Glossary

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Tactile Captions(also: Haptic Captions, Vibrotactile Captions)

An enhanced captioning approach that supplements traditional text-based captions with vibrotactile feedback, allowing deaf and hard of hearing viewers to feel non-speech sounds (such as phone rings, doorbells, footsteps, or objects falling) through a wrist-worn or body-worn…

Teletext(also: Ceefax, Oracle)

A text-based information service broadcast within the television signal that allowed viewers to access pages of text and simple graphics using their TV remote control. Originating in the UK with the BBC's Ceefax service in 1974, teletext provided news, weather, sports results,…

Timed Text(also: Timed Text Markup Language, TTML, DFXP)

Timed Text Markup Language (TTML) is a W3C standard for representing timed text content such as captions, subtitles, and other text synchronized with audio or video media. Originally developed as the Distribution Format Exchange Profile (DFXP), TTML provides an XML-based format…

Tiresias(also: Tiresias Screenfont, Tiresias Font Family)

A family of typefaces developed in 1998 by the Royal National Institute of Blind People (RNIB) specifically designed for legibility on screen displays, particularly television subtitling. Named after the blind prophet of Greek mythology, Tiresias became one of the most widely…

Transcript(also: Text Transcript, Video Transcript, Audio Transcript)

A written document containing the complete text of spoken content from a video or audio recording, presented separately from the media rather than synchronized with it. Unlike captions, which appear on-screen in real time as speech occurs, transcripts provide all text at once,…

Transcripts(also: Transcript, Text Transcript)

A written, text-based representation of spoken audio or audiovisual content. WCAG 2.1 success criterion 1.2.1 (Audio-only and Video-only Prerecorded) requires an alternative for time-based media — typically a transcript — for pre-recorded audio-only content such as podcasts,…

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