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Re: [CSS21] is 'all' the 'initial' value of @media ?

From: Benjamin Hawkes-Lewis <bhawkeslewis@googlemail.com>
Date: Tue, 08 May 2007 23:31:45 +0100
Message-ID: <4640FA51.4090008@googlemail.com>
To: Al Gilman <Alfred.S.Gilman@IEEE.org>
CC: www-style@w3.org, wai-liaison@w3.org

I'm not sure how tangential this is to what you're asking, but note that 
in HTML 4.01 the default value of the media attribute is "screen":


So in practice most applied stylesheets would inherit that value in the 
absence of @media.

Benjamin Hawkes-Lewis

Al Gilman wrote:
> I've been reviewing CSS techniques for assistive conditional content, such
> as the technique in the WCAG drafts:
> http://www.w3.org/WAI/GL/WCAG20/WD-WCAG20-TECHS/#C7
> I went to CSS 2.1 to confirm my understanding that
> <rule
> class="toConfirmOrDeny">
> If no @media rule is present in the context of a style rule, the
> effect of that style rule is the same as if there were an @media: all
> rule in the context.  The subject style rule applies to
> any media type.  (Properties assigned in this rule will apply or
> not apply per the applicability stated in their defining paragraphs.)
> </rule>
> Somehow, the section on the @media rule fails to say this.
> http://www.w3.org/TR/CSS21/media.html#at-media-rule
> It is, however, stated with regard to the @import rule.
> http://www.w3.org/TR/CSS21/cascade.html#at-import
> 1. Is my interpretation above the same as your reading of this 
> specification?
> 2. Is this a bug in the specification that this is not stated in the 
> @media section,
> or does it follow from general language on selectors or the cascade 
> somewhere
> else?
> Al
Received on Tuesday, 8 May 2007 22:31:58 UTC

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