docs: function (domEvent, popup) {
                  var documentScroll = ariaUtilsDom._getDocumentScroll();
                  var clickPosition = {
                      'top' : domEvent.clientY + documentScroll.scrollTop,
                      'left' : domEvent.clientX + documentScroll.scrollLeft
                  };
  
                  var popupPosition = {
                      'top' : popup.computedStyle.top,
                      'left' : popup.computedStyle.left
                  };
  
                  var popupSize = {
                      'width' : popup.computedStyle.width,
                      'height' : popup.computedStyle.height
                  };
                  return (clickPosition.top >= popupPosition.top && clickPosition.left >= popupPosition.left
                          && clickPosition.top <= popupPosition.top + popupSize.height && clickPosition.left <= popupPosition.left
                          + popupSize.width);
              }