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Re: HTML5: Techniques for providing useful text alternatives

From: Steven Faulkner <faulkner.steve@gmail.com>
Date: Tue, 18 May 2010 10:13:13 +0100
Message-ID: <AANLkTimqok7h8oYwYRs0e9cp9yBp2udWfcKB37E8bozI@mail.gmail.com>
To: Emmanuelle Gutiérrez y Restrepo <coordina@sidar.org>
Cc: w3c-wai-ig@w3.org
Hi Emmanuelle,
I am glad you find it useful, eevn in its current state!

I have taken Johns comments and added them to the draft bug list.

> In Example 6.3, I think there's a syntax error in the example code, because
> the element "p" is inside the element "a" and should be reversed.

In HTML5 the <a> element can contain most other elements (except
interactive elements)
http://dev.w3.org/html5/spec/text-level-semantics.html#the-a-element

> The Example 11.1 is repeated and is not 11.2, which should be identical but
> for the linked image.

I have updated the second example, it was just a placeholder.

> I agree with Jonathan that it is important to add the user group formed by
> people with visual impairments but do not use screen readers. And also that
> you need to add text to images that convey information only by color.
>
> On the other hand, I think we need to include to include the "image map" in
> the document index and explanations about how they should be the alternative
> texts in that case.

I have added your comments as a bug to the draft:
http://www.w3.org/Bugs/Public/show_bug.cgi?id=9763


best regards
Stevef

On 17 May 2010 18:00, Emmanuelle Gutiérrez y Restrepo
<coordina@sidar.org> wrote:
> Hi Steven and all,
>
> Very good work, Steven. This will be very useful.
>
> I agree with Jonathan that it is important to add the user group formed by
> people with visual impairments but do not use screen readers. And also that
> you need to add text to images that convey information only by color.
>
> On the other hand, I think we need to include to include the "image map" in
> the document index and explanations about how they should be the alternative
> texts in that case.
>
> In Example 6.3, I think there's a syntax error in the example code, because
> the element "p" is inside the element "a" and should be reversed.
>
> The Example 11.1 is repeated and is not 11.2, which should be identical but
> for the linked image.
>
> Best regards,
> Emmanuelle
>
> ~~~~~~~~~~~~~~~~~~~~
> Emmanuelle Gutiérrez y Restrepo
> Directora de la Fundación Sidar
> Coordinadora del Seminario SIDAR
> www.sidar.org
> email: coordina@sidar.org / emmanuelle@sidar.org
>
>
>
>
> -----Mensaje original-----
> De: w3c-wai-ig-request@w3.org [mailto:w3c-wai-ig-request@w3.org] En nombre
> de Jonathan Avila
> Enviado el: lunes, 17 de mayo de 2010 14:27
> Para: w3c-wai-ig@w3.org
> Asunto: RE: HTML5: Techniques for providing useful text alternatives
>
> Steven, this document will be very useful to developers.  One user group
> that I feel should be added under "Examples of scenarios where users
> benefit from text alternatives for images" are users with visual
> impairments who do not use screen readers or assistive technology.  This
> includes users with color deficiencies and users with low vision.
>
> This is important because many users with low vision may be able to read
> the text and interpret most images but may need alternative text for
> certain images.  When alt text is only displayed with the alt attribute,
> users of some browsers and keyboard only users in this category will not
> have access to this text.
>
> In addition, related to example 4.1, using the alt attribute alone would
> IMHO not be sufficient for WCAG 2 compliance because the alternative for
> those who cannot distinguish colors is provided through the alt attribute.
> If a person with color deficiencies with normal acuity were viewing this
> image with a browser such as Firefox they would not have access to the
> alternative text.
>
> My recommendation in this latter example is to require that any meaning
> conveyed in the image via color is in additionally displayed without the
> use of color directly in the image (hatching, lines, etc.) or as text
> visible on-screen.  The alt attribute does not suffice in these
> situations.  I think this note would be a great addition to the document
> that you are authoring.
>
> Jonathan
>
>
> -----Original Message-----
> From: w3c-wai-ig-request@w3.org [mailto:w3c-wai-ig-request@w3.org] On
> Behalf Of Steven Faulkner
> Sent: Monday, May 17, 2010 6:51 AM
> To: W3C WAI-XTECH; WAI Interest Group
> Cc: HTMLWG WG; WebAIM Discussion List; wsg@webstandardsgroup.org
> Subject: HTML5: Techniques for providing useful text alternatives
>
> HTML5: Techniques for providing useful text alternatives
> http://dev.w3.org/html5/alt-techniques/
>
> This document is a work in progress currently edited by me, I
> encourage anyone with an interest to contribute to its development.
>
> Document aims:
> * Provide clear and practical advice on how to  provide appropriate
> text alternatives for images using currently supported  techniques
> * How to make use of the new features available in HTML5 and WAI-ARIA
> for providing text alternatives.
> * Understanding the advantages and disadvantages of each technique in
> reference to browser and assistive technology support.
> * Provide normative rules for each technique in regards to whether its
> correct use results in a conforming HTML5 document.
> * Harmonization of HTML5 document conformance in regards to image text
> alternatives with WCAG 2.0.
>
> The document has been put forward as a First Public Working Draft in
> the W3C HTML WG, it is expected this initial publication will occur
> next month.
>
> How you can help:
>
> If you are not a member of the W3C HTML WG:
> Email the HTML WG public comments list: public-html-comments@w3.org
> Email me: faulkner.steve@gmail.com
>
> Or preferably
>
> File a bug
>
> If you are a member of the HTML WG email the list or me  or preferably
> file a bug
> http://www.w3.org/Bugs/Public/enter_bug.cgi?product=HTML%20WG&component=al
> t%20techniques%20(editor:%20Steven%20Faulkner)
>
> --
> 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 Tuesday, 18 May 2010 09:14:10 GMT

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