I’ve received a number of questions and seen a number of forum postings lately regarding accessibility and dynamic forms created by Designer or rendered through the Forms module. Dynamic forms ARE accessible, but this is accomplished in a slight different way than static PDF forms and requires a different approach.
Dynamic forms render directly to the screen because they get updated and redrawn on a regular basis. This bypasses the regular tagged structure that static forms or other PDF documents produce. This approach provides better performance for dynamic forms because it avoids generating the whole structure every time the layout of the dynamic form changes. Dynamic forms will work with Jaws because they communicate through the MSAA (MicroSoft Active Accessibility) interface to tell it what text to speak. The Read Out Loud capability in Acrobat and Reader relies on the structure of the PDF and therefore can not read dynamic forms. Saving the form as Static PDF from Designer produces the structure that Read Out Loud is expecting. The accessibility checking function in Acrobat is also expecting the tagged structure and does not check the accessibility of dynamic forms. Dynamic forms should be accessibility tested with a screen reader such as Jaws for the best result.