input: [EITAS] 1194.21(d) [Category] Software Applications and Operating Systems [Section 508 Rule] Sufficient information about a user interface element including the identity, operation and state of the element shall be available to assistive technology. When an image represents a program element, the information conveyed by the image must also be available in text. [Supporting Features] Partially Supports. Some information about user interface elements may not be available to assistive technology. Text equivalents for some program element images may not exist. [Summary of Supported] Partially Supports [Exceptions and Remarks] 
output: Customized textbook list inaccessible to screenreaders. The change in button text when adding items to the cart, doesn't get passed to a screenreader.