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It's always a good idea to caption videos, whether it's for people with hearing impairments, people that are in a public space and don't have headphones with them, or for people that just can't quite understand what you're saying. Even if there's no spoken text in a video, it's still nice to point out sound effects and music, or even highlight the absence of sound.
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When creating a WebVTT file, it's a good idea to validate the file. In this video, we use this live WebVTT validator to check our work.
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