Re: [csswg-drafts] [css-pseudo-4] Should Element.pseudo("unknown") be an error or return null? (#3603)

From: Anne van Kesteren via GitHub <sysbot+gh@w3.org> Date: Tue, 26 Feb 2019 09:26:27 +0000 To: public-css-archive@w3.org Message-ID: <issue_comment.created-467363388-1551173186-sysbot+gh@w3.org> · This archive was generated by hypermail 2.4.0 : Tuesday, 5 July 2022 06:41:44 UTC

I'd expect an exception if it doesn't meet the syntactic requirements for a pseudo-element. However, I guess that only really works if pseudo-elements won't gain arguments. Because at that point it's ambiguous whether `before(...)` meets the constraints or not.

It's somewhat confusing though that this issue uses "unknown" and the TAG review issue uses ":unknown". Does "before" work? Does ":before"? Does "::before"? Is there a formal definition of this method somewhere?

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