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“When pages utilize scripting languages to display content, or to create interface elements, the information provided by the script shall be identified with functional text that can be read by assistive technology.”

WCAG 1.0 Checkpoint: None

Explanation

In other words, browsers that are not Javascript enabled, implement Javascript poorly, or have Javascript turned off will not be able to get to the content provided by the script. Therefore, on pages that use scripting to create content or elements (e.g., DHTML), provide accessible text equivalents for the information provided by the scripts.

Reference

Core Techniques for Web Content Accessibility Guidelines 1.0: http://www.w3.org/TR/WCAG10-CORE-TECHS/#alt-pages