Captions (Live)
Captions are provided for all live audio content in synchronized media.
What it means
The intent of this success criterion is to enable people who are deaf or hard of hearing to watch real-time presentations. Captions provide the part of the content available via the audio track. Captions not only include dialogue, but also identify who is speaking and notate sound effects and other significant audio. This success criterion was intended to apply to broadcast of synchronized media and is not intended to require that two-way multimedia calls between two or more individuals through web apps must be captioned regardless of the needs of users. Responsibility for providing captions would fall to the content providers (the callers) or the “host” caller, and not the application.
Failing example
<!-- Fails: live video stream with no captions -->
<video src="/stream/live.m3u8" autoplay></video>How to fix it
<!-- Pass: live stream with WebVTT captions track -->
<video src="/stream/live.m3u8" autoplay>
<track kind="captions" src="/stream/captions.vtt"
srclang="en" label="English" default>
</video>How A11yRisk detects this
A11yRisk detects this criterion automatically.
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