code: function leavingDocumentOut(e) {
          if (qq.safari()) {
              return e.x < 0 || e.y < 0;
          }
  
          return e.x === 0 && e.y === 0;
      }
docs: Attempt to determine when the file has left the document.  It is not always possible to detect this in all cases, but it is generally possible in all browsers, with a few exceptions.  Exceptions: * IE10+ & Safari: We can't detect a file leaving the document if the Explorer window housing the file overlays the browser window. * IE10+: If the file is dragged out of the window too quickly, IE does not set the expected values of the event's X & Y properties.