* Updated: event.preventDefault() has been added to all Mouse event handlers.

* Updated: Sprite.deltaX/Y removed due to non-use. prevX/Y values moved to Sprite._cache.prevX/Y.
* Updated: Due to missing extends parameter the Sprite prototype was picking up functions from classes it never meant to (Button, TilemapLayer), now fully isolated.

src/input/Mouse.js

@@ -117,6 +117,8 @@ Phaser.Mouse.prototype = {
     */
     onMouseDown: function (event) {
 
+        event.preventDefault();
+
         if (this.mouseDownCallback)
         {
             this.mouseDownCallback.call(this.callbackContext, event);
@@ -140,6 +142,8 @@ Phaser.Mouse.prototype = {
     */
     onMouseMove: function (event) {
 
+        event.preventDefault();
+
         if (this.mouseMoveCallback)
         {
             this.mouseMoveCallback.call(this.callbackContext, event);
@@ -163,6 +167,8 @@ Phaser.Mouse.prototype = {
     */
     onMouseUp: function (event) {
 
+        event.preventDefault();
+
         if (this.mouseUpCallback)
         {
             this.mouseUpCallback.call(this.callbackContext, event);