Just verifying as I write the spec - in <https://github.com/w3c/csswg-drafts/issues/3264#issuecomment-441148706> @ewilligers suggested that we handle "single selector, which is invalid" differently from the rest of the cases, since that has legacy implications, but it looks like we're no longer doing that? That is, `:is(:unknown)` is valid but matches nothing, just like `:is()` and `:is(:unknown1, :unknown2)`? -- GitHub Notification of comment by tabatkins Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/3264#issuecomment-692181474 using your GitHub account -- Sent via github-notify-ml as configured in https://github.com/w3c/github-notify-ml-configReceived on Monday, 14 September 2020 16:51:51 UTC
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