The big sticking point is not the JS access, that’s mildly easy to implement.
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.
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.