Re: 答复: Using ARIA in HTML

HI Eric.

To understand WAI-ARIA it is best to read the source documents:
The main table in 'Using ARIA in HTML' is an interpretation, extension and
clarification of the information in the WAI-ARIA section of HTML5 [1].
The WAI-ARIA section of HTML5  defines rules for use of ARIA in HTML and
how ARIA roles,states and properties map to HTML features.

The WAI-ARIA specification [2] defines ARIA roles,states and properties.
The WAI-ARIA implementation guide [3] defines how ARIA is to be implemented
in browsers. Advice for users (developers/authors) of WAI-ARIA is provided
in WAI-ARIA 1.0 Authoring Practices [4]

you wrote:

"But for the role, I feel a little confused, in your “using ARIA in HTML”,
> if we define role in an element, the element will be change to another kind
> of element. For example, <a href=…. Role=”button”>link</a>, so the a
> element will be change to <button>link</button>."
>

Using ARIA only describes how it owrks, it does not define anything, that
is defined in the docs I cited. If it is the case that a developer is using
a link, but it looks (via CSS) and acts (via scripting) like a button, then
the first advice would be to use a HTML button, if this is not practical,
then provide the correct role information to assistive technology using
ARIA role.

you wrote:

"And I also see that role can also be a class like attribute, like
> “presentation”, what’s the meaning?"
>

role=presentation is defined in WAI-ARIA 1.0, its effect is defined in the
WAI-ARIA user agent inplementation guide, information for developers is
provided in the WAI-ARIA authoring practices document [5] Further notes for
developers are provided in Using ARIA in HTML [6]

regards
SteveF

[1] http://dev.w3.org/html5/spec/wai-aria.html#wai-aria
[2] http://www.w3.org/WAI/PF/aria/
[3] http://www.w3.org/WAI/PF/aria-implementation/
[4] http://www.w3.org/WAI/PF/aria-practices/
[5] http://www.w3.org/WAI/PF/aria-practices/#presentation_role
[6] http://dvcs.w3.org/hg/aria-unofficial/raw-file/tip/index.html#notes

On 5 July 2012 09:28, Sunyang (Eric) <eric.sun@huawei.com> wrote:

>  Hi Steve:****
>
> ** **
>
> Thanks for your document.****
>
> I am new to a11y, so I spend some time to review and try to understand
> ARIA in HTML.****
>
> ** **
>
> Alt is easy for understanding, is just some text will be reading to assist
> people know what is the image/video/…  ****
>
> But for the role, I feel a little confused, in your “using ARIA in HTML”,
> if we define role in an element, the element will be change to another kind
> of element.****
>
> For example, <a href=…. Role=”button”>link</a>, so the a element will be
> change to <button>link</button>.****
>
> I cannot understand what’s benefit to change the element to another using
> role, why?****
>
> ** **
>
> And I also see that role can also be a class like attribute, like
> “presentation”, what’s the meaning?****
>
> ** **
>
> Sorry for so many questions ;)****
>
> ** **
>
> ** **
>
> ** **
>  ------------------------------
>
> Yang Sun
> Email: eric.sun@huawei.com
> Huawei Technologies Co., Ltd.
> http://www.huawei.com ****
>  ------------------------------
>
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> ** **
>
> *发件人:* Steve Faulkner [mailto:faulkner.steve@gmail.com]
> *发送时间:* 2012年6月29日 20:23
> *收件人:* HTMLWG WG
> *抄送:* HTML Accessibility Task Force
> *主题:* Using ARIA in HTML****
>
> ** **
>
> I have posted an intial draft of a document I have been working on which
> attempts to provide practical advice to developers on what ARIA to use in
> HTML.
>
>  <goog_994905413>
> http://dvcs.w3.org/hg/aria-unofficial/raw-file/tip/index.html
>
>
> My intention is to provide a non normative resource that fills in the gaps
> in the current HTML5 specification and a document that is more readable
> (i.e. less jargonist) It does deviate from HTML5 in some of its
> suggestions, these deviations are based on current implementation realities.
>
> all feedback welcome
>
> --
> with regards
>
> Steve Faulkner
> Technical Director - TPG
>
> www.paciellogroup.com | www.HTML5accessibility.com |
> www.twitter.com/stevefaulkner
> HTML5: Techniques for providing useful text alternatives -
> dev.w3.org/html5/alt-techniques/
> Web Accessibility Toolbar - www.paciellogroup.com/resources/wat-ie-about.html
>
> ****
>