This won't work with mobile sites effectively. That was my goal with the .us site I mentioned, using XSLT to serve different templates based on platform. I have not been able to find any mobile web browser that will parse XSLT reliably. Even Opera does not acknowledge that this is a supported feature of their mobile browser. Internet Explorer and Opera also have a different implementation of XSLT than Firefox, which can cause issues if you want to use multiple style sheets.

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