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[Bug 13514] New: Support different resolutions for command elements and images

From: <bugzilla@jessica.w3.org>
Date: Tue, 02 Aug 2011 03:21:04 +0000
To: public-html-bugzilla@w3.org
Message-ID: <bug-13514-2486@http.www.w3.org/Bugs/Public/>

           Summary: Support different resolutions for command elements and
           Product: HTML WG
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: a11y, a11ytf
          Severity: normal
          Priority: P2
         Component: HTML5 spec (editor: Ian Hickson)
        AssignedTo: ian@hixie.ch
        ReportedBy: gcl-0039@access-research.org
         QAContact: public-html-bugzilla@w3.org
                CC: mike@w3.org, public-html-wg-issue-tracking@w3.org,
                    public-html@w3.org, public-html-a11y@w3.org

HTML5 should allow the author to link a command elements to multiple images
optimized for different screen resolutions and zoom ratios. This is currently
supported for page icons but not for icons associated with the command element.
It should also allow static images (e.g. the img element) to also reference
multiple images optimized for different resolutions, so that pages can better
adapt to different screen resolutions and zoom ratios without having to resort
to complex scripting.

Use case: Todd is working on a high resolution monitor but has moderately low
vision, so he uses his browser's zoom setting so that he can read the text
easily and discern the details of images. He goes to a web page that includes
multiple buttons implemented using command elements, each represented by an
icon. Unfortunately, since HTML5 only allows a command element to link to a
single image, the browser has to use brute force methods to enlarge the image,
with a result that's blocky and difficult to understand. If the author had been
able to link to multiple versions of the image, each optimized for different
screen resolutions or sizes, Todd could have been presented with graphical
buttons he could understand.

Some competing solutions to this problem have been proposed, including CSS
Image Values, multi-resolution images, and of course script solutions, but it
is not yet clear which if any of these will survive.

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Received on Tuesday, 2 August 2011 03:21:05 UTC

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