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This guide is for federal agencies, procurement teams, accessibility program managers, testers, and development teams. The U.S. Access Board publishes the standards; Section508.gov provides implementation guidance and tools.
What Section 508 compliance means
Section 508 is a U.S. federal requirement concerning access to covered ICT. The Revised 508 Standards set technical requirements for that technology. Section508.gov states that the standards incorporate WCAG 2.0 Level A and AA Success Criteria for web content, but Section 508 is not simply a WCAG checklist: the applicable provisions depend on the ICT type and its use. For legal and standards questions, consult the Access Board’s Revised 508 Standards and your agency’s Section 508 program.
Federal ICT testing can involve commercial products, open-source software, custom-built systems, and vendor-supplied products. The relevant requirements and process may also depend on agency policy, procurement rules, and contract terms. Guidance for federal agencies does not, by itself, determine accessibility obligations for state, local, or private-sector organizations.
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How to plan a Section 508 test
Start by agreeing on the system boundary and the evidence the agency needs. Scope choices determine what a test can establish; a few sampled pages cannot support a claim about untested workflows or product versions.
- Identify the ICT and version. Record the product, build or release, relevant configuration, and whether the evaluation concerns a website, application, document, hardware, or another ICT type.
- Define the scope. List critical tasks, pages or modules, content types, and components. Record exclusions and why they are excluded. Include representative interactions, not just static screens.
- Set the test environment. Specify operating systems, browsers and versions, assistive technology considerations, and any other conditions needed to reproduce the evaluation. Choose environments in line with agency policy and the product’s intended use.
- Choose evaluation depth. Decide whether the work is an automated check, targeted spot check, component evaluation, or comprehensive assessment. State the scope and limits in the report.
- Align with procurement and program requirements. Check the solicitation, contract, and agency Section 508 process for required methods, evidence, demonstrations, and acceptance documentation.
How to test for Section 508 compliance
A reliable evaluation combines tools with human judgment. Automated tools can quickly flag some detectable issues and help repeat checks, but they do not cover every standard requirement. Context, interaction, and the way content works can require manual inspection. Federal guidance describes automated testing as a supplement to accessibility validation, not a complete conformance decision.
1. Run automated checks as an initial pass
Use automated checks to find issues the selected tools can detect and to make recurring checks more consistent. Treat each result as a lead to verify: tools can miss defects, and a flagged condition may need context before it can be classified. Do not describe a clean scan as proof that a site or product conforms.
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2. Inspect manually against a repeatable method
For web content, agencies can consider the DHS Trusted Tester approach, a standardized manual inspection method. If another process is used, federal procurement guidance says its methods and toolset should align with the ICT Testing Baseline. The Baseline helps build a test process or check one for completeness; it is not itself a testing process and does not include testing tools.
For each applicable requirement, examine the relevant content or interaction, record the outcome, and make sure another tester can reproduce a failure. Apply the requirements relevant to the ICT being evaluated rather than assuming every product is assessed with the same web-content checklist.
3. Test through development and after updates
Build accessibility validation into planning, requirements, design, development, testing, deployment, and operations, following agency policy. Reusable templates and components can be evaluated systematically, but changed or newly added instances still need suitable validation. Retest modified content and updated product versions; an earlier report describes only the version and scope it actually evaluated.
4. Add user experience evidence without confusing it with conformance testing
Feedback from people with disabilities and use of assistive technologies can reveal usability problems and provide valuable evidence. However, an assistive-technology walkthrough alone does not establish code conformance and should not be the only test method.
Tools that support the evaluation
Tools assist particular tasks; none should be treated as a universal certification of a whole site or product.
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- ANDI (Accessible Name & Description Inspector): Section508.gov lists this free, open-source bookmarklet, developed by the Social Security Administration, for use in the Trusted Tester process and ICT Testing Baseline tests. The same page says listed tools were selected with ease of use, ease of teaching, and accuracy in mind, and are free to install and use.
- Browser developer tools and contrast analyzers: These can support specific checks. Record what was checked and verify findings in the actual page or interaction.
- Accessibility Requirements Tool (ART): Helps users determine requirements for technology an agency buys or builds. It supports requirements work rather than serving as a hands-on conformance test.
- ACR Editor: Helps accessibility subject matter experts create machine-readable OpenACR reports. It is a documentation workflow tool, not a substitute for evaluating the product.
How to assess a vendor accessibility claim
An Accessibility Conformance Report (ACR), often prepared with an ITIC VPAT template, is a structured statement of a vendor’s accessibility support. It can help buyers identify questions, but it is evidence to review—not independent confirmation that the product conforms. Section508.gov guidance calls for comprehensive testing to validate claims.
Check the product and version covered, report date, scope, evaluation method, and explanations behind the claims. Contract terms and agency policy determine what evidence or acceptance process is required; an agency may reserve independent testing. An ACR’s product-level overview is not the same as a detailed developer-oriented test report.
What a Section 508 test report should include
A useful report lets a reader understand what was evaluated, what the results mean, and how to reproduce and fix problems. Include:
- Product details: name, version, and description.
- People and dates: tester name and organization, contact details, credentials where applicable, report date, evaluation date, and report version.
- Method and environment: evaluation method, operating system, browser and version, and other setup details necessary to reproduce results.
- Scope: pages, modules, or functions evaluated, plus omissions and exclusions.
- Requirement-level outcomes: a result for each applicable Section 508 provision and relevant WCAG success criterion; mark items not applicable explicitly and explain why.
- Defect records: what the issue is, where it occurs, severity, reproduction steps, and, where useful, a screenshot or code snippet. Add actionable remediation detail and track correction through verification.
Section508.gov identifies DHS’s Section 508 Compliance Reporting Tool and agency templates as possible report formats. The right format depends on the agency process and the purpose of the evaluation.
Screenshot evidence: capture the page, then document the finding
A screenshot can help show the location and visible state of a reported defect, but it does not establish accessibility conformance on its own. For a repeatable capture of a web page or a specific state, a screenshot API can preserve visual evidence alongside the test report. ScreenshotNeo is a website screenshot API and MCP server; it accepts a URL and returns an image or PDF, and its cookie-banner, popup, and chat-widget cleanup can be switched off when those elements are themselves the subject of the test. Use it as evidence capture, not as an accessibility testing or certification tool.
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Common testing mistakes and how to avoid them
- Relying on a scan alone: A scan covers only issues its checks can detect. Add systematic manual inspection for context-dependent requirements.
- Treating WCAG as the entire standard: WCAG 2.0 Level A and AA criteria are incorporated for web content, but other applicable provisions depend on ICT type. Consult the standards and agency process.
- Using a vendor ACR as the final verdict: Review its version, scope, date, method, and explanations, then validate claims with testing appropriate to agency policy and contract terms.
- Reporting an issue without reproduction detail: State the location, steps, environment, and impact so another person can confirm it and developers can address it.
- Reusing stale results after a release: Reports apply to the evaluated version and scope. Retest changes and updates.
- Treating the ICT Testing Baseline as a tool or ready-made test process: Use it to create or assess a process for completeness; select and carry out suitable testing methods separately.
- Using assistive technology as the only method: User experience evidence is valuable, but does not by itself establish code conformance.
How to choose a testing approach
There is no single test depth or tool that fits every ICT product. Compare approaches against the work the agency needs to complete:
| Approach | Useful for | What it cannot establish alone | Best fit |
|---|---|---|---|
| Automated checks | Quick, repeatable checks of detectable issues and recurring validation. | Complete coverage of the Revised 508 Standards or context-dependent conformance. | Use as one part of a broader evaluation. |
| Manual inspection using a repeatable protocol | Systematic review of requirements needing context or interaction judgment; web teams can consider DHS Trusted Tester. | Results beyond the defined product, version, scope, and environment. | Use where the agency needs documented, reproducible evaluation. |
| Hybrid evaluation | Combines tool-assisted checks with manual review and documented findings. | Conformance for untested pages, functions, versions, or applicable requirements. | Use when the evaluation needs both repeatability and human judgment. |
| User testing with people with disabilities or assistive technology | Usability insight and evidence about real interactions. | Code conformance when used as the sole method. | Add to, rather than substitute for, standards-based evaluation. |
Skill, time, product type, reproducibility, and agency procurement requirements all affect the choice. Agree on the method and scope before testing, then report the limits clearly.
Frequently Asked Questions
Does a Section 508-compliant website need to meet WCAG 2.0?
Section508.gov says the Revised 508 Standards incorporate WCAG 2.0 Level A and AA Success Criteria for web content. Consult the Access Board standards and agency program to determine all requirements applicable to the specific ICT.
Can a VPAT prove that a product is Section 508 compliant?
No. A VPAT-based ACR states a vendor’s accessibility claims and is useful evidence for review, but those claims need validation through appropriate testing.
Who publishes the Revised 508 Standards?
The U.S. Access Board publishes the standards; Section508.gov provides federal implementation guidance and tools.
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