Using Google Chrome 21.0.1155.2 dev (I know this is not a supported version, but as in https://meta.superuser.com/q/4711 it might be of interest anyway, and at least might serve as a heads up for when the version hits stable), I get this sample rendering for the <kbd> tag:

![Sample rendering][1]

As with the element position bug I linked above, I would guess this has to do with Chrome's built-in fonts that are wider than expected. In that case, this would manifest itself on any system using Chrome that lacks the primary defined font in the CSS for the `kbd` tag, and would be solved by increasing the kbd box width by a pixel or so.

  [1]: https://i.sstatic.net/sGzYK.png