But XSLT is not strictly required for styling. In fact, Firefox also supports an out-of-band stylesheet inclusion via the `Link` HTTP header [1]:

    Link: </style.css>; rel=stylesheet

(Yes, this works even without <?xml-stylesheet?> PI others have mentioned.)

I think the best strategy for Google is to support this and simultaneously ditch XSLT. This way nothing is truly lost.

[1] You can test your browser from: https://annevankesteren.nl/test/html-element/style-header.ph...