Support required support from libxml/libxsl. That tops out at 1.0. I guess you could implement your own, as it’s an open standard, but I don’t think anyone ever bothered to.
replyI think the guy behind Saxon may be one of the XSLT authors.
The author of Saxon is on the W3C committee for XPath, XSLT, and XQuery.
replyThat said, Saxon does (or at least did) have an open source version. It doesn't have all the features, e.g. no schema validation or query optimization, but all within the boundaries of the spec. The bigger problem there is that Saxon is written in Java, and browsers understandably don't want to take a dependency on that just for XSLT 2+.