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WCAG & digital accessibility compliance: a plain-English guide
The technical standard behind every U.S. digital-accessibility obligation, what it requires, who it binds, and how enforcement actually works.
What WCAG is
The Web Content Accessibility Guidelines are the technical specification that U.S. accessibility law points to. The current legally referenced target is WCAG 2.1 Level AA, incorporated by the DOJ (Title II) and HHS (Section 504).
The four principles
WCAG is organized under four ideas — content must be Perceivable, Operable, Understandable, and Robust. Together they cover text alternatives, keyboard operation, readable structure, color contrast, and compatibility with assistive technologies.
WCAG 2.2 (October 2023)
Version 2.2 adds nine success criteria addressing cognitive load, mobile, and user control — focus not obscured, dragging-movement alternatives, a 24-by-24-pixel minimum target size, consistent help, accessible authentication, and redundant-entry avoidance. WCAG 2.1 AA remains the legal standard; 2.2 is best practice and the direction of travel.
Section 508 alignment
The Revised Section 508 Standards incorporate WCAG 2.0 Level AA and are mandatory for federal agencies and their vendors. ADA obligations reference WCAG as the practical benchmark.
Who must comply
- State & local government — ADA Title II (WCAG 2.1 AA; 2027–2028 deadlines).
- Public accommodations — ADA Title III, increasingly applied to websites.
- Federally funded organizations — Section 504 (obligation in force since July 2024).
- Federal agencies and vendors — Section 508.
Enforcement — the reality
Accuracy matters here, because the figures circulated online are often wrong:
- Private ADA Title III suits in federal court generally yield injunctive relief plus the plaintiff's attorney's fees — not money damages.
- DOJ enforcement can seek civil penalties (inflation-adjusted statutory maximums) in addition to injunctive relief.
- State laws may add statutory damages — California's Unruh Act allows roughly $4,000 per violation.
- No federal agency pre-certifies compliance. Documented WCAG conformance is the defense.
The most common accessibility failures
Automated testing of the top one million home pages finds the same handful of issues dominate:
| Failure | Prevalence | WCAG criterion |
|---|---|---|
| Low-contrast text | 83.9% | 1.4.3 Contrast (Minimum) |
| Missing alternative text for images | 53.1% | 1.1.1 Non-text Content |
| Missing form input labels | 51% | 3.3.2 Labels or Instructions |
| Empty links | 46.3% | 2.4.4 Link Purpose |
| Empty buttons | 30.6% | 4.1.2 Name, Role, Value |
| Missing document language | 13.5% | 3.1.1 Language of Page |
Assistive technologies
Conformance is ultimately about whether real tools work: screen readers (JAWS, NVDA, VoiceOver, TalkBack) and alternative input (switch devices, eye-tracking, voice control, sip-and-puff). Automated checks cannot confirm this — manual testing does.