About WCAG 2

Web Content Accessibility Guidelines (WCAG) is developed through international collaboration:

• Experts
• Researchers
• Developers
• Industry
• Policy makers
• End-users

Design of WCAG 2

• Technology-independent
• Objectively testable
• Flexible for situations
• Support for developers

WCAG 2 Structure

• Principles (4)
  • Guidelines (12)
    • Success Criteria - Level A (25)
    • Success Criteria - Level AA (13)
    • Success Criteria - Level AAA (23)
• Conformance

Note: WCAG 1.0 had 14 Guidelines and 65 Checkpoints

WCAG 2 Principles

Accessibility principles of WCAG 2:

• Perceivable
• Operable
• Understandable
• Robust

To help memorize: P-O-U-R like pouring water.

Example Guidelines

Examples of WCAG 2 Guidelines:

• Guidelines 2.1 Keyboard Accessible: Make all functionality available from a keyboard
• Guideline 3.3 Input Assistance: Help users avoid and correct mistakes

Example Success Criteria

Examples of WCAG 2 Success Criteria:

• 1.1.1 Non-text Content: All non-text content that is presented to the user has a text alternative that serves the equivalent purpose - Level A
• 2.2.4 Interruptions: Interruptions can be postponed or suppressed by the user, except interruptions involving an emergency - Level AAA

WCAG 2 Techniques

Techniques are documented separately. There are three types of Techniques:

• Sufficient Techniques - minimum requirements
• Advisory Techniques - additional improvements
• Common Failures - often encountered mistakes

Techniques are Technology-specific (e.g. HTML, CSS, AJAX, ...)

Example Technique

Contents of WCAG 2 Technique "H36 - Using alt attributes on images used as submit buttons":

• Applicability
• Description
• Examples
• Resources
• Related Techniques
• Tests

Example Test Procedure

Test procedure from WCAG 2 Technique H36:

Procedure

1. For all input elements that have a type attribute value of "image", check for the presence of an alt attribute.
2. Check that the alt attribute indicates the button's function.

Expected Results

#1 und #2 are true

WCAG 2 Hierarchy

• Principles (POUR)
  • Guidelines (12)
    • Success Criteria (61)
      • Techniques (documented separately)

How To Meet WCAG 2.0

http://www.w3.org/WAI/WCAG20/quickref/:

WCAG 2.0 Quick Reference

Questions?

Quick clarification questions welcome now.
Next: Text Alternatives (after the break).