Web Accessibility

Last modified on 2023/08/02 14:23

The World Wide Web Consortium (W3C) has created recommendations through the Web Accessibility Initiative (WAI).

Among these recommendations, there are those relating to web content, called the Web Content Accessibility Guidelines (WCAG).

  • These rules make Web content more accessible to people with disabilities, including blind and partially sighted people, deaf and hard of hearing people, people with learning disabilities, cognitive limitations, motor limitations, speech limitations, photosensitivity and people with a combination of these functional limitations.
  • They also make Web content more usable by older individuals with changing abilities due to aging and often improve usability for users in general.

There are also specific guidelines or laws that derive from this set of recommendations.

  • WCAG (Web Content Accessibility Guidelines). Open url.png See the Details.
  • EN 301 549 in Europe. Open url.png See the Details.
  • Section 508 in the USA. Open url.png See the Details.


The guidelines and success criteria are built around four principles, which provide the foundation for anyone who wants to access and use web content.


Information and user interface components must be presentable to users in ways they can perceive.


User interface components and navigation must be operable.


Information and the operation of user interface must be understandable.


Content must be robust enough that it can be interpreted reliably by a wide variety of user agents, including assistive technologies.

If any of these principles are not respected, users with disabilities will not be able to use the web properly.

Conformance requirements

Testable success criteria are provided for each rule to allow the use of WCAG where requirements and conformance testing are required, including design specification, purchase, regulation and contractual agreements.

To meet the needs of different groups and contexts, three levels of compliance have been defined:

  • Level A: minimum level of accessibility.
  • Level AA: improved level of level A.
  • Level AAA: level higher than level AA.


Web Content Accessibility Guidelines (WCAG) 2.0

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