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Not really, because that would add a dependency on Javascript whereas, at the moment, XSLT works without Javascript enabled.

Not necessarily. The idea is that this is browser-internal, so presumably it would still work even if JS from external sources is disabled.

No. The idea is that website authors do the work. The proposal suggests the browsers wholesale remove support and forget about it.

Oh, I understand that that's the WHATWG proposal. I'm talking about webstrand's idea.