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Re: [csswg-drafts] [css-values] String concatentation (#542)

From: Noam Rosenthal via GitHub <sysbot+gh@w3.org>
Date: Fri, 30 Oct 2020 13:43:20 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-719559989-1604065399-sysbot+gh@w3.org>
Suggesting an alternative approach here.
Maybe general-purpose string concatenation is too low-level for CSS.

Instead, I'm suggesting to treat every string-requiring CSS property differently.

- For paths, allow constructing paths without strings (see here: https://github.com/w3c/csswg-drafts/issues/5674#issuecomment-719067583)
- For urls, allow the `url` function to take more than one argument and have that function concat them.
- For some of the other props requiring strings, like `content`, allow string concatenation in the same way that it's done today, by having several arguments (e.g. `content: "(" attr(title) ")"`, or `font-family: "Times-New-Roman", var(--fallback)`)

The reason for this is a sense that strings inside CSS may create a "language within a language" for each property, (which is already my sense with e.g. `path` strings).

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