From 8dc9be8a348826380e01536b1a2f536a5e4947d9 Mon Sep 17 00:00:00 2001
From: Daniel Freedman <dfreedm@google.com>
Date: Mon, 21 Oct 2013 15:48:25 -0700
Subject: [PATCH] A few spec compliance changes to pass the w3c tests

- relatedTarget must be null if pointerevent is capturing
- `new PointerEvent(..) instanceof PointerEvent === true`
- Manual tests: http://github.com/w3c/web-platform-tests
---
 src/PointerEvent.js | 6 ++++++
 src/dispatcher.js   | 4 ++++
 2 files changed, 10 insertions(+)

diff --git a/src/PointerEvent.js b/src/PointerEvent.js
index 79d9eeb8..ed296aba 100644
--- a/src/PointerEvent.js
+++ b/src/PointerEvent.js
@@ -117,6 +117,9 @@
       );
     }
 
+    // make the event pass instanceof checks
+    e.__proto__ = PointerEvent.prototype;
+
     // define the buttons property according to DOM Level 3 spec
     if (!HAS_BUTTONS) {
       // IE 10 has buttons on MouseEvent.prototype as a getter w/o any setting
@@ -148,6 +151,9 @@
     return e;
   }
 
+  // PointerEvent extends MouseEvent
+  PointerEvent.prototype = Object.create(MouseEvent.prototype);
+
   // attach to window
   if (!scope.PointerEvent) {
     scope.PointerEvent = PointerEvent;
diff --git a/src/dispatcher.js b/src/dispatcher.js
index f2c7d8ee..058fcdc4 100644
--- a/src/dispatcher.js
+++ b/src/dispatcher.js
@@ -215,6 +215,10 @@
      * @return {Event} A PointerEvent of type `inType`
      */
     makeEvent: function(inType, inEvent) {
+      // relatedTarget must be null if pointer is captured
+      if (this.captureInfo) {
+        inEvent.relatedTarget = null;
+      }
       var e = new PointerEvent(inType, inEvent);
       this.targets.set(e, this.targets.get(inEvent) || inEvent.target);
       return e;