Although these guidelines cover a wide range of issues, they are not able to address the needs of people with all types, degrees, and combinations of disability.

An individual who has actual knowledge of a patent which the individual believes contains Essential Claim(s) must disclose the information in accordance with section 6 of the W3C Patent Policy. Web Content Accessibility Guidelines (WCAG) 2.0 defines how to make Web content more accessible to people with disabilities.

Accessibility involves a wide range of disabilities, including visual, auditory, physical, speech, cognitive, language, learning, and neurological disabilities.

This document was produced by a group operating under the 5 February 2004 W3C Patent Policy.

W3C maintains a public list of any patent disclosures made in connection with the deliverables of the group; that page also includes instructions for disclosing a patent.

WCAG 2.0 is developed through the W3C process in cooperation with individuals and organizations around the world, with a goal of providing a shared standard for Web content accessibility that meets the needs of individuals, organizations, and governments internationally.

WCAG 2.0 builds on WCAG 1.0 [WCAG10] and is designed to apply broadly to different Web technologies now and in the future, and to be testable with a combination of automated testing and human evaluation.

The W3C also recommends that Web accessibility policies reference WCAG 2.0.

This section describes the status of this document at the time of its publication. A list of current W3C publications and the latest revision of this technical report can be found in the W3C technical reports index at

Authoring tools also have an important role in Web accessibility.

For an overview of how these components of Web development and interaction work together, see: The individuals and organizations that use WCAG vary widely and include Web designers and developers, policy makers, purchasing agents, teachers, and students.

Please refer to the errata for this document, which may include normative corrections. This document is also available in non-normative formats, available from Alternate Versions of Web Content Accessibility Guidelines 2.0.