1. Perceivable
   1. Text Alternatives
      1. Non-text Content
         1. Controls, Input
         2. Time-Based Media
         3. Test
         4. Sensory
         5. CAPTCHA
         6. Decoration, Formatting, Invisible
   2. Time-Based Media
      1. Audio-only and Video-only (Prerecorded)
         1. Prerecorded Audio-only
         2. Prerecorded Video-only
      2. Captions (Prerecorded)
      3. Audio Description or Media Alternative (Prerecorded)
      4. Captions (Live)
      5. Audio Description (Prerecorded)
      6. Sign Language (Prerecorded)
      7. Extended Audio Description (Prerecorded)
      8. Media Alternative (Prerecorded)
      9. Audio-only (Live)
   3. Adaptable
      1. Info and Relationships
      2. Meaningful Sequence
      3. Sensory Characteristics
      4. Orientation
      5. Identify Input Purpose
      6. Identify Purpose
   4. Distinguishable
      1. Use of Color
      2. Audio Control
      3. Contrast (Minimum)
         1. Large Text
         2. Incidental
         3. Logotypes
      4. Resize text
      5. Images of Text
         1. Customizable
         2. Essential
      6. Contrast (Enhanced)
         1. Large Text
         2. Incidental
         3. Logotypes
      7. Low or No Background Audio
         1. No Background
         2. Turn Off
         3. 20 dB
      8. Visual Presentation
         1. Foreground and background colors can be selected by the user
         2. Width is no more than 80 characters or glyphs (40 if CJK)
         3. Text is not justified (aligned to both the left and the right margins)
         4. Line spacing (leading) is at least space-and-a-half within paragraphs, and paragraph spacing is at least 1.5 times larger than the line spacing
         5. Text can be resized without assistive technology up to 200 percent in a way that does not require the user to scroll horizontally to read a line of text on a full-screen window.
      9. Images of Text (No Exception)
      10. Reflow
      11. Non-Text Contrast
      12. Text Spacing
      13. Content on Hover or Focus
2. Operable
   1. Keyboard Accessible
      1. Keyboard
      2. No Keyboard Trap
      3. Keyboard (No Exception)
      4. Character Key Shortcuts
   2. Enough Time
      1. Timing Adjustable
         1. Turn off
         2. Adjust
         3. Extend
         4. Real-time Exception
         5. Essential Exception
         6. 20 Hour Exception
      2. Pause, Stop, Hide
         1. Auto-updating
      3. No Timing
      4. Interruptions
      5. Re-authenticating
      6. Timeouts
   3. Seizures
      1. Three Flashes or Below Threshold
      2. Three Flashes
      3. Animation from Interactions
   4. Navigable
      1. Bypass Blocks
      2. Page Titled
      3. Focus Order
      4. Link Purpose (In Context)
      5. Multiple Ways
      6. Headings and Labels
      7. Focus Visible
      8. Location
      9. Link Purpose (Link Only)
      10. Section Headings
   5. Input Modifiers
      1. Pointer Gestures
      2. Pointer Cancellation
      3. Label in Name
      4. Motion Actuation
      5. Target Size
      6. Concurrent Input Mechanisms
3. Understandable
   1. Readable
      1. Language of Page
      2. Language of Parts
      3. Unusual Words
      4. Abbreviations
      5. Reading Level
      6. Pronunciation
   2. Predictable
      1. On Focus
      2. On Input
      3. Consistent Navigation
      4. Consistent Identification
      5. Change on Request
   3. Input Assistance
      1. Error Identification
      2. Labels or Instructions
      3. Error Suggestion
      4. Error Prevention (Legal, Financial, Data)
         1. Reversible
         2. Checked
         3. Confirmed
      5. Help
      6. Error Prevention (All)
         1. Reversible
         2. Checked
         3. Confirmed
4. Robust
   1. Compatible
      1. Parsing
      2. Name, Role, Value
      3. Status Messages
5. Conformance
   1. Conformance Requirements
      1. Conformance Level
         1. Level A
         2. Level AA
         3. Level AAA
      2. Full pages
      3. Complete processes
      4. Only Accessibility-Supported Ways of Using Technologies
      5. Non-Interference
         1. Moving, blinking, scrolling
   2. Conformance Claims (Optional)
      1. Required Components of a Conformance Claim
      2. Optional Components of a Conformance Claim
      3. Statement of Partial Conformance - Third Party Content
      4. Statement of Partial Conformance - Language