A cue belongs to an interval
A cue has timing and associated content. For a simple example, a line starting at second twelve and ending at second fifteen belongs to that interval of the media timeline. It does not mean the line was spoken at 12:15 on a wall clock or that the video itself lasts fifteen seconds.
The same words can require different timing in another edit. An extra opening ident, removed scene or different frame-rate conversion can shift alignment. A subtitle file labelled with the right film title is therefore not enough evidence that it matches the edition currently playing.
Track purpose affects presentation
A caption track can include relevant non-speech information, a translated subtitle track serves another language purpose and a chapter track can drive navigation. Those uses share timed-text machinery but should not be presented as interchangeable accessibility features. Choose the purpose and label accurately.
A WebVTT file is not a media recording. It can preserve text and timing while omitting the moving picture and sound. A programme's complete transcript is also a separate editorial deliverable; some timed text intentionally omits information or represents only selected metadata.
Check the complete viewing task
For a publisher or developer, check parsing, selected track, cue activity, readable rendering and alignment at several content positions. A single correct opening line cannot establish that a later edit remains aligned. Keep the exact media edition and track identity in the quality record.
For a viewer report, supply the programme, episode, selected language and a content position showing the problem. Distinguish wrong wording from late timing and invisible rendering. Those observations lead to different editorial or technical fixes, and changing global font size will not repair a translation error or a subtitle file authored for another cut.
Questions about this guide
Is a WebVTT file a copy of the video?
No. It contains timed text or metadata.
Does a matching film title guarantee alignment?
No. The exact media edition and timing must match.