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Sorry, this isn't correct. Red is a perfectly valid color value. This is not about property expansion.

This is because the source uses curly quotes, which are not recognized as a parameter bracketing, and so the curly quotes are trying to be interpreted as part of the value.

Change the quotes to actual quotes and it starts working as expected.

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No, the OP is correct. You're right that <red> is a valid CSS color keyword, but <”red”> is not. Because of this, the CSS spec treats it as a "legacy color value" and attempts to interpret it as a string of characters (including the quotes) rather than a keyword.

yeap

The quotes in my explanation are the 'curly' quotes. They just display differently on HN.

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