How to play only the audio of a Youtube video using HTML 5?

Question

Is it possible to play only the audio from a YouTube video using HTML 5 and Javascript?

Answer 1

Embed the video player and use CSS to hide the video. If you do it properly you may even be able to hide only the video and not the controls below it.

However, I'd recommend against it, because it will be a violation of YouTube TOS. Use your own server instead if you really want to play only audio.