What is Accessibility Testing?

About 16% of the world population live with some form of disability—yet many digital products still fail basic accessibility checks.

Accessibility testing ensures websites and apps work for users with visual, hearing, motor, or cognitive impairments while meeting standards like WCAG to maintain usability, inclusivity, and legal compliance. Fixing accessibility issues late in development is expensive and time-consuming, making accessibility testing essential from the start.

In this guide I will explain what accessibility is, its types, standards to follow and practical workflows to follow.

Why Should Companies Focus on Accessibility Testing?

These statistics given below reflect why companies must prioritize accessibility testing:

1. Huge underserved market

This group controls roughly $1.9 trillion in annual disposable income, which companies will lose if digital services are inaccessible.

2. Lost revenue from inaccessible experiences

Designing and testing for accessibility directly recovers this untapped potential.

3. Legal and compliance risk

Laws and regulations such as the Americans with Disabilities Act (ADA), Section 508 (U.S.), the European Accessibility Act (EAA), and others mandate digital accessibility. Failing to comply can result in lawsuits, fines, and reputational damage.

4. Better SEO and technical quality

Sites with strong accessibility practices would have cleaner semantic HTML which lead to higher organic search rankings, more traffic, and better engagement, because accessibility guidelines align closely with core SEO best practices.

5. Lower development and maintenance costs

Catching issues early (color‑contrast problems, missing labels, keyboard traps) reduces rework, production bugs, and technical debt, improving overall release velocity.

6. Inclusive UX benefits everyone

Accessibility improvements also help users with temporary or situational impairments (e.g., bright‑sunlight use, low‑bandwidth, noisy environments).

This “universal design” effect broadens usability across the entire customer base, not just users with disabilities, and improves overall satisfaction and retention.

How to Perform Accessibility Testing?

This section shows how to perform accessibility testing in real time using automation, keyboard checks, screen readers, WCAG validation, and real environment testing.

1. Set Up Your Testing Environment

Start with a setup that supports both automated and manual accessibility testing.

Tools Recommended:

• Playwright, Selenium, or Cypress for browser automation
• Any automated accessibility testing tool or library that integrates with your framework
• NVDA (Windows) or VoiceOver (macOS) for screen reader testing
• Real devices for cross-environment validation. Alternatively, you can use cloud testing tools to run on real devices and browsers without worrying about set up or maintenance.

Basic setup example (Playwright):

In this code example, I’m using Playwright. You can use any other testing framework as per your requirement:

npm init -y

npm install -D @playwright/test

npx playwright install

What matters in setup:

• Your accessibility tool should detect issues like missing alt text, contrast problems, and incorrect semantics
• It should integrate with your test framework for automation
• It should support reporting and debugging for faster fixes

2. Run a Full Page Accessibility Scan

Accessibility tests can run as standalone tests or be integrated into existing functional tests.

Example (generic structure):

import { test, expect } from '@playwright/test';

test('should not have accessibility issues on homepage', async ({ page }) => {

  await page.goto('https://your-site.com/');

  const results = await runAccessibilityScan(page);

  expect(results.violations).toEqual([]);

});

What this does:

• Opens the page under test
• Runs an automated accessibility scan
• Fails the test if violations are found

3. Scan a Specific Part of a Page

Use this when testing components like menus, modals, forms, or dynamic sections.

Example (generic structure):

test('navigation menu should be accessible', async ({ page }) => {

  await page.goto('https://your-site.com/');

  await page.getByRole('button', { name: 'Navigation Menu' }).click();

  await page.locator('#navigation-menu').waitFor();

  const results = await runAccessibilityScan(page, {

    include: ['#navigation-menu']

  });

  expect(results.violations).toEqual([]);

});

Why this matters:

• Accessibility scans should run only after the UI is in the correct state
• Hidden or unloaded elements will not be tested
• Helps focus on high-risk UI components

4. Validate Against WCAG A and AA Standards

Run targeted scans aligned with WCAG guidelines when compliance is required.

Example:

test('should meet WCAG A/AA requirements', async ({ page }) => {

  await page.goto('https://your-site.com/');

  const results = await runAccessibilityScan(page, {

    standards: ['wcag-a', 'wcag-aa']

  });

  expect(results.violations).toEqual([]);

});

Why this matters:

• Helps validate compliance against internationally recognized accessibility standards
• Reduces legal and compliance risks
• Identifies issues affecting keyboard users, screen readers, and low-vision users
• Ensures accessibility requirements are consistently enforced during development

5. Test Keyboard Navigation

Automated scans do not fully validate whether users can actually operate the application with a keyboard.

How to test:

• Press Tab to move forward
  Press Shift + Tab to move backward
  Press Enter or Space to activate controls
  Press Esc to close dialogs, popups, and menus

What to validate:

• Every interactive element is reachable
• Focus is visible at all times
• Focus order follows the page layout
• Modals keep focus inside until closed
• Focus returns to the trigger after closing a modal

Why this matters:

• Many users rely entirely on keyboard navigation
• Broken focus order creates unusable workflows
• Missing focus indicators make navigation confusing
• Keyboard traps can prevent users from accessing or exiting components

6. Test with Screen Readers

Screen reader testing confirms whether the application is understandable to users who rely on assistive technology.

How to test:

• Use NVDA on Windows or VoiceOver on macOS
• Navigate using keyboard only
• Listen to how labels, buttons, links, forms, and alerts are announced

What to check:

• Buttons have meaningful names
• Links describe where they go
• Form fields announce their labels
• Error messages are clear
• Dynamic updates are announced correctly

Why this matters:

• Automated tools cannot fully verify screen reader experience
• Incorrect labels make interfaces unusable for blind users
• Poor announcements create confusion during form interactions
• Dynamic content may become invisible to assistive technologies without proper ARIA handling

7. Test Critical User Flows

Do not limit accessibility testing to static pages. Test the flows users depend on.

Flows to test:

• Login
• Signup
• Search
• Form submission
• Add to cart
• Checkout
• Payment
• Account settings

What to validate:

• Users can complete the flow without a mouse
• Errors are visible and announced
• Focus moves to the right place after each action
• No custom widget blocks keyboard or screen reader users

Why this matters:

• Accessibility issues often appear during multi-step workflows
• Users may abandon tasks if forms or modals become inaccessible
• Dynamic UI updates can break screen reader announcements
• Critical business flows must remain accessible for all users

8. Test on Real Devices and Browsers

Accessibility behavior varies by browser, operating system, device, and assistive technology combination.

Test across:

• Chrome, Safari, Firefox, Edge
• Windows, macOS, Android, iOS
• Desktop, tablet, and mobile screens
• Screen readers and OS-level accessibility settings

Read Device cloud platforms helps teams test accessibility across real devices and browsers, making it useful for validating issues that do not appear in local or simulated environments.

Why this matters:

• Accessibility behavior differs across browsers and operating systems
• Some issues only appear on real mobile devices
• Screen reader behavior varies significantly between platforms
• Real-device testing catches rendering, focus, and interaction bugs missed in simulators

9. Fix Common Issues with Code Examples

These fixes address frequent accessibility issues found during automated and manual testing.

Add proper labels to form fields

This fixes missing form context. Screen readers need labels to announce what each input field is for.

<label for="email">Email</label>

<input id="email" type="email">

Add accessible names to icon buttons

This fixes unclear actions. Icon-only buttons need readable names for assistive technologies.

<button aria-label="Close menu">×</button>

Keep focus visible

This fixes keyboard navigation visibility. Users must always know which element is active.

:focus {

  outline: 2px solid #005fcc;

}

Announce dynamic content

This fixes missing announcements for alerts, notifications, and status updates.

<div aria-live="polite">

  Item added to cart

</div>

10. Add Accessibility Tests to CI/CD

Run accessibility checks as part of your automated test pipeline so issues are caught before release

Example (GitHub Actions with Playwright):

name: Accessibility Tests

on: [push, pull_request]

jobs:

 accessibility:

   runs-on: ubuntu-latest

   steps:

     - uses: actions/checkout@v4

     - run: npm install

     - run: npx playwright install --with-deps

     - run: npx playwright test

What to configure in your tests:

• Run accessibility scans inside test cases
• Fail tests when violations are detected
• Optionally block builds only for critical WCAG issues

Where this fits in the pipeline:

• Run alongside functional tests
• Trigger on every PR and commit
• Execute before merge or deployment

How teams use results:

• Failures appear in CI logs
• Reports highlight affected pages/components
• Developers fix issues before merging code

Real-world considerations:

• Run full scans on critical pages, not entire site (to keep builds fast)
• Handle dynamic content carefully to avoid false positives
• Combine CI checks with periodic manual and assistive tech testing

How to Choose the Right Approach for Accessibility Testing?

Choosing the right accessibility testing approach depends on your goal, product type, and stage in the development lifecycle. Instead of relying on a single method, you need a structured, layered strategy that ensures both technical compliance and real-world usability.

Difference Between Manual and Automated Accessibility Testing

The table below highlights the use cases for automated and manual accessibility testing to help decide when to use each approach.

Understanding Digital Accessibility Testing Standards

The Web Content Accessibility Guidelines (WCAG) is a set of internationally recognized guidelines developed by the World Wide Web Consortium (W3C) to ensure digital content is accessible to people with disabilities.

4 WCAG Principles

The main goal of any accessibility compliance testing should be to determine if a web application is compatible with the 4 WCAG principles known as POUR:

Further, there are 3 conformance levels in WCAG:

Legal Acts Followed in Different Countries

Governments mandate companies to comply with accessibility guidelines as it is consistent with the principles of equal rights, legal obligations, social responsibility, and market considerations. The goal is to establish a more inclusive and equitable society worldwide, allowing everyone to participate fully.

Here are examples of accessibility compliance in different regions:

Types of Disabilities to Consider for Accessibility Testing & What to Validate?

Different users experience applications in different ways, so accessibility testing must account for a range of disabilities. Instead of treating accessibility as a single checklist, it helps to understand how each disability impacts interaction and what needs to be validated.

The table below maps common disability types to the specific areas you should test, making it easier to focus on what truly affects usability.

Accessibility Testing Metrics

Accessibility testing metrics are quantitative measures used to test website accessibility, evaluate the level of accessibility, track progress, identify improvement areas, and ensure compliance with accessibility standards.

Accessibility Testing Tools

This table compares top accessibility testing tools for development teams, covering licensing models, platforms, WCAG support, and more to aid quick evaluation.

Conclusion

Accessibility testing is a continuous, layered process that combines automated checks, manual validation, assistive technology testing, and real-device verification. Understanding the different types of accessibility testing and when to use each method ensures both compliance with standards like WCAG and a usable experience for real users.

The most effective approach is to integrate accessibility early in development, validate it across user journeys, and continuously monitor it as the application evolves.

Accessibility testing, when done right, improves usability, reduces risk, and ensures that applications work for everyone—not just a subset of users.

Venkatesh Raghunathan

Senior Lead - Customer Engineering

Venkatesh Raghunathan has spent 16+ years building full stack systems and working with customers to make them successful. He focuses on making sure systems are not only well built, but also reliable and useful in day-to-day operations.