Drive-by comment: seems that in Firefox 78+, and the upcoming Safari 14 (currently in the Technology Preview stage), the `:is()` and `:where()` pseudo-classes become invalid when an invalid selector is included in the list. For example, `document.querySelectorAll('div:is(div, :bogus)')` throws in both. -- GitHub Notification of comment by danburzo Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/3264#issuecomment-675127431 using your GitHub account -- Sent via github-notify-ml as configured in https://github.com/w3c/github-notify-ml-configReceived on Monday, 17 August 2020 21:34:58 UTC
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