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Good morning. Here’s a method to loop play YouTube videos at a specific location. Here’s how it works: by appending the following parameter (value) to the address bar, the video will loop between 0 minutes and 1 minute and 1 second. By the way, setting loop=0 will result in an infinite loop, while loop=1 will make it loop only once.

&start=00:00&end=01:01&loop=0

Actually, for those using Chrome, there is a convenient extension available that allows you to loop YouTube videos without going through all this trouble. It seems to have been created by someone from China, probably an individual, but it works really well.

I’ll provide the link for you.
https://chrome.google.com/webstore/detail/looper-for-youtube/iggpfpnahkgpnindfkdncknoldgnccdg