IMPORTANT: Instructions

Please read carefully the Instructions for the "Benefits of WCAG 2" Presentation at www.w3.org/WAI/presentations/WCAG20_benefits/ for an introduction, tips, and permission to use.

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Benefits of

Web Content Accessibility Guidelines

WCAG 2

*DRAFT* Last Updated 13 July 2009

WCAG 2 is

 Web Content Accessibility Guidelines 2.0  Web “content” = web pages, websites, web applications, …

WCAG 2 gives you

 Cooperatively developed international standard  Applies to more advanced technologies  Clearer criteria  Flexible, adaptable  Practical implementation examples and info

Who develops WCAG

 Standards making body for the Web  International, multi-stakeholder development  Formal process for broad public review

How WCAG is developed, Stage 1

WCAG Working Group development WCAG 2 Working Draft Public review and comment

Milestones

 Public Working Drafts  Last Call Working Draft  Candidate Recommendation -

Implementations

 Proposed Recommendation  W3C Recommendation=Web Standard

December 2008

Cooperation with accessibility policies

Integrated Accessibility Guidelines



WCAG for web content

 ATAG for authoring tools, HTML editors, content management systems (CMS), blogs, wikis, etc.

 UAAG for web browsers, media players, and other ‘user agents’ 

WAI-ARIA for accessible rich Internet

applications developed with Ajax and such

Authorized Translations

 Policy for Authorized W3C Translations  WCAG 2.0 Translations

www.w3.org/WAI/WCAG20/translations

Cooperatively developed International standard

 W3C Web Accessibility Initiative (WAI)  W3C process designed to: ensure broad public input, and encourage consensus development  Cooperation with accessibility policies  Integrated Web accessibility standards suite  Authorized Translations

WCAG 2 gives you



Advances from WCAG 1 to WCAG 2

WCAG 2 gives you



Applies to more advanced technologies

- current, future, non-W3C

WCAG 2

www.w3.org/TR/WCAG20/  W3C Web Standard  Stable  Technology-independent, broadly applicable  Defines functionality required by users

 Supporting document, “informative”  Can be updated

WCAG 2 gives you



Clearer “success criteria”, more precisely testable

(still need human judgment)

Testable Example



WCAG 1.0 Checkpoint

2.2 Ensure that foreground and background color combinations provide sufficient contrast when viewed by someone having color deficits…

Questionable color contrast:

Testable Example



WCAG 1.0 Checkpoint

2.2 Ensure that foreground and background color combinations provide sufficient contrast when viewed by someone having color deficits… 

WCAG 2 Success Criteria



1.4.3 The visual presentation of text and images of text has a contrast ratio of at least 4.5:1…

WCAG 2 gives you



Adaptable, flexible

for different situations, and developing technologies and techniques Techniques for different situations can use other techniques

More design flexibility, e.g.:

  WCAG 1.0

Until user agents allow users to …  7.1 ... avoid causing the screen to flicker.

  7.2 ... avoid causing content to blink… 7.3 ... avoid movement in pages.

WCAG 2 allows more movement within defined parameters

 2.2.2 Blinking…    2.2.3 Pausing… 2.3.1 Three Flashes or Below Threshold… 2.3.2 Three Flashes…

Scripting allowed!

Scripting Techniques

 Providing client-side validation and alert  Providing a script that warns the user a time limit is about to expire  Using progressive enhancement to open new windows on user request  Using functions of the Document Object Model (DOM) to add content to a page  . . .

Flexibility for rich Internet applications (Ajax, DHTML)

 WAI-ARIA: Accessible Rich Internet Applications Suite  For example, accessible and highly usable expanding and collapsing menus/tree controls/nav bars  Techniques for meeting WCAG 2

Adaptability through accessibility-supported technologies

WCAG 2 gives you



Extensive supporting materials, practical implementation guidance

 Supporting document, “informative”  Can be updated

 Lists the WCAG 2 requirements  Provides summary information from the other documents  Links to details

Additional support



Overview of WCAG 2 Documents www.w3.org/WAI/intro/wcag



WCAG 2 FAQ



WCAG 2 at a Glance

 WCAG 2 transition documents: 

How WCAG 2 Differs from WCAG 1



Comparison of WCAG 1 to WCAG 2



How to Update Your Website

Questions?

 WAI home page

www.w3.org/WAI

 WAI Interest Group

www.w3.org/WAI/IG/

Source Material

Benefits of WCAG 2

Web Content Accessibility Guidelines W3C WAI Education and Outreach Working Group

www.w3.org/WAI/presentations/ WCAG20_benefits/

Benefits of WCAG 2

 Cooperatively developed international standard  Applies to more advanced Web technologies  current, future, non-W3C  Clearer criteria, more precisely testable  Adaptable, flexible for different situations, and developing technologies and techniques  Extensive supporting materials, practical implementation guidance

WCAG 2 benefits you!