Indicates that synchronized open captions are available for audio and video content.


Example 1 — EPUB 3
<meta property="schema:accessibilityFeature">
Example 2 — EPUB 2
<meta name="schema:accessibilityFeature"
Example 3 — Audiobooks
"accessibilityFeature": ["openCaptions"]


The openCaptions value is used to indicate that a publication includes open captions for auditory content.

Open captions are burned directly into the video stream and are always visible in an unchangeable form. Closed captions, by contrast, are defined separately from the video stream, allowing users to turn them on or off and control their appearance.

Open captions provide a transcription of the dialogue that is being spoken as well as describe any relevant sounds that are occurring (e.g., music playing, a phone ringing, etc.). They are intended to help when the audio is muted or cannot be fully heard.

Open captions are not the same as subtitles, which are strictly a transcription of the dialogue (and typically available in additional languages than that being spoken). They differ from audio descriptions in that they do not describe actions.

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