text: function openTab(tabName) {
      var i, tabcontent, tablink;
      tabcontent = document.getElementsByClassName("tabcontent");
      for (i = 0; i < tabcontent.length; i++) {
          tabcontent[i].style.display = "none";
      }
      tablink = document.getElementsByClassName("tablinks");
      for (i = 0; i < tablink.length; i++) {
          tabcontent[i].style.display = "none";    
      }
      document.getElementById(tabName).style.display = "block";
  }
      
  // Get the element with id="defaultOpen" and click on it
  document.getElementById("defaultOpen").click();