Audio descriptions provide relevant information for videos that dialogue
cannot, such as facial expressions and scenes.
Lighthouse reports any
<video> elements that are missing a
with the attribute
How to fix the problem
To fix the problem,
add at least one track element to the
<video width="300" height="200">
<source src="marathonFinishLine.mp4" type="video/mp4">
<track src="captions_en.vtt" kind="captions" srclang="en" label="english_captions">
<track src="audio_desc_en.vtt" kind="descriptions" srclang="en" label="english_description">
<track src="captions_es.vtt" kind="captions" srclang="es" label="spanish_captions">
<track src="audio_desc_es.vtt" kind="descriptions" srclang="es" label="spanish_description">
Learn more in
<video> elements must have an audio description
The example above includes both audio descriptions for visually impaired users
and captions for hearing impaired users.
Captions make video elements usable for deaf or hearing-impaired users.
See also Ensures
<video> elements have captions.
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