What does WebVTT mean?
WebVTT is a timed-text format used with web media. It can carry caption or subtitle cues and associated presentation information for a compatible browser or player to display alongside video.
Why it matters
It is not a video codec and does not establish the language or accessibility quality of the text inside it. The player must retrieve and parse the track separately from the media, so video can work while captions fail. Delivery errors, malformed cues, unsupported styling and wrong language selection create different symptoms that should be described separately.
A practical example
If a programme plays normally but its selected text never appears, try another supplied track and record the app, language and title. Changing the video resolution will not necessarily repair a missing or malformed WebVTT track, and private media URLs should not be posted publicly for diagnosis.
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Related terminology: Web player, White point.
For practical setup and troubleshooting, browse the journal or support guides.