text: // https://www.w3schools.com/howto/howto_js_full_page_tabs.asp
  
  function openPage(pageName, elmnt, color) {
      var i, tabcontent, tablinks
      tabcontent = document.getElementsByClassName("tabcontent")
      for (i = 0; i < tabcontent.length; i++) {
        tabcontent[i].style.display = "none"
      }
    
      tablinks = document.getElementsByClassName("tablink")
      for (i = 0; i < tablinks.length; i++) {
        tablinks[i].style.backgroundColor = ""
      }
  
      document.getElementById(pageName).style.display = "block"
      elmnt.style.backgroundColor = color
    }
    document.getElementById("defaultOpen").click();