WCAG and the ADA

The Web Content Accessibility Guidelines (WCAG) are a W3C technical specification — not a statute. The Americans with Disabilities Act (ADA) is a U.S. civil-rights law. The DOJ formally adopted WCAG 2.1 Level AA as the technical standard for ADA Title II (28 C.F.R. § 35.200, codified 2024). Federal courts have consistently applied WCAG 2.1 Level AA as the operative benchmark for ADA Title III cases since Robles v. Domino's Pizza (9th Cir. 2019).

How a W3C spec became U.S. law

The W3C published WCAG 1.0 in 1999. WCAG 2.0 followed in 2008. The ADA was enacted in 1990, before the modern web — and it does not name a specific technical standard for websites. For two decades, courts and the DOJ had to fill that gap.

  1. 2006 — NFB v. Target ($6M class settlement): Plaintiffs argued the ADA covers websites tied to physical stores. Settlement included WCAG conformance commitments.
  2. 2018 — Section 508 Refresh: U.S. Access Board harmonized federal accessibility procurement with WCAG 2.0 Level AA — first formal U.S. regulation to reference WCAG.
  3. 2019 — Robles v. Domino's (9th Cir.): Held Title III applies to websites of public accommodations. Supreme Court declined to review. Cemented WCAG 2.1 AA as the courts' benchmark.
  4. 2022 — DOJ web accessibility guidance: Reinforced that WCAG 2.1 AA is the standard the DOJ uses to evaluate Title III complaints.
  5. 2024 — DOJ Title II final rule: First formal federal regulation codifying WCAG 2.1 AA as the technical standard for state and local government websites (89 Fed. Reg. 31320; codified at 28 C.F.R. § 35.200).
  6. 2026 — DOJ Title II IFR: April 20, 2026 IFR extended compliance dates by one year but kept WCAG 2.1 AA as the standard.

WebAIM Million 2026 — Released March 2026

The Big Six: 96% of all accessibility errors

Six failure types account for 96% of all detected accessibility errors — for the seventh consecutive year. Fixing these in priority order will eliminate the vast majority of ADA exposure for most websites.

  1. #1. Low contrast text

    83.9% of pages

    Text or images of text that do not meet a 4.5:1 contrast ratio against their background (or 3:1 for large text 18pt regular / 14pt bold).

    WCAG: 1.4.3 Contrast (Minimum) (Level AA)

  2. #2. Missing alternative text

    53.1% of pages

    Images without an alt attribute, or with alt text that does not convey the image's purpose. Decorative images need empty alt="".

    WCAG: 1.1.1 Non-text Content (Level A)

  3. #3. Missing form input labels

    51% of pages

    Form inputs without a programmatically associated <label>, or relying on placeholder text as a substitute for a label.

    WCAG: 1.3.1 Info and Relationships · 3.3.2 Labels or Instructions · 4.1.2 Name, Role, Value (Level A)

  4. #4. Empty links

    46.3% of pages

    Anchor elements with no accessible text — often icon-only links missing aria-label, or anchors whose only content is an image without alt.

    WCAG: 2.4.4 Link Purpose (In Context) (Level A)

  5. #5. Empty buttons

    30.6% of pages

    Button elements with no accessible name — often icon buttons missing aria-label.

    WCAG: 4.1.2 Name, Role, Value (Level A)

  6. #6. Missing document language

    13.5% of pages

    The <html> tag is missing a lang attribute. Screen readers need this to choose the correct pronunciation engine.

    WCAG: 3.1.1 Language of Page (Level A)

Source: WebAIM Million 2026 (released late March 2026)

Which WCAG version does the ADA actually require?

Statute / RuleWCAG version
ADA Title II (DOJ 2024 final rule)WCAG 2.1 Level AA
ADA Title III (case law)WCAG 2.1 Level AA (de facto)
HHS Section 504 web/mobile ruleWCAG 2.1 Level AA
Section 508 of the Rehabilitation ActWCAG 2.0 Level AA
European Accessibility Act (via EN 301 549)WCAG 2.1 Level AA

See the 50 WCAG 2.1 AA success criteria →

FAQ

Is WCAG legally required?
Indirectly. WCAG itself is a voluntary W3C specification — not a U.S. statute or regulation. But the U.S. DOJ has formally adopted WCAG 2.1 Level AA as the technical standard for ADA Title II via the 2024 rule (28 C.F.R. § 35.200). For Title III, federal courts consistently apply WCAG 2.1 AA as the operative benchmark. So while WCAG is not itself law, conformance is required by law in most U.S. accessibility contexts.
What WCAG version does the ADA require?
For Title II (state and local government): WCAG 2.1 Level AA is codified by the DOJ's 2024 rule. For Title III (private business): courts apply WCAG 2.1 Level AA in case law. Section 508 references WCAG 2.0 AA. HHS Section 504 references WCAG 2.1 AA. The EU's EN 301 549 (incorporated into the European Accessibility Act) also incorporates WCAG 2.1 AA.
Does meeting WCAG mean I will not be sued?
WCAG conformance significantly reduces lawsuit risk but does not guarantee immunity. Plaintiffs evaluate real-world accessibility — keyboard usability, screen reader experience, checkout flows. Automated scans only catch 30-40% of barriers. Pair WCAG conformance with manual assistive-technology testing. About 95% of sued companies settle, suggesting most defendants choose to remediate rather than fight on the merits.