02_vanilla_js_dom.html

<!doctype html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <div id="root"></div>

    <script>
      const root = document.getElementById("root"); // HTMLDivElement

      const ul = document.createElement("ul"); // HTMLUListElement

      const li1 = document.createElement("li"); // HTMLLIElement
      li1.textContent = "item 1";

      const li2 = document.createElement("li"); // HTMLLIElement
      li2.textContent = "item 2";
      li2.className = "active";

      const linkName = "item 3";
      const linkAddress = "http://abc.com";
      const li3 = document.createElement("li");
      li3.innerHTML = `<a href=${linkAddress}>${linkName}</a>`;

      ul.appendChild(li1);
      ul.appendChild(li2);
      ul.appendChild(li3);

      root.appendChild(ul);

      console.log(ul);
    </script>
  </body>
</html>