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Web Content Accessibility Guidelines
a guide to the accessibility requirements
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1
Perceivable
2
Operable
3
Understandable
4
Robust
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1 Perceivable
1.1 Text Alternatives
1.1.1 Non-text Content
1.2 Time-based Media
1.2.1 Audio-only and Video-only (Prerecorded)
1.2.2 Captions (Prerecorded)
1.2.3 Audio Description or Media Alternative (Prerecorded)
1.2.4 Captions (Live)
1.2.5 Audio Description (Prerecorded)
1.2.6 Sign Language (Prerecorded)
1.2.7 Extended Audio Description (Prerecorded)
1.2.8 Media Alternative (Prerecorded)
1.2.9 Audio-only (Live)
1.3 Adaptable
1.3.1 Info and Relationships
1.3.2 Meaningful Sequence
1.3.3 Sensory Characteristics
1.3.4 Orientation
1.3.5 Identify Input Purpose
1.3.6 Identify Purpose
1.4 Distinguishable
1.4.1 Use of Color
1.4.2 Audio Control
1.4.3 Contrast (Minimum)
1.4.4 Resize Text
1.4.5 Images of Text
1.4.6 Contrast (Enhanced)
1.4.7 Low or No Background Audio
1.4.8 Visual Presentation
1.4.9 Images of Text (No Exception)
1.4.10 Reflow
1.4.11 Non-text Contrast
1.4.12 Text Spacing
1.4.13 Content on Hover or Focus
2 Operable
2.1 Keyboard Accessible
2.1.1 Keyboard
2.1.2 No Keyboard Trap
2.1.3 Keyboard (No Exception)
2.1.4 Character Key Shortcuts
2.2 Enough Time
2.2.1 Timing Adjustable
2.2.2 Pause, Stop, Hide
2.2.3 No Timing
2.2.4 Interruptions
2.2.5 Re-authenticating
2.2.6 Timeouts
2.3 Seizures and Physical Reactions
2.3.1 Three Flashes or Below Threshold
2.3.2 Three Flashes
2.3.3 Animation from Interactions
2.4 Navigable
2.4.1 Bypass Blocks
2.4.2 Page Titled
2.4.3 Focus Order
2.4.4 Link Purpose (In Context)
2.4.6 Headings and Labels
2.4.7 Focus Visible
2.4.8 Location
2.4.9 Link Purpose (Link Only)
2.4.10 Section Headings
2.4.11 Focus Not Obscured (Minimum)
2.4.12 Focus Not Obscured (Enhanced)
2.4.13 Focus Appearance
2.5 Input Modalities
2.5.1 Pointer Gestures
2.5.2 Pointer Cancellation
2.5.3 Label in Name
2.5.4 Motion Actuation
2.5.5 Target Size (Enhanced)
2.5.6 Concurrent Input Mechanisms
2.5.7 Dragging Movements
2.5.8 Target Size (Minimum)
3 Understandable
3.1 Readable
3.1.1 Language of Page
3.1.2 Language of Parts
3.1.3 Unusual Words
3.1.4 Abbreviations
3.1.5 Reading Level
3.1.6 Pronunciation
3.2 Predictable
3.2.1 On Focus
3.2.2 On Input
3.2.3 Consistent Navigation
3.2.4 Consistent Identification
3.2.5 Change on Request
2.4.5 Multiple Ways
3.2.6 Consistent Help
3.3 Input Assistance
3.3.1 Error Identification
3.3.2 Labels or Instructions
3.3.3 Error Suggestion
3.3.4 Error Prevention (Legal, Financial, Data)
3.3.5 Help
3.3.6 Error Prevention (All)
3.3.7 Redundant Entry
3.3.8 Accessible Authentication (Minimum)
3.3.9 Accessible Authentication (Enhanced)
4 Robust
4.1 Compatible
4.1.1 Parsing (Obsolete and removed)
4.1.2 Name, Role, Value
4.1.3 Status Messages