To create Youtube embedded code with LOOP, first create a playlist and add the video you wanted to have as loop. Use below code, change your video link (url) and playlist link (url).
<iframe width="100%" height="425" src="https://www.youtube.com/embed/U-Vs550CRc4?autoplay=1&showinfo=0&loop=1&list=PLyU5X-W7kMhMj9oBTnP58QS7bV9AVkZu4&rel=0" frameborder="0" allowfullscreen></iframe>
CSS
.videoWrapper { position: relative; padding-bottom: 56.25%; /* 16:9 */ padding-top: 25px; height: 0; } .videoWrapper iframe { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }
HTML
<div class="videoWrapper"> <iframe width="100%" height="425" src="https://www.youtube.com/embed/U-Vs550CRc4?autoplay=1&showinfo=0&loop=1&list=PLyU5X-W7kMhMj9oBTnP58QS7bV9AVkZu4&rel=0" frameborder="0" allowfullscreen></iframe> </div>