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I can't remember off-hand, but scoped styles shouldn't have made it into 5.0's Recommendation (one of the requirements for CR to PR advancement is showing each

I can't remember off-hand, but scoped styles shouldn't have made it into 5.0's Recommendation (one of the requirements for CR to PR advancement is showing each feature has implementation experience), though if it did it wouldn't be the only one that made it through into HTML 5.0 despite the W3C process. As for the WHATWG, I don't believe that any feature without implementer support has landed in the WHATWG HTML spec in several years now, and I think there's a clear intention to keep it that way, so there shouldn't be featured that never get implemented in the spec.

tannhaeuser 10y ago
This was just an example, please don't take it as criticism. The point, though, stands, and is illustrated by the fact that I can't even use a permalink to a version of the WHATWG HTML spec that still has scoped styles defined (at best, you can point to a ancient bikeshed or anolis commit). Which is why WHATWG HTML isn't a "standard".