Documentation for VTT has now been merged, and we are just waiting for the BCD updates to be reviewed, so I am setting this to DDC.
Bug 2001878 Comment 14 Edit History
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Documentation for VTT has now been merged, and we are just waiting for the BCD updates to be reviewed, so I am setting this to DDC. See https://github.com/mdn/content/issues/42258 for PR links.