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Re: method for providing programmatically associated long description

From: Steven Faulkner <faulkner.steve@gmail.com>
Date: Wed, 25 Aug 2010 16:22:01 +0100
Message-ID: <AANLkTi=BqDUZqeH8AksLm2OPZ2LU1ROQXGuj0ZutE4ae@mail.gmail.com>
To: Leif Halvard Silli <xn--mlform-iua@xn--mlform-iua.no>
Cc: HTMLWG WG <public-html@w3.org>, HTML Accessibility Task Force <public-html-a11y@w3.org>
BTW
what I have suggested is not a standardized feature, just an example of how
to code a  programmatically associated long description.

I consider it a requirement for HTML5 that standardized language feature
(attribute or element) for providing a programmatically associated long
description is specified.

Whether it be an improved longdesc or something else, I don't mind, but I
don't consider longdesc as specced and implemented is  good enough.

regards
Stevef

On 25 August 2010 16:07, Steven Faulkner <faulkner.steve@gmail.com> wrote:

> Hi leif,
>
> The @coords in your example, in effect, makes the <img> a
>
> link, for all users. The intention? Also, it is tedious to have create
> those @coords.
>
> Noparticular intention it was a quickly mosked up example. Besides I do not
> believe it is a requirement for only to be available for some users is it? I
> certainly don't read that requirement in WCAG 2.0.
>
> But I am sure if an author wanted to achieve it they could. perhaps a 1px
> region would do it.
>
> As far as it being tedious creating the co-ordinates, most html code
> editors provide a GUI for creating image map regions, it took me a few
> moments to create the one in the example. And what percentage of images
> require a long description?
>
>
> > Why not simply wrap the <img> in an anchor element, then?
>
> the advantage this has is that it leaves the image alt attribute free for
> the text alternative for the image, while the area alt labels the link to
> the longdesc and the link to the longdesc is programmatically associated.
>
> regards
> Stevef
>   On 25 August 2010 13:52, Leif Halvard Silli <
> xn--mlform-iua@xn--mlform-iua.no> wrote:
>
>> Steven Faulkner, Wed, 25 Aug 2010 13:00:56 +0100:
>> > Hi all,
>> > another possible method for providjng a programmatically associated
>> > long description for an image:
>> >
>> > <img src="images/table.gif" alt="Bar Chart showing average rainfall
>> > in millimetres by country and season."  usemap="#longdesc">
>> > <map name="longdesc">
>> > <area alt="bar chart long description" coords="2,318,404,341"
>> > href="details.html#table">
>> > </map>
>>
>> The @coords in your example, in effect, makes the <img>/<object> a
>> link, for all users. The intention? Also, it is tedious to have create
>> those @coords.  Why not simply wrap the <img> in an anchor element,
>> then?
>>
>> That said, you probably don't need to use @coords: I just I did some
>> testing of VoiceOver, Jaws and NVDA (with IE, Webkit, Opera, Firefox),
>> to check whether or not they always consider an <area> element a link.
>> [1] (Short answer is that they don't see it as a link, whenever one
>> uses area{visibility:hidden}.) And if I remember correctly, then none
>> of them require the @coords attribute to be used, in order consider the
>> <area> element a link. Also, HTML5 does not require the @coords
>> attribute for <area> - if I can trust Validator.nu.
>>
>> So, in a summary, if authors can skip the @coords attribute, then this
>> method becomes simpler to use.
>>
>> [1]
>>
>> http://microformats.org/discuss/mail/microformats-new/2010-August/002166.html
>> --
>> leif halvard silli
>>
>
>
>
>  --
> with regards
>
> Steve Faulkner
> Technical Director - TPG Europe
> Director - Web Accessibility Tools Consortium
>
> www.paciellogroup.com | www.wat-c.org
> Web Accessibility Toolbar -
> http://www.paciellogroup.com/resources/wat-ie-about.html
>



-- 
with regards

Steve Faulkner
Technical Director - TPG Europe
Director - Web Accessibility Tools Consortium

www.paciellogroup.com | www.wat-c.org
Web Accessibility Toolbar -
http://www.paciellogroup.com/resources/wat-ie-about.html
Received on Wednesday, 25 August 2010 15:22:56 GMT

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