Automatically replay HTML5 videos. Works with YT, Vimeo, etc, etc.

gistfile1.js

// Long version

document.querySelector('video').addEventListener('ended', function(e){
    var target = e.currentTarget;
        target.currentTime = 0;
        target.play();
    }
});

// Short version (snippet, bookmarklet?)

document.querySelector("video").addEventListener("ended",function(a){a=a.currentTarget;a.currentTime=0;a.play()});