Coverage legend: PASS = fully auto-fixed by remediation engine · PARTIAL = detected and partially auto-fixed, may require manual review · MANUAL = detected but requires human judgment (Enterprise tier covers these)
The scale of the problem this list is solving: WebAIM's 2025 scan of the top one million websites found 94.8% had detectable WCAG failures, averaging 51 errors per page. The criterion-by-criterion breakdown below is the actual remediation that runs against that baseline.
Perceivable (Principle 1)
PARTIAL1.1.1 Non-text Content (alt text)
MANUAL1.2.1 Audio-only and Video-only (Prerecorded)
MANUAL1.2.2 Captions (Prerecorded)
MANUAL1.2.3 Audio Description or Media Alternative
MANUAL1.2.4 Captions (Live)
MANUAL1.2.5 Audio Description (Prerecorded)
PASS1.3.1 Info and Relationships (landmarks, headings)
PASS1.3.2 Meaningful Sequence
MANUAL1.3.3 Sensory Characteristics
PASS1.3.4 Orientation
PASS1.3.5 Identify Input Purpose (autocomplete)
PARTIAL1.4.1 Use of Color
MANUAL1.4.2 Audio Control
PARTIAL1.4.3 Contrast (Minimum)
PASS1.4.4 Resize Text
PARTIAL1.4.5 Images of Text
PASS1.4.10 Reflow
PARTIAL1.4.11 Non-text Contrast
PASS1.4.12 Text Spacing
MANUAL1.4.13 Content on Hover or Focus
Operable (Principle 2)
PARTIAL2.1.1 Keyboard
MANUAL2.1.2 No Keyboard Trap
PASS2.1.4 Character Key Shortcuts
MANUAL2.2.1 Timing Adjustable
PASS2.2.2 Pause, Stop, Hide
MANUAL2.3.1 Three Flashes or Below
PASS2.4.1 Bypass Blocks (skip-nav)
PASS2.4.2 Page Titled
PASS2.4.3 Focus Order (tabindex cleanup)
PARTIAL2.4.4 Link Purpose (In Context)
PASS2.4.5 Multiple Ways
PARTIAL2.4.6 Headings and Labels
PASS2.4.7 Focus Visible
PASS2.5.1 Pointer Gestures
PASS2.5.2 Pointer Cancellation
PASS2.5.3 Label in Name
PASS2.5.4 Motion Actuation
Understandable (Principle 3)
PASS3.1.1 Language of Page
PARTIAL3.1.2 Language of Parts
PASS3.2.1 On Focus
PASS3.2.2 On Input
PASS3.2.3 Consistent Navigation
PASS3.2.4 Consistent Identification
PASS3.3.1 Error Identification
PARTIAL3.3.2 Labels or Instructions (form labels)
MANUAL3.3.3 Error Suggestion
MANUAL3.3.4 Error Prevention
Robust (Principle 4)
PASS4.1.1 Parsing
PARTIAL4.1.2 Name, Role, Value (keyboard handlers)
PARTIAL4.1.3 Status Messages
The Six Failures Behind Most WCAG Violations
From the same WebAIM Million 2025 study: six violation types account for the overwhelming majority of WCAG failures across the top one million sites. All six are PASS or PARTIAL in the coverage list above — meaning the auto-fix engine targets exactly the issues that produce the most lawsuit exposure on the open web.
79.1%
of pages affected
Low Color Contrast
The single most common WCAG failure on the web. Body text must meet a 4.5:1 contrast ratio against its background (3:1 for large text). Covered by criterion 1.4.3 above.
55.5%
of pages affected
Missing Alt Text on Images
Screen readers cannot describe images without alt attributes. Every meaningful image needs descriptive text; decorative images need empty alt tags. Covered by criterion 1.1.1.
48.2%
of pages affected
Missing Form Labels
Form fields without associated labels leave screen reader users guessing about what each field is for. Every input needs a programmatic or visible label. Covered by criterion 3.3.2.
45.4%
of pages affected
Empty or Vague Links
Links that say "click here" or have no text at all are meaningless to assistive tech. Every link must describe where it goes. Covered by criterion 2.4.4.
29.6%
of pages affected
Empty Buttons
Icon-only buttons (search, close, menu) without an accessible name are announced as "button" with no purpose. Covered by criterion 4.1.2.
15.8%
of pages affected
Missing Document Language
Without a lang attribute on the HTML tag, screen readers cannot determine correct pronunciation or language rules. Covered by criterion 3.1.1.
The bottom line: ~68% of WCAG 2.1 Level AA criteria are addressed through the auto-fix engine on Essential and Professional plans. The remaining ~32% — the criteria that require human judgment about your specific content — are covered on Enterprise plans through expert developer review. No other automated tool can honestly claim higher coverage; anyone who does is overselling.