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media queries WAI/PF comments

From: Al Gilman <asgilman@iamdigex.net>
Date: Mon, 25 Feb 2002 09:12:14 -0500 (EST)
Message-Id: <200202251412.JAA198495@smtp1.mail.iamworld.net>
To: www-style@w3.org
[On behalf of WAI.  Sorry I didn't get this off yesterday - Al]

With respect to version:

http://www.w3.org/TR/2002/WD-css3-mediaqueries-20020123

Comments are unnumbered and separated by '--' in the left margin.

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Recommend changing the name of of the 'width' property to 'viewport-width' to make it parallel with 'device-width' and the same for 'height' change to 'viewport-height.'

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In section "6.1 width" it says

   The "em" value is based on the font size of the root element.

Does this, or does this not require the retrieval and application of the linked stylesheet in order to determine the initial font size that this refers to?

For accessibility, this determination should acquire the base font size from the processor, that is to say incorporate the settings of the user inherited by the document from the operating system and browser.  How will that happen under the above definition?

I would think that the logical path for this value would be from the user settings into the browser's effective or default stylesheet and from there into the context of the root element of the document, which would inherit it from there.  This implies that if a stylesheet asserts an initial font size that this intervenes in the process and overrides the value from the browser.  Is this true?

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Screen readers interpret a document in multiple media from one rendering.  They do not apply a different stylesheet for the tactile or aural presentation from the one that produces the screen presentation.  Does this expression syntax for media applicability conditions allow one to indicate that the medium in use is at once both screen and Braille forms?  In both Braille and audio?  How?

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Please explain your reasoning which led to not supporting all features duly registerd and listed at 

Media Feature Tags

http://www.iana.org/assignments/media-feature-tags

both now and in the future by a suitable binding of that namespace to this syntax. 
Received on Monday, 25 February 2002 10:07:28 GMT

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