The structure of Web Content Accessibility Guidelines (WCAG) 2.1
Following these guidelines will make content more accessible to a wider range of people with disabilities, including accommodations for blindness and low vision, deafness and hearing loss, limited movement, speech disabilities, photosensitivity, and combinations of these, and some accommodation for learning disabilities and cognitive limitations; but will not address every user need for people with these disabilities.
Principle 1 – Perceivable
Guideline 1.1 – Text Alternatives
- Success Criteria 1.1.1 Non-text Content (a)
Guideline 1.2 – Time-Based Media
- Success Criteria 1.2.1 audio-only and video-only (prerecorded) (a)
- Success Criteria 1.2.2 captions (prerecorded) (a)
- Success Criteria 1.2.3 audio description or media alternative (prerecorded) (a)
- Success Criteria 1.2.4 captions (live) (aa)
- Success Criteria 1.2.5 audio description (prerecorded) (aa)
Guideline 1.3 – Adaptable
- Success Criteria 1.3.1 info and relationships (a)
- Success Criteria 1.3.2 meaningful sequence (a)
- Success Criteria 1.3.3 sensory characteristics (a)
- Success Criteria 1.3.4 orientation (aa)
- Success Criteria 1.3.5 identify input purpose (aa)
Guideline 1.4 – Distinguishable
- Success Criteria 1.4.1 use of color (a)
- Success Criteria 1.4.2 audio control (a)
- Success Criteria 1.4.3 contrast (minimum) (aa)
- Success Criteria 1.4.4 resize text (aa)
- Success Criteria 1.4.5 images of text (aa)
- Success Criteria 1.4.10 reflow (aa)
- Success Criteria 1.4.11 non-text contrast (aa)
- Success Criteria 1.4.12 text spacing (aa)
- Success Criteria 1.4.13 content on hover or focus (aa)
Principle 2 – Operable
Guideline 2.1 – Keyboard Accessible
- Success Criteria 2.1.1 keyboard (a)
- Success Criteria 2.1.2 no keyboard trap (a)
- Success Criteria 2.1.4 character key shortcuts (a)
Guideline 2.2 – Enough Time
- Success Criteria 2.2.1 timing adjustable (a)
- Success Criteria 2.2.2 pause, stop, hide (a)
Guideline 2.3 – Seizures
- Success Criteria 2.3.1 three flashes or below threshold (a)
Guideline 2.4 – Navigable
- Success Criteria 2.4.1 bypass blocks (a)
- Success Criteria 2.4.2 page titled (a)
- Success Criteria 2.4.3 focus order (a)
- Success Criteria 2.4.4 link Purpose (in context) (a)
- Success Criteria 2.4.5 multiple ways (aa)
- Success Criteria 2.4.6 headings and labels (aa)
- Success Criteria 2.4.7 focus visible (aa)
Guideline 2.5 – Input Modalities
- Success Criteria 2.5.1 pointer gestures (a)
- Success Criteria 2.5.2 pointer cancellation (a)
- Success Criteria 2.5.3 label in name (a)
- Success Criteria 2.5.4 motion actuation (a)
Principle 3 – Understandable
Guideline 3.1 – Readable
- Success Criteria 3.1.1 language of page (a)
- Success Criteria 3.1.2 language of parts (aa)
Guideline 3.2 – Predictable
- Success Criteria 3.2.1 on focus (a)
- Success Criteria 3.2.2 on input (a)
- Success Criteria 3.2.3 consistent navigation (aa)
- Success Criteria 3.2.4 consistent identification (aa)
Guideline 3.3 – Input Assistance
- Success Criteria 3.3.1 error identification (a)
- Success Criteria 3.3.2 labels or instructions (a)
- Success Criteria 3.3.3 error suggestion (aa)
- Success Criteria 3.3.4 error prevention (legal, financial, data) (aa)
Principle 4 – Robust
Guideline 4.1 – Compatible
- Success Criteria 4.1.1 parsing (a)
- Success Criteria 4.1.3 status messages (aa)
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