WCAG 2.0 A/AA Has 38 Checkpoints, Categorized by 4 Principles
Principle 1: Perceivable
Information and user interface components must be presented to users in ways they can perceive. This means that users must be able to comprehend the information being depicted: It can't be invisible to all their senses.
- Checkpoint 1.1.1: Nontext Content Level (A)
- Checkpoint 1.2.1: Prerecorded Audio only and Video-only Level (A)
- Checkpoint 1.2.2: Captions (Prerecorded) Level (A)
- Checkpoint 1.2.3: Audio Description or Media Alternative (Prerecorded) Level (A)
- Checkpoint 1.2.4: Captions (Live) Level (AA)
- Checkpoint 1.2.5: Audio Description (Prerecorded) Level (AA)
- Checkpoint 1.3.1: Info and Relationships Level (A)
- Checkpoint 1.3.2: Meaningful Sequence Level (A)
- Checkpoint 1.3.3: Sensory Characteristics Level (A)
- Checkpoint 1.4.1: Use of Color Level (A)
- Checkpoint 1.4.2: Audio Control Level (A)
- Checkpoint 1.4.3: Contrast (Minimum) Level (AA)
- Checkpoint 1.4.4: Resize text Level (AA)
- Checkpoint 1.4.5: Images of Text Level (AA)
Principle 2: Operable
User interface components and navigation must be operable: The interface cannot require interaction that a user cannot perform.
- Checkpoint 2.1.1 Keyboard Level (A)
- Checkpoint 2.1.2: No Keyboard Trap Level (A)
- Checkpoint 2.2.1: Timing Adjustable Level (A)
- Checkpoint 2.2.2: Pause, Stop, Hide Level (AA)
- Checkpoint 2.3.1: Three Flashes or Below Threshold Level (A)
- Checkpoint 2.4.1: Bypass Blocks Level (A)
- Checkpoint 2.4.2: Page Titled Level (A)
- Checkpoint 2.4.3: Focus Order Level (A)
- Checkpoint 2.4.4: Link Purpose (In Context) Level (A)
- Checkpoint 2.4.5: Multiple Ways Level (AA)
- Checkpoint 2.4.6: Headings and Labels Level (AA)
- Checkpoint 2.4.7: Focus Visible Level (AA)
Principle 3: Understandable
Information and the operation of a user interface must be understandable: Users must be able to understand the information as well as the operation of the user interface.
- Checkpoint 3.1.1: Language of Page Level (A)
- Checkpoint 3.1.2: Language of Parts Level (AA)
- Checkpoint 3.2.1: On Focus Level (A)
- Checkpoint 3.2.2: On Input Level (A)
- Checkpoint 3.2.3: Consistent Navigation Level (AA)
- Checkpoint 3.2.4: Consistent Identification Level (AA)
- Checkpoint 3.3.1: Error Identification Level (A)
- Checkpoint 3.3.2: Labels or Instructions Level (A)
- Checkpoint 3.3.3: Error Suggestion Level (AA)
- Checkpoint 3.3.4: Error Prevention (Legal, Financial, Data) Level (AA)
Principle 4: Robust
Content must be robust enough that it can be interpreted reliably by a wide variety of user agents, including assistive technologies: As technologies and user agents evolve, the content should remain accessible.
