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[css3-conditional] @supports compounds with general_enclosed

From: Bear Travis <betravis@adobe.com>
Date: Mon, 28 Jul 2014 23:58:10 +0000
To: "www-style@w3.org" <www-style@w3.org>
Message-ID: <CFFC31A0.2E4A9%betravis@adobe.com>

I was reading the section on @supports and the general_enclosed production. [1] The general_enclosed production is “always false. Additionally, style sheets must not write ‘@supports’ rules that match this grammar production.” What does the “must not write” portion entail? Can the general_enclosed production still be part of an overall true production, if combined using a disjunction and a true condition, or negated? I ask because some implementations maintain the general_production in CSSConditionalRule’s conditionText and cssText [2] for a production like "@supports((margin: 0) or (green))”, and I wasn’t sure if this counted as writing or not.

Thanks for your help,
-Bear Travis

[1] http://www.w3.org/TR/css3-conditional/#at-supports

[2] http://www.w3.org/TR/css3-conditional/#cssconditionrule

Received on Monday, 28 July 2014 23:58:40 UTC

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