ar progressProto = Object.create(HTMLElement.prototype);
    var importDoc = document.currentScript.ownerDocument;
  
    progressProto.createdCallback = progressProtoCreatedCallback;
  
    function progressProtoCreatedCallback() {
      var template = importDoc.querySelector('#template-web-presentation-progress');
      var templateContent = document.importNode(template.content, true);
      this.createShadowRoot().appendChild(templateContent);
  
      this.parentNode.addEventListener('SlideChanged', upd