WCAG vs Section 508: Key Differences Explained

WCAG vs Section 508 is a common question for designers, procurement teams and accessibility leads. This article explains what each is, how they differ, how they overlap and which one your organisation should follow.

What WCAG is

WCAG stands for Web Content Accessibility Guidelines. The W3C maintains WCAG as a technical specification that describes how to make web content accessible to people with disabilities.

Versions and conformance levels

• WCAG 2.0 published in 2008, WCAG 2.1 in 2018 and WCAG 2.2 in 2023.
• Success criteria are grouped into three levels: A, AA and AAA. Level AA is the most common target for legal and procurement requirements.

What Section 508 is

Section 508 is a U.S. federal accessibility requirement within the Rehabilitation Act that applies to federal agencies and to the electronic and information technology they procure or operate.

The 2017 refresh

The Section 508 refresh aligned the technical web requirements with WCAG success criteria. Practically, that means Section 508 references WCAG success criteria as the technical benchmark for web content.

Key differences: WCAG vs Section 508

Below is a concise comparison so you can see the main distinctions at a glance.

Aspect	WCAG	Section 508
Type	Technical guidance and standard from W3C.	U.S. federal accessibility requirement in law/regulation.
Scope	Web content and, via extensions, some non-web digital content and user agents.	Electronic and information technology used or procured by federal agencies.
Technical basis	Success criteria, testable outcomes and techniques in WCAG documents.	References WCAG success criteria for web content plus additional procurement language and exceptions.
Legal force	No direct legal force by itself; widely adopted by laws and policies worldwide.	Has legal force for covered U.S. federal entities and their ICT procurement.
Conformance target	Any level A, AA or AAA. Most public bodies use AA.	Uses WCAG success criteria as the technical baseline; agencies usually target WCAG 2.0 Level A and AA criteria referenced in the refresh.
Enforcement and remedies	Enforced indirectly when adopted into law or policy by governments, regulators or courts.	Enforced through federal administrative processes, agency oversight and procurement remedies for covered parties.

How WCAG and Section 508 relate in practice

Section 508 uses WCAG success criteria as its technical test for web content. That means following WCAG is the primary practical route to meeting Section 508 web requirements. However, Section 508 adds legal scope and procurement rules that WCAG alone does not cover.

Common implementation actions

• Adopt a WCAG conformance level as your technical target, usually AA.
• For U.S. federal procurement, include Section 508 clauses and request evidence such as a VPAT.
• Combine automated testing, manual review and testing with people with disabilities.

Decision guide: which should your organisation follow?

Use this short checklist to choose.

• If you are a U.S. federal agency, or supplying ICT to one, Section 508 applies and you must meet the technical WCAG requirements it references.
• If you are outside the U.S. or a private organisation, WCAG is the accepted global technical standard and a sensible legal baseline for public-facing content.
• If procurement involves international customers, check regional laws such as EN 301 549 in the EU in addition to WCAG.

Practical checklist to comply

Follow these steps to move from planning to measurable compliance.

1. Decide the target WCAG level, usually AA.
2. Add accessibility criteria to procurement documents and contracts. Request a VPAT from vendors to document conformance.
3. Run automated scans, but do not rely on them alone.
4. Conduct manual testing for keyboard navigation, focus order and semantic markup.
5. Test with real users with disabilities or credible proxies and record the results.
6. Maintain an accessibility statement and remediation plan with timelines.

Common mistakes to avoid

• Relying only on automated tools. They typically catch 20 to 40 percent of issues but miss many real-world barriers.
• Confusing WCAG as a law. WCAG is a technical standard; legal requirements arise when governments adopt it.
• Thinking a single audit is enough. Accessibility is ongoing and must be built into development cycles.
• Failing to request formal documentation such as a current VPAT when buying digital products for a federal contract.

Testing and evidence

Combine three methods for robust coverage.

• Automated testing for broad sweeps of common markup and ARIA issues.
• Manual inspection to check semantics, labels, headings and keyboard behaviour.
• User testing to reveal real accessibility gaps and usability problems.

Keep records: test plans, defect lists, user test reports and a VPAT where relevant. Those form the documented evidence of compliance for Section 508 and for many procurement processes.

Final note

WCAG and Section 508 are complementary. WCAG supplies the technical success criteria. Section 508 supplies legal scope for U.S. federal ICT. For most organisations, adopt WCAG AA as the technical baseline, add the legal and procurement steps needed for your jurisdiction, and test continuously.