diff --git a/Ooui/Element.cs b/Ooui/Element.cs
index 0813387..253f57d 100644
--- a/Ooui/Element.cs
+++ b/Ooui/Element.cs
@@ -25,67 +25,67 @@ namespace Ooui
             set => SetProperty (ref hidden, value, "hidden");
         }
 
-        public event EventHandler Clicked {
+        public event TargetEventHandler Clicked {
             add => AddEventListener ("click", value);
             remove => RemoveEventListener ("click", value);
         }
 
-        public event EventHandler DoubleClicked {
+        public event TargetEventHandler DoubleClicked {
             add => AddEventListener ("dblclick", value);
             remove => RemoveEventListener ("dblclick", value);
         }
 
-        public event EventHandler KeyDown {
+        public event TargetEventHandler KeyDown {
             add => AddEventListener ("keydown", value);
             remove => RemoveEventListener ("keydown", value);
         }
 
-        public event EventHandler KeyPressed {
+        public event TargetEventHandler KeyPressed {
             add => AddEventListener ("keypress", value);
             remove => RemoveEventListener ("keypress", value);
         }
 
-        public event EventHandler KeyUp {
+        public event TargetEventHandler KeyUp {
             add => AddEventListener ("keyup", value);
             remove => RemoveEventListener ("keyup", value);
         }
 
-        public event EventHandler MouseDown {
+        public event TargetEventHandler MouseDown {
             add => AddEventListener ("mousedown", value);
             remove => RemoveEventListener ("mousedown", value);
         }
 
-        public event EventHandler MouseEntered {
+        public event TargetEventHandler MouseEntered {
             add => AddEventListener ("mouseenter", value);
             remove => RemoveEventListener ("mouseenter", value);
         }
 
-        public event EventHandler MouseLeft {
+        public event TargetEventHandler MouseLeft {
             add => AddEventListener ("mouseleave", value);
             remove => RemoveEventListener ("mouseleave", value);
         }
 
-        public event EventHandler MouseMoved {
+        public event TargetEventHandler MouseMoved {
             add => AddEventListener ("mousemove", value);
             remove => RemoveEventListener ("mousemove", value);
         }
 
-        public event EventHandler MouseOut {
+        public event TargetEventHandler MouseOut {
             add => AddEventListener ("mouseout", value);
             remove => RemoveEventListener ("mouseout", value);
         }
 
-        public event EventHandler MouseOver {
+        public event TargetEventHandler MouseOver {
             add => AddEventListener ("mouseover", value);
             remove => RemoveEventListener ("mouseover", value);
         }
 
-        public event EventHandler MouseUp {
+        public event TargetEventHandler MouseUp {
             add => AddEventListener ("mouseup", value);
             remove => RemoveEventListener ("mouseup", value);
         }
 
-        public event EventHandler Wheeled {
+        public event TargetEventHandler Wheeled {
             add => AddEventListener ("wheel", value);
             remove => RemoveEventListener ("wheel", value);
         }
diff --git a/Ooui/EventTarget.cs b/Ooui/EventTarget.cs
index 27db0e4..2f66139 100644
--- a/Ooui/EventTarget.cs
+++ b/Ooui/EventTarget.cs
@@ -9,8 +9,8 @@ namespace Ooui
     {
         readonly List<Message> stateMessages = new List<Message> ();
 
-        readonly Dictionary<string, List<EventHandler>> eventListeners =
-            new Dictionary<string, List<EventHandler>> ();
+        readonly Dictionary<string, List<TargetEventHandler>> eventListeners =
+            new Dictionary<string, List<TargetEventHandler>> ();
 
         public string Id { get; private set; } = GenerateId ();
 
@@ -45,17 +45,17 @@ namespace Ooui
             return null;
         }
 
-        public void AddEventListener (string eventType, EventHandler handler)
+        public void AddEventListener (string eventType, TargetEventHandler handler)
         {
             if (eventType == null) return;
             if (handler == null) return;
 
             var sendListen = false;
 
-            List<EventHandler> handlers;
+            List<TargetEventHandler> handlers;
             lock (eventListeners) {
                 if (!eventListeners.TryGetValue (eventType, out handlers)) {
-                    handlers = new List<EventHandler> ();
+                    handlers = new List<TargetEventHandler> ();
                     eventListeners[eventType] = handlers;
                     sendListen = true;
                 }
@@ -70,12 +70,12 @@ namespace Ooui
                 });
         }
 
-        public void RemoveEventListener (string eventType, EventHandler handler)
+        public void RemoveEventListener (string eventType, TargetEventHandler handler)
         {
             if (eventType == null) return;
             if (handler == null) return;
 
-            List<EventHandler> handlers;
+            List<TargetEventHandler> handlers;
             lock (eventListeners) {
                 if (eventListeners.TryGetValue (eventType, out handlers)) {
                     handlers.Remove (handler);
@@ -176,15 +176,19 @@ namespace Ooui
             if (message.TargetId != Id)
                 return false;
 
-            List<EventHandler> handlers = null;
+            List<TargetEventHandler> handlers = null;
             lock (eventListeners) {
-                List<EventHandler> hs;
+                List<TargetEventHandler> hs;
                 if (eventListeners.TryGetValue (message.Key, out hs)) {
-                    handlers = new List<EventHandler> (hs);
+                    handlers = new List<TargetEventHandler> (hs);
                 }
             }
             if (handlers != null) {
-                var args = EventArgs.Empty;
+                var args = new TargetEventArgs ();
+                if (message.Value is Newtonsoft.Json.Linq.JObject o) {
+                    args.OffsetX = (double)o["offsetX"];
+                    args.OffsetY = (double)o["offsetY"];
+                }
                 foreach (var h in handlers) {
                     h.Invoke (this, args);
                 }
@@ -212,4 +216,12 @@ namespace Ooui
             return typeof (EventTarget).IsAssignableFrom (objectType);
         }
     }
+
+    public delegate void TargetEventHandler (object sender, TargetEventArgs e);
+
+    public class TargetEventArgs : EventArgs
+    {
+        public double OffsetX { get; set; }
+        public double OffsetY { get; set; }
+    }
 }
diff --git a/Ooui/Form.cs b/Ooui/Form.cs
index dc1eee6..557a72b 100644
--- a/Ooui/Form.cs
+++ b/Ooui/Form.cs
@@ -10,12 +10,12 @@ namespace Ooui
             set => SetProperty (ref action, value ?? "", "action");
         }
 
-        public event EventHandler Submitted {
+        public event TargetEventHandler Submitted {
             add => AddEventListener ("submit", value);
             remove => RemoveEventListener ("submit", value);
         }
 
-        public event EventHandler Reset {
+        public event TargetEventHandler Reset {
             add => AddEventListener ("reset", value);
             remove => RemoveEventListener ("reset", value);
         }
diff --git a/Ooui/Input.cs b/Ooui/Input.cs
index 3c592cc..e24abe9 100644
--- a/Ooui/Input.cs
+++ b/Ooui/Input.cs
@@ -30,12 +30,12 @@ namespace Ooui
             }
         }
 
-        public event EventHandler Changed {
+        public event TargetEventHandler Changed {
             add => AddEventListener ("change", value);
             remove => RemoveEventListener ("change", value);
         }
 
-        public event EventHandler Inputted {
+        public event TargetEventHandler Inputted {
             add => AddEventListener ("input", value);
             remove => RemoveEventListener ("input", value);
         }
diff --git a/Ooui/Select.cs b/Ooui/Select.cs
index 1cc4318..7f53175 100644
--- a/Ooui/Select.cs
+++ b/Ooui/Select.cs
@@ -10,7 +10,7 @@ namespace Ooui
             set => SetProperty (ref val, value ?? "", "value");
         }
 
-        public event EventHandler Changed {
+        public event TargetEventHandler Changed {
             add => AddEventListener ("change", value);
             remove => RemoveEventListener ("change", value);
         }
diff --git a/Ooui/TextArea.cs b/Ooui/TextArea.cs
index b9a60f5..94ca6fe 100644
--- a/Ooui/TextArea.cs
+++ b/Ooui/TextArea.cs
@@ -4,12 +4,12 @@ namespace Ooui
 {
     public class TextArea : FormControl
     {
-        public event EventHandler Changed {
+        public event TargetEventHandler Changed {
             add => AddEventListener ("change", value);
             remove => RemoveEventListener ("change", value);
         }
 
-        public event EventHandler Inputted {
+        public event TargetEventHandler Inputted {
             add => AddEventListener ("input", value);
             remove => RemoveEventListener ("input", value);
         }