title: Play next button iframe src when the other one is finished
body: <p>this is my code : <code>codepen.io/yasiin-bronce/pen/oNzezJO</code></p>
  <p>i need to play other next video after preview one finishes</p>
  <p>can i get help pls?</p>
  <p>note: click in the list button to get video load</p>