diff --git a/Ooui.Forms/Renderers/ActivityIndicatorRenderer.cs b/Ooui.Forms/Renderers/ActivityIndicatorRenderer.cs
new file mode 100644
index 0000000..8f7373c
--- /dev/null
+++ b/Ooui.Forms/Renderers/ActivityIndicatorRenderer.cs
@@ -0,0 +1,10 @@
+using System;
+namespace Ooui.Forms.Renderers
+{
+    public class ActivityIndicatorRenderer
+    {
+        public ActivityIndicatorRenderer ()
+        {
+        }
+    }
+}
diff --git a/Ooui/Client.js b/Ooui/Client.js
index 108fc35..e796069 100644
--- a/Ooui/Client.js
+++ b/Ooui/Client.js
@@ -84,7 +84,7 @@ function ooui (rootElementPath) {
             if (!resizeTimeout) {
                 resizeTimeout = setTimeout(function() {
                     resizeTimeout = null;
-                    actualResizeHandler();            
+                    resizeHandler();            
                 }, 100);
             }
         }
@@ -145,6 +145,17 @@ function msgSet (m) {
     if (debug) console.log ("Set", node, parts, value);
 }
 
+function msgSetAttr (m) {
+    const id = m.id;
+    const node = getNode (id);
+    if (!node) {
+        console.error ("Unknown node id", m);
+        return;
+    }
+    node.setAttribute(m.k, m.v);
+    if (debug) console.log ("SetAttr", node, m.k, m.v);
+}
+
 function msgCall (m) {
     const id = m.id;
     const node = getNode (id);
@@ -203,6 +214,9 @@ function processMessage (m) {
         case "set":
             msgSet (m);
             break;
+        case "setAttr":
+            msgSetAttr (m);
+            break;
         case "call":
             msgCall (m);
             break;
diff --git a/Ooui/Element.cs b/Ooui/Element.cs
index 8ba85e9..a7287d1 100644
--- a/Ooui/Element.cs
+++ b/Ooui/Element.cs
@@ -102,6 +102,16 @@ namespace Ooui
             Style.PropertyChanged += HandleStylePropertyChanged;
         }
 
+        public void SetAttribute (string attributeName, string value)
+        {
+            Send (new Message {
+                MessageType = MessageType.SetAttribute,
+                TargetId = Id,
+                Key = attributeName,
+                Value = value,
+            });
+        }
+
         void HandleStylePropertyChanged (object sender, PropertyChangedEventArgs e)
         {
             SendSet ("style." + Style.GetJsName (e.PropertyName), Style[e.PropertyName]);
diff --git a/Ooui/EventTarget.cs b/Ooui/EventTarget.cs
index 2f66139..a7be894 100644
--- a/Ooui/EventTarget.cs
+++ b/Ooui/EventTarget.cs
@@ -163,6 +163,12 @@ namespace Ooui
                         state.Add (message);
                     });
                     break;
+                case MessageType.SetAttribute:
+                    UpdateStateMessages (state => {
+                        state.RemoveAll (x => x.MessageType == MessageType.SetAttribute && x.Key == message.Key);
+                        state.Add (message);
+                    });
+                    break;
                 case MessageType.Listen:
                     AddStateMessage (message);
                     break;
diff --git a/Ooui/Message.cs b/Ooui/Message.cs
index ae9ffb1..0498437 100644
--- a/Ooui/Message.cs
+++ b/Ooui/Message.cs
@@ -46,6 +46,8 @@ namespace Ooui
         Create,
         [EnumMember(Value = "set")]
         Set,
+        [EnumMember (Value = "setAttr")]
+        SetAttribute,
         [EnumMember(Value = "call")]
         Call,
         [EnumMember(Value = "listen")]