docs: function () {
                  if (this._dpi) {
                      return this._dpi;
                  }
  
                  var document = Aria.$window.document;
                  var domElement = document.createElement("div");
                  domElement.style.cssText = "height: 1in; left: -100%; position: absolute; top: -100%; width: 1in;";
                  document.body.appendChild(domElement);
                  var dpi = this._dpi = {
                      x : domElement.offsetWidth,
                      y : domElement.offsetHeight
                  };
                  document.body.removeChild(domElement);
                  return dpi;
              }