Added documentation for originalTarget

src/mousetracker.js

@@ -737,6 +737,8 @@
          *      True if the original event is a touch event, otherwise false. <span style="color:red;">Deprecated. Use pointerType and/or originalEvent instead.</span>
          * @param {Object} event.originalEvent
          *      The original event object.
+         * @param {Element} event.originalTarget
+         *      The DOM element clicked on.
          * @param {Object} event.userData
          *      Arbitrary user-defined object.
          */

src/viewer.js

@@ -2866,6 +2866,7 @@ function onCanvasClick( event ) {
      * @property {Boolean} quick - True only if the clickDistThreshold and clickTimeThreshold are both passed. Useful for differentiating between clicks and drags.
      * @property {Boolean} shift - True if the shift key was pressed during this event.
      * @property {Object} originalEvent - The original DOM event.
+     * @property {Element} originalTarget - The DOM element clicked on.
      * @property {Boolean} preventDefaultAction - Set to true to prevent default click to zoom behaviour. Default: false.
      * @property {?Object} userData - Arbitrary subscriber-defined object.
      */