Understanding Success Criterion 1.2.4: Captions (Live)

Understanding Success Criterion 1.2.4 Captions (Live)

Live videos should have captions that are synchronized with the audio part of the video. Live captions will help to convey the information of the audio content to people who are deaf or hard of hearing.

Official Requirements

Success Criterion 1.2.4 Captions (Live) (Level AA): Captions are provided for all live audio content in synchronized media.

Why is it required?

Live captions enable people with hearing impairments to watch real-time presentations. It also helps people whose primary language is not the same as the language used in the video. Furthermore, it also helps people to view the video in a noisy environment.

Captions will also help hearing-impaired people to identify speakers, non-verbal content such as notate sound effects, and other significant audio.  

How do we fix it?

Provide captions that are perfectly synchronized with the audio content of the video. It should also include dialogues, identifying speakers, sound effects, and other audio. 

Here are some examples of where live captions are required

  • Live news broadcast
  • Live sports commentaries
  • Live webinars
  • Live events broadcast

Mistakes to avoid

  • The live video doesn’t have captions 
  • The live captions are not synchronized with the audio part of the video
  • Using media players that don’t support captions


Understanding Success Criterion 1.2.4: Captions (Live)

Picture of Aditya Bikkani

Aditya Bikkani

Aditya is the COO of AELData, a growing technology company in the Digital Publishing and Education sectors. He is also an entrepreneur and founder of an accessibility tool called LERA. A W3C COGA (Cognitive and Learning Disabilities Accessibility) Community Member Aditya contributes to researching methodologies to improve web accessibility and usability for people with cognitive and learning disabilities.

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