Special Treatments to Multimedia, Embedded and Downloadable Files

• For videos, captions must be provided in a synchronized way.
  Understanding WCAG 2.0 - Captions (Prerecorded)
• For audios, a text transcript must be provided separately.
  Understanding WCAG 2.0 - Audio-only and Video-only (Prerecorded)
• For documents like PDFs, accessibility support must be included.
  PDF Techniques for WCAG 2.0
• For CAPTCHA, developers should minimize the barrier to users with disabilities.
  Understanding WCAG 2.0 - Non-text Content
• Flash-based content is prohibited, for its web accessibility, mobile accessibility, SEO and security issues.