The final rule applies WCAG 2.0 not only to web-based content but to all electronic content. This means that even the documents embedded on your website should be accessible and easy-to-access to all users including the people with disabilities.
Like the original 508 Standards, the updated 508 Standards apply to a federal agency’s full range of public-facing content, including websites, documents and media, blog posts, and social media sites. The final rule also specifically lists the types of non-public-facing content that must comply. This includes electronic content used by a federal agency for official business to communicate: emergency notifications, initial or final decisions adjudicating administrative claims or proceedings, internal or external program or policy announcements, notices of benefits, program eligibility, employment opportunities or personnel actions, formal acknowledgments or receipts, questionnaires or surveys, templates or forms, educational or training materials, and web-based intranets.