Yeah, XSLT in the browser is definitely one of those "It seemed like a good idea at the time" architectures, and you don't hear much about it any more, but I do think that browsers other than IE were made to implement it quite a few years ago.
Of course what I'm thinking of is the architecture where you send an XML document to the browser, and that XML document has a processing-instruction at the beginning linking to an XSLT document which is supposed to be used to transform the XML document to HTML for the browser to display. But from what I've seen in this
thread, I have no idea whether that's the concept being asked about.