code: function () {
                  // Adjust for alignment and rotation. Rotation of useHTML content is not yet implemented
                  // but it can probably be implemented for Firefox 3.5+ on user request. FF3.5+
                  // has support for CSS3 transform. The getBBox method also needs to be updated
                  // to compensate for the rotation, like it currently does for SVG.
                  // Test case: http://jsfiddle.net/highcharts/Ybt44/
  
                  var rotation = this.rotation,
                    costheta = mathCos(rotation * deg2rad),
                    sintheta = mathSin(rotation * deg2rad);
  
                  css(this.element, {
                      filter: rotation ? ['progid:DXImageTransform.Microsoft.Matrix(M11=', costheta,
                          ', M12=', -sintheta, ', M21=', sintheta, ', M22=', costheta,
                          ', sizingMethod=\'auto expand\')'].join('') : NONE
                  });
              }
docs: Set the rotation of a span with oldIE's filter