What is on a website accessibility checklist? A website accessibility checklist lists every technical and design element that must be verified so that people using assistive technologies can perceive, understand, navigate, and interact with your site. It covers WCAG conformance levels, image and media handling, keyboard operability, form labeling, semantic markup, testing methods, legal context, and the SEO benefits of an accessible site.
What Is WCAG and Which Conformance Level Should You Target?
The Web Content Accessibility Guidelines (WCAG) are published by the W3C and serve as the global benchmark for digital accessibility. They are organized into three conformance levels:
| Level | What It Means | Typical Business Target |
|---|---|---|
| A | The most basic web accessibility features. | Rarely sufficient on its own for legal compliance. |
| AA | Addresses the most common barriers for users with disabilities. | The standard most laws and policies reference; the practical goal for most commercial sites. |
| AAA | The highest standard, covering all known barriers. | Often impractical for large, dynamic sites; pursued only for niche audiences. |
Why aim for AA? WCAG 2.2 AA satisfies the majority of legal requirements (e.g., U.S. ADA claims and the European Accessibility Act) while remaining achievable for development teams. It balances user experience, risk mitigation, and resource investment.
Which Image, Media, and Color Practices Belong on a Website Accessibility Checklist?
1. Alt Text for Images
- Informative images – Write concise, descriptive alt text that conveys the same information a sighted user would get.
- Decorative images – Use an empty
alt=""attribute so screen readers skip them. - Complex graphics – Provide a longer description in the surrounding text or a linked detailed description.
2. Captions, Transcripts, and Audio Descriptions
- Videos – Include synchronized captions for spoken dialogue and on-screen text.
- Audio‑only content – Offer a full transcript.
- Visual information not described in captions – Add audio descriptions to convey essential visual cues.
3. Color Contrast and Use
- Contrast ratios – Aim for at least 4.5:1 for normal text and 3:1 for large text (WCAG 2.2 AA).
- No meaning by color alone – Pair color cues with icons, patterns, or text labels (e.g., error messages).
- Testing tools – Use browser extensions or built‑in dev tools to verify contrast on each page element.
How Do Keyboard, Focus, and Motion Requirements Fit Into an Accessibility Checklist?
1. Full Keyboard Operability
- Ensure every interactive component (links, buttons, menus, form fields, modal dialogs) can be reached and activated using Tab, Enter, Space, and arrow keys.
- Eliminate keyboard traps where focus cannot move away from a component.
2. Visible Focus Indicator
- Provide a clear, high‑contrast outline or background change when an element receives focus.
- Avoid removing the default outline without replacing it with an equally perceivable style.
3. Skip Links and Navigation Aids
- Place a skip link at the top of the page that jumps straight to the main content (
#main). - Use landmark roles (
<nav>,<main>,<footer>) so screen‑reader users can jump to sections quickly.
4. Motion and Animation Controls
- Offer a mechanism (e.g., a “Pause/Stop” button) to halt moving, flashing, or auto‑advancing content.
- Respect the prefers-reduced-motion media query to automatically reduce motion for users who have set this preference.
5. Touch Targets for Mobile
- Ensure tap targets are at least 44 × 44 dp and have sufficient spacing.
- For guidance on tap targets and readable text, see our mobile‑friendly checklist.
What Language, Form, and Error‑Handling Items Must Be Checked?
1. Page Language Declaration
- Add a
lang="en"(or appropriate code) attribute to the<html>element. - For multilingual pages, use
langon each language‑specific section.
2. Form Labels and Associations
- Every input, select, and textarea must have a
<label>element linked viafor/idor by wrapping the control. - Group related fields with
<fieldset>and<legend>for context.
3. Clear Error Messages
- When validation fails, display error text that is programmatically associated with the offending field (
aria-describedby). - Provide concise, actionable instructions (e.g., “Enter a valid email address”).
4. Consistent Navigation
- Keep navigation structures (menus, breadcrumbs) uniform across pages to reduce cognitive load.
Why Should Semantic HTML and ARIA Be Part of the Checklist?
1. Prefer Native HTML Elements
- Use
<button>for clickable actions,<nav>for navigation blocks, and<header>/<footer>for page regions. Native elements carry built‑in accessibility semantics that assistive technologies recognize automatically.
2. Proper Heading Structure and Landmarks
- Follow a logical heading order (
<h1>→<h2>→ …) without skipping levels. - Apply ARIA landmark roles (
role="main",role="complementary") only when native landmarks are insufficient.
3. ARIA as a Supplemental Tool
- Add ARIA attributes (e.g.,
aria-label,aria-expanded) only when HTML cannot express the required meaning. - Test ARIA usage with screen readers to confirm it does not create confusion.
How Do I Test My Website for Accessibility?
1. Automated Scanning Tools
| Tool | What It Detects | Limitations |
|---|---|---|
| Lighthouse (Chrome DevTools) | Color contrast, missing alt text, form labeling, ARIA misuse | Misses context‑dependent issues and keyboard navigation problems |
| axe DevTools (browser extension) | Similar to Lighthouse plus some contrast and ARIA checks | Still limited to code‑level findings |
| WAVE (web accessibility evaluation tool) | Visual overlay of errors, contrast, missing labels | Does not assess dynamic interactions or focus order |
Tip: Run each tool on a representative sample of pages (home, product, contact, blog) to catch page‑specific problems.
2. Manual Keyboard Test
- Navigate the entire site using Tab, Shift + Tab, Enter, and arrow keys.
- Verify that focus moves in a logical order and that no element traps focus.
- Check that all interactive controls can be activated without a mouse.
3. Screen‑Reader Walkthrough
- NVDA (Windows) or VoiceOver (macOS/iOS): Open a page, enable the screen reader, and explore headings, landmarks, form fields, and dynamic content.
- Listen for missing or duplicate labels, unclear announcements, and proper reading order.
4. User Testing (Optional but Valuable)
- Invite users with disabilities to perform common tasks on your site. Their feedback often reveals issues that tools cannot detect.
Can an Accessibility Overlay Make My Site Compliant?
Accessibility overlays inject scripts that attempt to “fix” problems on the client side (e.g., adding alt text or contrast adjustments). While they may improve the visual experience for some users, they do not modify the underlying HTML, CSS, or JavaScript that defines the site’s accessibility.
Risks of relying on an overlay:
- False sense of compliance – Legal assessments focus on the source code, not on what a script adds at runtime.
- New barriers – Overlays can introduce keyboard traps, duplicate content, or interfere with screen readers.
- Limited longevity – Future browser updates or site redesigns may break the overlay’s functionality.
The most reliable path is to fix the code directly using the checklist items above. Overlays, if used at all, should be considered a temporary aid while you implement permanent fixes.
How Do Accessibility Requirements, the Law, and SEO Intersect?
Legal Landscape (Non‑Legal Advice)
- United States – Courts have applied the Americans with Disabilities Act (ADA) to websites, often referencing WCAG 2.1/2.2 AA as the benchmark.
- European Union – The European Accessibility Act requires public‑sector and many private digital services to meet WCAG AA.
Because regulations differ by jurisdiction, treat this article as guidance rather than legal counsel. Consult a qualified attorney for specific compliance questions.
SEO Benefits of an Accessible Site
Many checklist items double as SEO best practices:
| Accessibility Feature | SEO Impact |
|---|---|
| Descriptive alt text | Improves image search indexing and provides context for crawlers. |
| Structured headings | Helps search engines understand page hierarchy and relevance. |
| Clear link text | Increases crawlability and reduces bounce rates. |
| Fast, keyboard‑friendly navigation | Improves user engagement metrics that influence rankings. |
For a deeper dive into the SEO overlap, read our SEO checklist.
Next Steps
If you’ve identified code changes needed to meet this website accessibility checklist, we can help. Schedule a free consultation to review your site, prioritize fixes, and plan implementation.
Contact us today to get started.