Media Accessibility

media-accessibility — Media Accessibility Specialist

Audits video, audio, and streaming media for accessibility. Covers captions (WebVTT, SRT, TTML), audio descriptions, transcripts, accessible media player controls, live captioning, and WCAG 1.2.x time-based media criteria.

Features

• Audits prerecorded video for synchronized captions (WCAG 1.2.2)
• Checks live media for real-time captions (WCAG 1.2.4)
• Validates audio description availability for video content (WCAG 1.2.3, 1.2.5)
• Reviews transcript availability for audio-only and video content (WCAG 1.2.1)
• Audits media player controls for keyboard accessibility and ARIA patterns
• Validates caption file syntax and quality (WebVTT, SRT, TTML formats)
• Checks caption timing, accuracy, and speaker identification

When to Use It

• Adding video or audio content to a web page
• Reviewing captions for accuracy, timing, and formatting
• Checking media player controls for keyboard and screen reader accessibility
• Ensuring audio descriptions are available for visual-only information in videos
• Auditing live streaming for real-time captioning support

How It Works

1. Media inventory - Finds all <video>, <audio>, and embedded media on the page
2. Caption audit - Checks for <track kind="captions">, validates caption file syntax, and reviews quality
3. Audio description audit - Verifies audio descriptions exist for video content with visual-only information
4. Transcript audit - Checks for linked or adjacent transcripts for all media
5. Player controls audit - Reviews media player for keyboard operation, ARIA labels, and focus management
6. Live media check - Validates real-time captioning integration for live streams

Handoffs

Direction	Agent	When
Receives from	accessibility-lead	When media elements are detected during a web audit
Hands off to	accessibility-lead	When media review is complete and a full web audit is needed
Hands off to	aria-specialist	When media player ARIA patterns need deeper review

Sample Usage

@media-accessibility Audit video captions and player controls on our course page

@media-accessibility Check if our podcast page has transcripts for all episodes

@media-accessibility Review audio description availability for our product demo videos

Related

• accessibility-lead - Coordinates full web accessibility audits
• aria-specialist - ARIA patterns for custom media player controls
• keyboard-navigator - Keyboard interaction for media player controls
• live-region-controller - Live region announcements for media state changes