TOOGLE
Navbar-Tailwind - Front-End
<head>
    <meta charset="utf-8" />
    <title>Hello World</title>
 <script src="https://cdn.tailwindcss.com"></script>
    <!-- CSS for presentation. -->
    <style>
<link rel="stylesheet" type="text/css" href="mystyle.css">
    </style>
</head>
<body>
<nav class="bg-gray-900">
    <div class="max-w-screen-xl flex flex-wrap items-center justify-between mx-auto p-4">
      <a href="#" class="flex items-center space-x-3 rtl:space-x-reverse">
          <span class="self-center text-2xl font-semibold text-white">Logo</span>
      </a>
    <div class="md:hidden  flex md:order-2 space-x-3 md:space-x-0 rtl:space-x-reverse">
      <button id="menuButton" data-collapse-toggle="navbar-cta" type="button" class="inline-flex items-center p-2 w-10 h-10 justify-center text-sm rounded-lg md:hidden text-gray-400 hover:bg-gray-700 focus:ring-gray-600" aria-controls="navbar-cta" aria-expanded="false">
          <svg class="w-5 h-5" aria-hidden="true" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 17 14">
              <path stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M1 1h15M1 7h15M1 13h15"/>
          </svg>
      </button>
    </div>
    <div class="flex hidden w-full md:flex md:w-auto md:order-1" id="navbarDrop">
      <ul class="flex flex-col text-center font-medium p-4 md:p-0 mt-4 md:space-x-8 rtl:space-x-reverse md:flex-row md:mt-0 bg-gray-900">
        <li>
          <a href="#" class="block py-2 px-3 md:p-0 text-white hover:text-blue-800">Home</a>
        </li>
        <li>
          <a href="#" class="block py-2 px-3 md:p-0 text-white hover:text-blue-800">About</a>
        </li>
      </ul>
    </div>
    </div>
</nav>
 <script src="/path/to/example.js"></script>
 
</body>
---------------------------------------------------------
var menuButton = document.getElementById("menuButton");
var navbarDrop = document.getElementById("navbarDrop");

menuButton.addEventListener("click", () => {
  var statusDrop = navbarDrop.classList.contains("hidden");
  if(statusDrop){
    navbarDrop.classList.remove("hidden");
  }else{
    navbarDrop.classList.add("hidden");
  }
});