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WebVTT arguments

These switches control validation of WebVTT files. Note the version of WebVTT against which files are checked will be derived from the version of HTML. WebVTT was first specified in November 2014.

vtt.extension ext Presume files with extension ‘.ext’ are WebVTT files (default: “vtt”).
vtt.verify Verify WebVTT files.

Dylan Harris
June 2025