It really should just be compiled to WASM and used with some sort of DOM bridge.
It’s that currently you can open an XML file (including feeds) with an associated stylesheet and the stylesheet gets applied, which can be used to render an HTML document on the client side from an xml source like a feed.
You can’t have the browser load an XML file and have it transformed automatically as happens now
I foresee a LOT of this "Panic Replace XSL" work landing right in my lap and if someone's already done the work I want to know about it.