text: var tabBackground = bootstrap.Tab.getOrCreateInstance(
    document.getElementById("nav-background")
  ); // Returns a Bootstrap tab instance
  var tabButtonBackground = document.getElementById("nav-background-tab");
  var tabBorder = bootstrap.Tab.getOrCreateInstance(
    document.getElementById("nav-border")
  ); // Returns a Bootstrap tab instance
  var tabButtonBorder = document.getElementById("nav-border-tab");
  var tabButtons = bootstrap.Tab.getOrCreateInstance(
    document.getElementById("nav-buttons")
  ); // Returns a Bootstrap tab instance
  var tabButtonButtons = document.getElementById("nav-buttons-tab");
  var tabOpacity = bootstrap.Tab.getOrCreateInstance(
    document.getElementById("nav-opacity")
  ); // Returns a Bootstrap tab instance
  var tabButtonOpacity = document.getElementById("nav-opacity-tab");
  var tabPosition = bootstrap.Tab.getOrCreateInstance(
    document.getElementById("nav-position")
  ); // Returns a Bootstrap tab instance
  var tabButtonPosition = document.getElementById("nav-position-tab");
  var tabShadows = bootstrap.Tab.getOrCreateInstance(
    document.getElementById("nav-shadows")
  ); // Returns a Bootstrap tab instance
  var tabButtonShadows = document.getElementById("nav-shadows-tab");
  var tabSizing = bootstrap.Tab.getOrCreateInstance(
    document.getElementById("nav-sizing")
  ); // Returns a Bootstrap tab instance
  var tabButtonSizing = document.getElementById("nav-sizing-tab");
  var tabText = bootstrap.Tab.getOrCreateInstance(
    document.getElementById("nav-text")
  ); // Returns a Bootstrap tab instance
  var tabButtonText = document.getElementById("nav-text-tab");
  var tabZIndex = bootstrap.Tab.getOrCreateInstance(
    document.getElementById("nav-z-index")
  ); // Returns a Bootstrap tab instance
  var tabButtonZIndex = document.getElementById("nav-z-index-tab");
  console.log(tabBackground);
  
  var tabEl = document.querySelector('button[data-bs-toggle="tab"]');
  console.log(tabEl);
  tabEl.addEventListener('shown.bs.tab', function (event) {
    event.target // newly activated tab
    console.log(event.target);
    event.relatedTarget // previous active tab
    console.log(event.relatedTarget);
  })