WCAG 2.1 success criteria

All 78criteria from the W3C's Web Content Accessibility Guidelines, explained in plain English with failing and passing code examples — and how OnlyEnable handles each one.

Level A · 30 criteriaLevel AA · 20 criteriaLevel AAA · 28 criteria

Perceivable29 criteria

1.1.1ANon-text Content1.1 Text Alternatives 1.2.1AAudio-only and Video-only (Prerecorded)1.2 Time-based Media 1.2.2ACaptions (Prerecorded)1.2 Time-based Media 1.2.3AAudio Description or Media Alternative (Prerecorded)1.2 Time-based Media 1.2.4AACaptions (Live)1.2 Time-based Media 1.2.5AAAudio Description (Prerecorded)1.2 Time-based Media 1.2.6AAASign Language (Prerecorded)1.2 Time-based Media 1.2.7AAAExtended Audio Description (Prerecorded)1.2 Time-based Media 1.2.8AAAMedia Alternative (Prerecorded)1.2 Time-based Media 1.2.9AAAAudio-only (Live)1.2 Time-based Media 1.3.1AInfo and Relationships1.3 Adaptable 1.3.2AMeaningful Sequence1.3 Adaptable 1.3.3ASensory Characteristics1.3 Adaptable 1.3.4AAOrientation1.3 Adaptable 1.3.5AAIdentify Input Purpose1.3 Adaptable 1.3.6AAAIdentify Purpose1.3 Adaptable 1.4.1AUse of Color1.4 Distinguishable 1.4.2AAudio Control1.4 Distinguishable 1.4.3AAContrast (Minimum)1.4 Distinguishable 1.4.4AAResize Text1.4 Distinguishable 1.4.5AAImages of Text1.4 Distinguishable 1.4.6AAAContrast (Enhanced)1.4 Distinguishable 1.4.7AAALow or No Background Audio1.4 Distinguishable 1.4.8AAAVisual Presentation1.4 Distinguishable 1.4.9AAAImages of Text (No Exception)1.4 Distinguishable 1.4.10AAReflow1.4 Distinguishable 1.4.11AANon-text Contrast1.4 Distinguishable 1.4.12AAText Spacing1.4 Distinguishable 1.4.13AAContent on Hover or Focus1.4 Distinguishable

Operable29 criteria

2.1.1AKeyboard2.1 Keyboard Accessible 2.1.2ANo Keyboard Trap2.1 Keyboard Accessible 2.1.3AAAKeyboard (No Exception)2.1 Keyboard Accessible 2.1.4ACharacter Key Shortcuts2.1 Keyboard Accessible 2.2.1ATiming Adjustable2.2 Enough Time 2.2.2APause, Stop, Hide2.2 Enough Time 2.2.3AAANo Timing2.2 Enough Time 2.2.4AAAInterruptions2.2 Enough Time 2.2.5AAARe-authenticating2.2 Enough Time 2.2.6AAATimeouts2.2 Enough Time 2.3.1AThree Flashes or Below Threshold2.3 Seizures and Physical Reactions 2.3.2AAAThree Flashes2.3 Seizures and Physical Reactions 2.3.3AAAAnimation from Interactions2.3 Seizures and Physical Reactions 2.4.1ABypass Blocks2.4 Navigable 2.4.2APage Titled2.4 Navigable 2.4.3AFocus Order2.4 Navigable 2.4.4ALink Purpose (In Context)2.4 Navigable 2.4.5AAMultiple Ways2.4 Navigable 2.4.6AAHeadings and Labels2.4 Navigable 2.4.7AAFocus Visible2.4 Navigable 2.4.8AAALocation2.4 Navigable 2.4.9AAALink Purpose (Link Only)2.4 Navigable 2.4.10AAASection Headings2.4 Navigable 2.5.1APointer Gestures2.5 Input Modalities 2.5.2APointer Cancellation2.5 Input Modalities 2.5.3ALabel in Name2.5 Input Modalities 2.5.4AMotion Actuation2.5 Input Modalities 2.5.5AAATarget Size2.5 Input Modalities 2.5.6AAAConcurrent Input Mechanisms2.5 Input Modalities

Understandable17 criteria

3.1.1ALanguage of Page3.1 Readable 3.1.2AALanguage of Parts3.1 Readable 3.1.3AAAUnusual Words3.1 Readable 3.1.4AAAAbbreviations3.1 Readable 3.1.5AAAReading Level3.1 Readable 3.1.6AAAPronunciation3.1 Readable 3.2.1AOn Focus3.2 Predictable 3.2.2AOn Input3.2 Predictable 3.2.3AAConsistent Navigation3.2 Predictable 3.2.4AAConsistent Identification3.2 Predictable 3.2.5AAAChange on Request3.2 Predictable 3.3.1AError Identification3.3 Input Assistance 3.3.2ALabels or Instructions3.3 Input Assistance 3.3.3AAError Suggestion3.3 Input Assistance 3.3.4AAError Prevention (Legal, Financial, Data)3.3 Input Assistance 3.3.5AAAHelp3.3 Input Assistance 3.3.6AAAError Prevention (All)3.3 Input Assistance

Robust3 criteria

4.1.1AParsing4.1 Compatible 4.1.2AName, Role, Value4.1 Compatible 4.1.3AAStatus Messages4.1 Compatible