1) Open https://www.youtube.com https://www.youtube.com. 2) Hover one of the videos. 3) See it's enlarging and playing without audio but with transcriptions. S

1) Open https://www.youtube.com https://www.youtube.com. 2) Hover one of the videos. 3) See it's enlarging and playing without audio but with transcriptions. So, for the main page (and recommendations) of YT it's already done. How your idea is different from this?