JSFiddle - React, Tailwind, and code Playground

HTML

Video URL:<br>
  <input id="url" type="url" />
  <iframe width="560" height="315"  id="myframe" frameborder="0" allowfullscreen></iframe>
  <button type="button" id="mybutton" onclick="return embed();" >embed it!</button>

JavaScript

function embed()
{
    var url = document.getElementById('url').value 
		document.getElementById('myframe').src = url;

}

document.getElementById("mybutton").addEventListener("click", embed);