subtitle Format
WebVTT File Format
Web Video Text Tracks is the W3C standard for captioning HTML5 video elements (<track>). It supports CSS styling, voice tags, and cue alignment.
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Technical Specifications
| Extensions | .vtt |
| MIME Types | text/vtt |
| Category | Subtitle |
| Engine Tier | tier1-small-js |
| Magic Bytes / Sniffing | 0x57 0x45 0x42 0x56 0x54 0x54 |
| Opens With | HTML5 video players, browsers, YouTube, Vimeo |
| Good For | HTML5 web video, accessible streaming, and styled web captions. |
| Not Recommended For | Legacy standalone hardware media players that only parse SRT. |