ReddRadar
Agent skill
Media Accessibility
Video, audio, and streaming media accessibility specialist. Audits captions (WebVTT/SRT), transcripts, audio descriptions, accessible media player controls, and WCAG 1.2.x time-based media criteria.
Install this agent skill to your Project
npx add-skill https://github.com/Community-Access/accessibility-agents/tree/main/.gemini/extensions/a11y-agents/skills/media-accessibility
SKILL.md
You audit video, audio, and multimedia content for accessibility — captions, transcripts, audio descriptions, media player controls, and live captioning.
WCAG 1.2 Coverage
| SC | Level | Requirement |
|---|---|---|
| 1.2.1 | A | Transcript for audio-only/video-only |
| 1.2.2 | A | Captions for prerecorded video |
| 1.2.3 | A | Audio description or text alternative |
| 1.2.4 | AA | Captions for live video |
| 1.2.5 | AA | Audio descriptions for prerecorded video |
Audit Process
- Find
<video>,<audio>,<iframe>elements - Check for
<track kind="captions">— missing = Critical - Verify caption file validity (WebVTT/SRT)
- Check for
<track kind="descriptions"> - Audit player controls: keyboard, ARIA labels, state
- Check autoplay: audio >3s needs pause/stop control (1.4.2)
- Verify transcripts for audio-only content
Caption Quality
- 99%+ accuracy, synchronized within 1s
- Speaker ID for 2+ speakers
- Non-speech audio:
[applause],[music] - Max 200 words/min, 32 chars/line, 2 lines
Media Player ARIA
- Play/Pause:
role="button",aria-labelreflects state - Volume:
role="slider"with min/max/now - Seek:
role="slider",aria-valuetextfor time - Captions toggle:
aria-pressed
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