With Retina devices - padding within the canvas elements are incorrect. Padding unit used within the Canvas element is pixels, and when using the device-pixel-ratio=2 doubles the padding as well, but this creates too much padding on the Retina devices. Text height alignment is off as well, so vertically centering Cufon text on a header consistently would be impossible for both Retina and Non-Retina devices. Characters such as "g", "j" etc are also being clipped off the edge of the canvas element.
Fix here: Devolv@ff28728