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WebVTT chapter title text is syntactically a subset of WebVTT cue text, and WebVTT cue text is syntactically a subset of WebVTT metadata text. Conformance checkers, when validating WebVTT files, may offer to restrict all cues to only having WebVTT chapter title text or WebVTT cue text as their cue payload; WebVTT metadata text cues are only useful for scripted applications (using the metadata [http://www.whatwg.org/specs/web-apps/current-work/#text-track-kind text track kind]).