Accessibility testing

What is accessibility testing?

Accessibility testing is a specialized subset of software testing used to evaluate how easily people with disabilities can navigate, understand, and interact with a digital product. The goal of this testing is to identify barriers that might hinder users of assistive technologies, such as screen readers, voice recognition software, or switch devices. A comprehensive testing strategy typically combines automated scanning, manual expert review, and user testing to align with standards like WCAG 2.1 and 2.2.

Accessibility testing meaning

In the digital compliance lifecycle, accessibility testing is the diagnostic phase where a website, mobile app, or document is measured against specific success criteria. It is the prerequisite for accessibility remediation.

The primary focus areas of accessibility testing include:

• Perceivability: Testing if users can identify content using their available senses (e.g., alt-text for images, captions for video).
• Operability: Testing if the interface can be navigated via keyboard-only or voice commands.
• Understandability: Testing if the information and UI operation are clear and predictable.
• Robustness: Testing if the content remains functional across various browsers and assistive tools.

The three pillars of accessibility testing

To provide an accurate assessment, testing must be multi-layered. Relying on a single method often leads to "false positives" or missed barriers.

1. Automated testing

Automated tools use algorithms to scan code for objective errors. They are highly efficient for catching high-volume issues like:

• Missing image alt-text.
• Insufficient color contrast.
• Empty form labels.
• Broken links.

2. Manual expert testing

Because accessibility involves human perception, many WCAG criteria require subjective judgment. Expert testers manually navigate the site using only a keyboard and assistive technologies (like NVDA, JAWS, or VoiceOver) to identify:

• Logical tab order and focus traps.
• Meaningful sequence of content.
• Accuracy of ARIA labels.

3. User testing (Usability)

The most thorough form of testing involves individuals with lived experience of disabilities. This provides insights into the "functional" experience, identifying hurdles that automated or expert tests might overlook, such as complex workflows that are technically compliant but practically difficult to use.

Accessibility testing vs. standard QA testing

While standard Quality Assurance (QA) focuses on whether a feature "works" for the average user, accessibility testing focuses on whether it is "inclusive."

How software facilitates the testing lifecycle

Managing accessibility testing across thousands of pages can be complex. Accessibility testing software helps centralize this effort by providing ongoing monitoring and reporting.

Rather than a one-time "check," accessibility is a continuous process. Clym’s accessibility tools support this by offering automated scanning and remediation guidance. These tools allow teams to integrate testing into their regular development cycles, identifying potential barriers in real-time and documenting their efforts to maintain a more inclusive digital environment.