Re: [csswg-drafts] [selectors] Let :is() have better error-recovery behavior than normal Selectors (#3264)

> As a minor variation, preserving the same benefits, we could say that error recovery only applies if at least one of the selectors is valid.
>
>Then `:not(:nonsense, :gibberish)` is invalid.

That should probably only apply to `:not(…)`, as `:commonly-supported, :is(:rarely-supported)` can be used to avoid invalidating the entire selector list if the `:rarely-supported` pseudo‑class isn’t supported by the current browser but `:is(…)` and `:commonly-supported` are supported by the current browser.

Also, it might be a good idea to still parse `:not(:nonsense, :gibberish)` as valid, but matching nothing.

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