Web Content Accessibility Guidelines (WCAG)

The Web Content Accessibility Guidelines (WCAG) are a set of guidelines for making digital content more accessible for people with disabilities.

Don't be fooled by the name, these guidelines also apply to apps. Which requirements apply to your specific situation depends on where in the world your app is available.

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  EN 301 549

  EN 301 549 is the European standard which describes requirements which apps must meet in order to be accessible.

  EN 301 549 overview
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  Section 508

  Section 508 requires United States federal agencies to make their apps accessible for everyone.

  Section 508 overview

WCAG structure

Version 2.2 of the WCAG consists of 4 principles, 13 guidelines and 87 success criteria. The success criteria are divided into three levels of conformance.

1. Level A: sets a minimum level of accessibility. There are 32 criteria to meet. If your app does not conform with level A, it may have serious accessibility issues. This will likely prevent users with disabilities from being able to use it.

2. Level AA: sets a strong level of accessibility. There are 24 criteria to meet, plus 32 criteria at level A. When your app conforms to level AA, users with disabilities will likely be able to use it.

3. Level AAA: sets the highest level of accessibility. There are 31 criteria to meet, plus 56 criteria at level A and AA. Note: it's not possible to satisfy level AAA for all content.

We recommend meeting at least level AA, and level AAA where possible.

WCAG guidance

Looking for an easy way to get started with WCAG? Check out our beginner guides.

• 

  WCAG Beginners' Guide

  New to WCAG? Start here.

  WCAG Beginners' Guide
• 

  Beginners' Guide to Accessibility Testing

  Test whether your app is accessible yourself.

  Beginners' Guide to Accessibility Testing
• 

  App accessibility handbook

  Our handbook is designed to learn the basic principles of app accessibility in straightforward way.

  App accessibility handbook

The list below contains links to our guides for each principle, guideline and success criterion.

• Principle 1 - Perceivable

  • Guideline 1.1 - Text Alternatives

    • Success Criterion 1.1.1 - Non-text Content - Level A

  • Guideline 1.2 - Time-based Media

    • Success Criterion 1.2.1 - Audio-only and Video-only (Prerecorded) - Level A

    • Success Criterion 1.2.2 - Captions (Prerecorded) - Level A

    • Success Criterion 1.2.3 - Audio Description or Media Alternative (Prerecorded) - Level A

    • Success Criterion 1.2.4 - Captions (Live) - Level AA

    • Success Criterion 1.2.5 - Audio Description (Prerecorded) - Level AA

    • Success Criterion 1.2.6 - Sign Language (Prerecorded) - Level AAA

    • Success Criterion 1.2.7 - Extended Audio Description (Prerecorded) - Level AAA

    • Success Criterion 1.2.8 - Media Alternative (Prerecorded) - Level AAA

    • Success Criterion 1.2.9 - Audio-only (Live) - Level AAA

  • Guideline 1.3 - Adaptable

    • Success Criterion 1.3.1 - Info and Relationships - Level A

    • Success Criterion 1.3.2 - Meaningful Sequence - Level A

    • Success Criterion 1.3.3 - Sensory Characteristics - Level A

    • Success Criterion 1.3.4 - Orientation - Level AA

    • Success Criterion 1.3.5 - Identify Input Purpose - Level AA

    • Success Criterion 1.3.6 - Identify Purpose - Level AA

  • Guideline 1.4 - Distinguishable

    • Success Criterion 1.4.1 - Use of Color - Level A

    • Success Criterion 1.4.2 - Audio Control - Level A

    • Success Criterion 1.4.3 - Contrast (Minimum) - Level AA

    • Success Criterion 1.4.4 - Resize Text - Level AA

    • Success Criterion 1.4.5 - Images of Text - Level AA

    • Success Criterion 1.4.6 - Contrast (Enhanced) - Level AAA

    • Success Criterion 1.4.7 - Low or No Background Audio - Level AAA

    • Success Criterion 1.4.8 - Visual Presentation - Level AAA

    • Success Criterion 1.4.9 - Images of Text (No Exception) - Level AAA

    • Success Criterion 1.4.10 - Reflow - Level AA

    • Success Criterion 1.4.11 - Non-text Contrast - Level AA

    • Success Criterion 1.4.12 - Text Spacing - Level AA

    • Success Criterion 1.4.13 - Content on Hover or Focus - Level AA

• Principle 2 - Operable

  • Guideline 2.1 - Keyboard Accessible

    • Success Criterion 2.1.1 - Keyboard - Level A

    • Success Criterion 2.1.2 - No Keyboard Trap - Level A

    • Success Criterion 2.1.3 - Keyboard (No Exception) - Level AAA

    • Success Criterion 2.1.4 - Character Key Shortcuts - Level A

  • Guideline 2.2 - Enough Time

    • Success Criterion 2.2.1 - Timing Adjustable - Level A

    • Success Criterion 2.2.2 - Pause, Stop, Hide - Level A

    • Success Criterion 2.2.3 - No Timing - Level AAA

    • Success Criterion 2.2.4 - Interruptions - Level AAA

    • Success Criterion 2.2.5 - Re-authenticating - Level AAA

    • Success Criterion 2.2.6 - Timeouts - Level AAA

  • Guideline 2.3 - Seizures and Physical Reactions

    • Success Criterion 2.3.1 - Three Flashes or Below Threshold - Level A

    • Success Criterion 2.3.2 - Three Flashes - Level AAA

    • Success Criterion 2.3.3 - Animation from Interactions - Level AAA

  • Guideline 2.4 - Navigable

    • Success Criterion 2.4.1 - Bypass Blocks - Level A

    • Success Criterion 2.4.2 - Page Titled - Level A

    • Success Criterion 2.4.3 - Focus Order - Level A

    • Success Criterion 2.4.4 - Link Purpose (In Context) - Level A

    • Success Criterion 2.4.5 - Multiple Ways - Level AA

    • Success Criterion 2.4.6 - Headings and Labels - Level AA

    • Success Criterion 2.4.7 - Focus Visible - Level AA

    • Success Criterion 2.4.8 - Location - Level AAA

    • Success Criterion 2.4.9 - Link Purpose (Link Only) - Level AAA

    • Success Criterion 2.4.10 - Section Headings - Level AAA

    • Success Criterion 2.4.11 - Focus Not Obscured (Minimum) - Level AA

    • Success Criterion 2.4.12 - Focus Not Obscured (Enhanced) - Level AAA

    • Success Criterion 2.4.13 - Focus Appearance - Level AAA

  • Guideline 2.5 - Input Modalities

    • Success Criterion 2.5.1 - Pointer Gestures - Level A

    • Success Criterion 2.5.2 - Pointer Cancellation - Level A

    • Success Criterion 2.5.3 - Label in Name - Level A

    • Success Criterion 2.5.4 - Motion Actuation - Level A

    • Success Criterion 2.5.5 - Target Size - Level AAA

    • Success Criterion 2.5.6 - Concurrent Input Mechanisms - Level AAA

    • Success Criterion 2.5.7 - Dragging Movements - Level AA

    • Success Criterion 2.5.8 - Target Size (Minimum) - Level AA

• Principle 3 - Understandable

  • Guideline 3.1 - Readable

    • Success Criterion 3.1.1 - Language of Page - Level A

    • Success Criterion 3.1.2 - Language of Parts - Level AA

    • Success Criterion 3.1.3 - Unusual Words - Level AAA

    • Success Criterion 3.1.4 - Abbreviations - Level AAA

    • Success Criterion 3.1.5 - Reading Level - Level AAA

    • Success Criterion 3.1.6 - Pronunciation - Level AAA

  • Guideline 3.2 - Predictable

    • Success Criterion 3.2.1 - On Focus - Level A

    • Success Criterion 3.2.2 - On Input - Level A

    • Success Criterion 3.2.3 - Consistent Navigation - Level AA

    • Success Criterion 3.2.4 - Consistent Identification - Level AA

    • Success Criterion 3.2.5 - Change on Request - Level AAA

    • Success Criterion 3.2.6 - Consistent Help - Level A

  • Guideline 3.3 - Input Assistance

    • Success Criterion 3.3.1 - Error Identification - Level A

    • Success Criterion 3.3.2 - Labels or Instructions - Level A

    • Success Criterion 3.3.3 - Error Suggestion - Level AA

    • Success Criterion 3.3.4 - Error Prevention (Legal, Financial, Data) - Level AA

    • Success Criterion 3.3.5 - Help - Level AAA

    • Success Criterion 3.3.6 - Error Prevention (All) - Level AAA

    • Success Criterion 3.3.7 - Redundant Entry - Level A

    • Success Criterion 3.3.8 - Accessible Authentication (Minimum) - Level AA

    • Success Criterion 3.3.9 - Accessible Authentication (Enhanced) - Level AAA

• Principle 4 - Robust

  • Guideline 4.1 - Compatible

    • Success Criterion 4.1.1 - Parsing - Level A

    • Success Criterion 4.1.2 - Name, Role, Value - Level A

    • Success Criterion 4.1.3 - Status Messages - Level AA

Resources

• Web Content Accessibility Guidelines (WCAG) 2.2