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http://quirks.spec.whatwg.org/#quirky-color-0 [[ corresponds to a number token, a dimension token or an ident token in the syntax ]] Say component value instead. Basically editorial change since "preserved" tokens (including number/dimension/ident) are component values. Ack SimonSapin
https://github.com/whatwg/quirks/commit/716c1c5d6bf3f2a5792235c7ccf135022e07fa04