Web accessibility means designing and developing websites, tools, and technologies so that people with disabilities can perceive, understand, navigate, and interact with the web. It covers visual, auditory, physical, speech, and cognitive disabilities, and is guided by international standards such as WCAG from the W3C.
Web Accessibility
Key facts about web accessibility
- Concept: Designing and developing digital content so people with disabilities can use it effectively
- Applies to: Websites, mobile applications, tools, and digital services
- Key standard: Web Content Accessibility Guidelines (WCAG), developed by the W3C Web Accessibility Initiative (WAI)
- Core framework: POUR: Perceivable, Operable, Understandable, Robust
- Legal relevance: Referenced by the ADA, Section 508, European Accessibility Act, and other laws
- Scope: Around 100 million people in the EU alone have some form of disability, making digital accessibility essential for equal access
What is web accessibility?
Web accessibility means that websites, tools, and technologies are designed and developed so that people with disabilities can perceive, understand, navigate, and interact with them.
Accessibility covers a broad range of conditions, including visual, auditory, physical, speech, cognitive, and neurological disabilities. It also benefits people without disabilities, such as those using mobile devices, those in low-bandwidth environments, or those experiencing age-related changes.
The international standard for web accessibility is the Web Content Accessibility Guidelines (WCAG), published by the W3C. WCAG 2.2 is the current version and is now also an ISO standard.
Web accessibility standards and guidelines
The primary framework for web accessibility is WCAG, which is built on four principles known as POUR:
Principle | What it means |
|---|---|
Perceivable | Content must be presented in ways users can perceive, such as text alternatives for images |
Operable | Interfaces must be navigable by keyboard and other assistive tools |
Understandable | Content and navigation must be clear and predictable |
Robust | Content must work across different browsers, devices, and assistive technologies |
WCAG defines three conformance levels: A (minimum), AA (standard, required by most laws), and AAA (highest). Most accessibility regulations require Level AA compliance.
For an overview of the upcoming major revision, see our WCAG 3.0 glossary page.
Common web accessibility features
Accessible websites typically implement the following:
- Alt text: Text descriptions for images that allow screen readers to convey visual content to users who are blind or have low vision
- Keyboard navigation: Full site functionality available without a mouse, essential for users with motor disabilities
- Color contrast: Sufficient contrast between text and background for readability by users with low vision or color blindness
- Captions and transcripts: Text alternatives for audio and video content, supporting users who are deaf or hard of hearing
- Semantic structure: Proper use of headings, labels, and landmarks to help users navigate with assistive technologies
Web accessibility testing and audits
Organizations use a combination of automated tools and manual review to evaluate web accessibility:
- Automated tools such as the WAVE Web Accessibility Evaluation Tool can identify common issues, such as missing alt text or low contrast
- Manual testing is required to assess context-dependent issues that automated tools cannot detect
- Assistive technology testing involves evaluating the site using screen readers and keyboard-only navigation
For organizations that need structured support, accessibility testing and audits provide a systematic review against WCAG criteria.
Web accessibility and legal compliance
Web accessibility is required by law in many jurisdictions. Key regulations include:
- ADA (Americans with Disabilities Act): Requires digital content to be accessible to individuals with disabilities in the United States. See our ADA glossary page for more details.
- Section 508: Applies to federal agencies and their contractors in the US
- European Accessibility Act (EAA): Requires accessible digital products and services across EU member states from June 2025
Non-compliance can result in legal action, regulatory complaints, and reputational risk.
Web accessibility solutions
Organizations implement web accessibility as part of broader compliance and inclusion strategies. Dedicated platforms can help organizations:
- Support users with disabilities through an accessibility widget
- Manage and track accessibility issue reporting
- Publish a compliant accessibility statement
- Conduct structured accessibility testing and audits
For more information on how Clym supports web accessibility compliance, see our accessibility solutions.
Related compliance terms
Commonly asked questions
Web accessibility means designing and developing websites and digital tools so that people with disabilities can perceive, understand, navigate, and interact with them effectively.
The primary standard is WCAG (Web Content Accessibility Guidelines), developed by the W3C. WCAG 2.2 is the current version. Most laws require compliance with Level AA.
POUR stands for Perceivable, Operable, Understandable, and Robust. These are the four core principles that underpin the WCAG accessibility guidelines.
Automated tools such as WAVE can identify common issues. Manual testing and assistive technology testing are also needed to fully evaluate accessibility. A structured accessibility audit provides the most comprehensive assessment.
Yes, in many jurisdictions. In the US, the ADA and Section 508 require accessible digital content. In the EU, the European Accessibility Act requires compliance from June 2025.
Common features include alt text for images, keyboard navigation support, sufficient color contrast, captions for video content, and proper semantic heading structure.
Adam is the Head of Digital Marketing at Clym, where he leverages his diverse expertise in marketing to support businesses with their compliance needs and drive awareness about data privacy and web accessibility. As one of the company’s original team members, Adam has been instrumental in shaping its journey from the very beginning. When he’s not diving into marketing strategies, Adam can be found cheering on his favorite sports teams or enjoying fishing.
Find out more about Adam