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[Bug 13453] New: Scaling of images and image maps

From: <bugzilla@jessica.w3.org>
Date: Fri, 29 Jul 2011 14:24:20 +0000
To: public-html@w3.org
Message-ID: <bug-13453-2495@http.www.w3.org/Bugs/Public/>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=13453

           Summary: Scaling of images and image maps
           Product: HTML WG
           Version: unspecified
          Platform: PC
               URL: http://www.w3.org/TR/2011/WD-html5-20110525/the-map-el
                    ement.html#image-maps
        OS/Version: Windows XP
            Status: NEW
          Keywords: a11y, a11ytf
          Severity: normal
          Priority: P2
         Component: HTML5 spec (editor: Ian Hickson)
        AssignedTo: ian@hixie.ch
        ReportedBy: cooper@w3.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


The spec states "For historical reasons, the coordinates must be interpreted
relative to the displayed image, even if it stretched using CSS or the image
element's width and height attributes." 

This wording is ambiguous about various scaling mechanisms and how they do or
do not affect scaling of image map regions. Images may be scaled by HTML
attributes, author CSS, user CSS, browser zoom, and perhaps other mechanisms.
The HTML accessibility task force could not achieve a common interpretation of
which scaling mechanisms would be applied before overlaying the image map with
the areas relative to the resized image, vs which scaling mechanisms would be
applied in such a way that imagemap areas would scale along with the image. If
this is interpreted inconsistently, it will lead to major accessibility and
usability problems on sites.

Therefore this statement needs clarification and expansion to address all use
cases clearly. We will attempt to provide suggested wording as a follow-on
comment to this bug.

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Received on Friday, 29 July 2011 14:24:25 UTC

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