WebVTT

WebVTT (Web Video Text Tracks) is the W3C standard text format for providing timed text tracks — including captions, subtitles, descriptions, chapters, and metadata — synchronized with HTML5 <video> and <audio> elements. WebVTT evolved from the earlier SRT subtitle format, adding support for styling (via CSS), positioning, voice identification (for caption speaker labeling), and vertical text. A WebVTT file consists of a series of cues, each with a time range and text content. WebVTT is the native format used with the HTML5 <track> element and is supported by all modern browsers. It has largely replaced proprietary and format-specific captioning approaches for web video, providing a simple, human-readable text format that can be created with any text editor and processed by automated tools.