Quick reference: Web Content Accessibility Guidelines (WCAG) 2.0

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Level A

Level AA

Level AAA

Conformance requirements

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Principles, guidelines and success criteria

Principle 1 - Perceivable - Information and user interface components must be presentable to users in ways they can perceive.

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]

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]

Principle 2 - Operable - User interface components and navigation must be 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]

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]

Guideline 2.3 - Seizures

• Success criterion 2.3.1 - Three Flashes or Below Threshold [Level A]
• Success criterion 2.3.2 - Three Flashes [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]

Principle 3 - Understandable - Information and the operation of user interface must be 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]

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]

Principle 4 - Robust - Content must be robust enough that it can be interpreted reliably by a wide variety of user agents, including assistive technologies.

Guideline 4.1 - Compatible

• Success criterion 4.1.1 - Parsing [Level A]
• Success criterion 4.1.2 - Name, Role, Value [Level A]

Conformance Requirements

In order for a Web page to conform to WCAG 2.0, all of the following conformance requirements must be satisfied:

• Conformance requirement 1 - Conformance Level
• Conformance requirement 2 - Full pages
• Conformance requirement 3 - Complete processes
• Conformance requirement 4 - Only Accessibility-Supported Ways of Using Technologies
• Conformance requirement 5 - Non-Interference