The four principles of WCAG 2.1 are perceivable, operable, understandable, and robust. Under each of these four principles there are twelve guidelines.
Under the twelve guidelines there is a series of testable success criteria. This guide identifies all of the testable success criteria. Each success criteria contains a link to understand more information about the criteria and how to test each one.
Information and user interface components must be presentable to users in ways they can perceive.
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)
1.3.1 Info and Relationships
1.3.2 Meaningful Sequence
1.3.3 Sensory Charateristics
1.3.4 Orientation (New in WCAG 2.1)
1.3.5 Identify Input Purpose (New in WCAG 2.1)
1.3.6 Identify Purpose (New in WCAG 2.1)
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
1.4.10 Reflow (New in WCAG 2.1)
1.4.11 Non-Text Contrast (New in WCAG 2.1)
1.4.12 Text Spacing (New in WCAG 2.1)
1.4.13 Content on Hover or Focus (New in WCAG 2.1)
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)
2.1.1 Keyboard
2.1.2 No Keyboard Trap
2.1.4 Character Key Shortcuts (New in WCAG 2.1)
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 (New in WCAG 2.1)
2.3.1 Three Flashes or Below Threshold
2.3.2 Three Flashes
2.3.3 Animation from Interactions (New in WCAG 2.1)
2.4.1 Bypass Blocks
2.4.2 Page Titled
2.4.3 Focus Order
2.4.4 Link Purpose (In Context)
2.4.5 Multiple Ways
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
2.5.1 Pointer Gestures (New in WCAG 2.1)
2.5.2 Pointer Cancellation (New in WCAG 2.1)
2.5.3 Label in Name (New in WCAG 2.1)
2.5.4 Motion Actuation (New in WCAG 2.1)
2.5.5 Target Size (New in WCAG 2.1)
2.5.6 Cocurrent Input Mechanisms (New in WCAG 2.1)
Information and the operation of user interface must be understandable
3.1.3 Unusual Words
3.1.4 Abbreviations
3.1.5 Reading Level
3.1.6 Pronunciation
3.2.3 Consistent Navigation
3.2.4 Consistent Identification
3.3.1 Error Identification
3.3.2 Labels or Instructions
3.3.3 Error Suggestion
3.3.4 Error Prevention (Legal, Financial, Data)
Content must be robust enough that it can be interpreted reliably by a wide variety of user agents, including assistive technologies
4.1.1 Parsing
4.1.2 Name, Role, Value
4.1.3 Status Messages (New in WCAG 2.1)
