HTTP/2 301 server: GitHub.com content-type: text/html location: https://idpf.github.io/a11y-guidelines/ x-github-request-id: 12FF:3E9954:1A4CE:23B20:6969AEF4 accept-ranges: bytes age: 0 date: Fri, 16 Jan 2026 03:22:29 GMT via: 1.1 varnish x-served-by: cache-bom-vanm7210020-BOM x-cache: MISS x-cache-hits: 0 x-timer: S1768533749.478218,VS0,VE218 vary: Accept-Encoding x-fastly-request-id: 02e1e2920ed41aa45de0c0c2f4e0438821841497 content-length: 162 HTTP/2 200 server: GitHub.com content-type: text/html; charset=utf-8 last-modified: Wed, 09 May 2018 18:34:29 GMT access-control-allow-origin: * etag: W/"5af33f35-362a" expires: Fri, 16 Jan 2026 03:32:29 GMT cache-control: max-age=600 content-encoding: gzip x-proxy-cache: MISS x-github-request-id: D112:30601E:1A106:2377C:6969AEF4 accept-ranges: bytes age: 0 date: Fri, 16 Jan 2026 03:22:29 GMT via: 1.1 varnish x-served-by: cache-bom-vanm7210020-BOM x-cache: MISS x-cache-hits: 0 x-timer: S1768533750.709312,VS0,VE232 vary: Accept-Encoding x-fastly-request-id: b838b90c69daf9ee581c6f788db0aa051e144e84 content-length: 2964

EPUB 3 Accessibility Guidelines

This guide is a complement the EPUB Accessibility specification and techniques. It provides additional explanation of accessible markup practices primarily to help publishers understand the requirements to meet WCAG 2.0 Success Criterion 1.3.1. Other topics, such as scripted interactivity and media overlays are also covered.