https://drafts.csswg.org/css-syntax/#would-start-an-identifier says > Look at the first code point: > - U+002D HYPHEN-MINUS > If the second code point is [...] a U+002D HYPHEN-MINUS, [...] return true. So `--` starts an identifier. Then, in https://drafts.csswg.org/css-syntax/#consume-token > - U+002D HYPHEN-MINUS (-) > [...] if the input stream starts with an identifier, reconsume the current input code point, consume an ident-like token, and return it. So I would say yes. And a single underscore `_` is also an identifier (and this was the case even in [CSS2](https://www.w3.org/TR/CSS21/syndata.html#value-def-identifier)). The non-normative description seems wrong. -- GitHub Notification of comment by Loirooriol Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/5764#issuecomment-739561658 using your GitHub account -- Sent via github-notify-ml as configured in https://github.com/w3c/github-notify-ml-configReceived on Sunday, 6 December 2020 20:49:55 UTC
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