axe-core/lib/checks/media/caption.json

Accessibility engine for automated Web UI testing

{
  "id": "caption",
  "evaluate": "caption-evaluate",
  "metadata": {
    "impact": "critical",
    "messages": {
      "pass": "The multimedia element has a captions track",
      "incomplete": "Check that captions is available for the element"
    }
  }
}