwsr/htmlpage/api/Element.java
--- a/htmlpage/src/main/java/org/apidesign/bck2brwsr/htmlpage/api/Element.java	Mon Sep 24 15:06:43 2012 +0200
+++ b/htmlpage/src/main/java/org/apidesign/bck2brwsr/htmlpage/api/Element.java	Tue Sep 25 09:08:39 2012 +0200
@@ -29,4 +29,8 @@
     }
     
     abstract void dontSubclass();
+    
+    static void setAttribute(Element el, String property, Object value) {
+        throw new UnsupportedOperationException("Needs JavaScript!");
+    }
 }