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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

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

How WCAG is developed, Stage 1 WCAG Working Group development Public review and comment WCAG 2 Working Draft

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

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  W3C Web Standard  Stable  Technology-independent, broadly applicable  Defines functionality required by users

Techniques document  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  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 …  avoid causing the screen to flicker.  avoid causing content to blink…  avoid movement in pages.  WCAG 2 allows more movement within defined parameters  Blinking…  Pausing…  Three Flashes or Below Threshold…  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

Understanding document  Supporting document, “informative”  Can be updated

How to Meet WCAG 2 Quick Ref  Lists the WCAG 2 requirements  Provides summary information from the other documents  Links to details

Quick Reference screen shot

Additional support  Overview of WCAG 2 Documents  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  WAI Interest Group

Source Material Benefits of WCAG 2 Web Content Accessibility Guidelines W3C WAI Education and Outreach Working Group 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!

About this presentation Please read carefully the Instructions for the "Benefits of WCAG 2" Presentation at for an introduction, tips, and permission to use. Copyright © W3C® (MIT, ERCIM, Keio)