YouTube does not allow you to automatically repeat videos, but there are using of this trick that allows you to repeat any youtube video. You just follow the steps below to repeat any of YouTube videos. And Also Browse to youtube video and edit the URL in the address bar.
1 : Remove Everything before your youtube keyword in the web url.(Remove WWW.)
https://www.youtube.com/watch?v=zYmnSCiE8go
Example :
youtube.com/watch?v=zYmnSCiE8go
2 : After youtube type repeat to make the above example URL the URL shown below and then press enter.
youtuberepeat.com/watch?v=zYmnSCiE8go
3 : And Hit Enter.