text: document.addEventListener('DOMContentLoaded', function() {
      var okButton = document.getElementById('button1');
      okButton.addEventListener('click', function() {
          let oButton = document.createElement("BUTTON");
          oButton.innerHTML = "NEW BUTTON";
          oButton.id="button";
          oButton.classList.add("style-scope", "yt-button-renderer", "style-blue-text", "size-default");
          document.body.appendChild(oButton);
        });
  }, false);