WCAG 2.1 – Criterion 1.2.4 – Live Captions (Level AA)

Criterion 1.2.4 (Level AA) concerns captions that should be added to live multimedia, such as interviews, podcasts, television news, or sports events.

The aim of this criterion is to enable all interested parties to participate in events (online or offline) in real time.
Who might find this useful? For example, Deaf individuals, but also those who cannot currently turn on audio. All parents probably know this trick – it’s inclusive design at its best.
Captions should not only include dialogues but also describe what is happening on the screen, as well as who is speaking. Reactions such as laughter, crying, or applause should also be described.

A good example is BBC television, which meets the requirements of WCAG 2.1. Their live broadcasts include appropriate captions. Link to BBC example

An interesting article about what it’s like to work as a caption creator (article in English):
Link to article
WCAG 2.1 Reference – 1.2.4 AA
Link to reference