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[Proposal] Checkpoint 10.4 highlight requirement and image maps

From: Ian B. Jacobs <ij@w3.org>
Date: Tue, 03 Jul 2001 16:04:42 -0400
Message-ID: <3B42255A.923120AC@w3.org>
To: w3c-wai-ua@w3.org
CC: dean@w3.org
Hello,

In the 22 June 2001 UAAG 1.0 [1], provision 4 of checkpoint 10.4
("Highlight
special elements") reads:

   "For an image map, the user agent must highlight the image map as 
    a whole and should allow configuration to highlight each enabled 
    region."

I discussed this provision and the following question with Dean Jackson
of the SVG Working Group: Should we consider an SVG with links in it an
image map?

We both felt that an SVG image with links in it was a kind of image map,
but that it was different from image maps as used in HTML, and we did
not
think that provision 4 should apply to SVG-like content. My summary of
the
difference is this:

 - In SVG, an image is composed of objects, each of which is rendered
   independently, in document order.

 - The case we meant to address in 10.4 was for images that are not
composed
   of objects rendered individually (e.g., a GIF image with active
regions
   specified with AREA elements).

I propose that the above provision be edited to reflect a difference
between
composed and monolithic images and video.

<NEW>
For images or animations that have enabled graphical regions (e.g., HTML
image maps or SVG images that include links), the user agent must
highlight each region that corresponds to an independently rendered
element.

 Note: For instance, in HTML, a user agent rendering a PNG image
 as part of an image map must highlight the image as a whole (and
 may highlight each individual region specified in the MAP element). 
 For an SVG image that includes 15 links, each rendered independently 
 according to the SVG specification, the user agent must  highlight all 
 15 links.
</NEW>

We should also include some HTML and SVG examples in the Techniques
document.
Your contributed examples are welcome.

I am not thrilled with this language, but I support the distinction.
Improvements to the language welcome.

 _ Ian


[1] http://www.w3.org/TR/2001/WD-UAAG10-20010622/

-- 
Ian Jacobs (ij@w3.org)   http://www.w3.org/People/Jacobs
Cell:                    +1 917 450-8783
Received on Tuesday, 3 July 2001 16:07:18 GMT

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