Success Criterion 1.2.4
Conformance level AA

Hybrid Event Where Only the Room, Not the Stream, Is Captioned

1.2.4 — Captions (Live)

Scenario

Setting

A ride-hailing app's trip booking screen

What’s wrong

Hybrid events where only the in-room feed is captioned, not the web stream.

Example

<div id="live-stream"><!-- live video, no caption feed --></div>

Why it matters

Deaf and hard-of-hearing participants in live streams, classes, and meetings.

How to test

For hybrid events, check the web stream specifically (not just the in-room screen): if only in-room viewers get captions, the web stream fails.

How to fix

Readable, reasonably accurate real-time captions must run for the entire live event.

<div id="live-stream"><!-- live video --></div>

<div id="live-captions" aria-live="polite"></div>

Real-time captions, from a human captioner or a checked automated feed, must ship with the live audio, not after it.

Outcome

On a ride-hailing app's trip booking screen, this barrier is gone for deaf and hard-of-hearing participants in live streams, classes — they get the same result as anyone else here.

Who is affected