Web checklist

Checkpoint 4.2b: Accessibility-Supported Technologies Only

Use accessibility-supported technologies. Any information or functionality that is implemented in technologies that are not accessibility supported must also be available via technologies that are accessibility supported. (4.1.3)


Technology features can be relied upon to conform to WCAG 2.0 success criteria only if they are used in a way that is accessibility supported.

Technology is accessibility supported when assistive technologies work with the technology and when the accessibility features of mainstream technologies work with the technology. Using a technology in a way that is accessibility supported means that it works with assistive technologies (AT) and the accessibility features of operating systems, browsers and other user agents.

In example, if a video is accessibility supported on a web page or in an application, a number of things are in place. It is briefly labelled in text so a user knows what the video is (e.g., "Excerpt from the movie Bambi"). The media player or the operating system offers the ability to display captions and provide audio descriptions. All the controls for operating the media player are keyboard accessible, and assistive technologies such as screen readers properly announce and interact with those controls.

To fully understand what it means for a technology to be accessibility supported, please carefully review the Understanding Accessibility Support section of the Understanding Conformance document of WCAG 2.0.

Required development and unit test techniques

To comply with this checkpoint, you must meet all of the following techniques.

  1. Only accessibility supported (link resides outside of ibm.com) ways of using technologies are relied upon to satisfy the checkpoints in this checklist (e.g., the Dojo Dijit widgets).
  2. Any information or functionality that is provided in a way that is not accessibility supported is also available in a way that is accessibility supported.

copyright 2011, 2013 IBM Corporation

Last updated February 1, 2011.

W3C Recommendation 11 December 2008: http://www.w3.org/TR/WCAG20/ (link resides outside of ibm.com)
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