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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>remove MDN basic</title>
  <style>
    div { padding: 10px; margin: 6px 0; border: 1px solid #ccc; }
    #div-02 { background: #fee2e2; }
  </style>
</head>
<body>
  <div id="div-01">Here is div-01</div>
  <div id="div-02">Here is div-02</div>
  <div id="div-03">Here is div-03</div>
  <button type="button" id="btn">Remove div-02</button>
  <pre id="out">—</pre>
  <script>
    document.getElementById("btn").addEventListener("click", function () {
      var el = document.getElementById("div-02");
      el.remove();
      document.getElementById("out").textContent =
        document.getElementById("div-02") === null ? "null" : "still exists";
    });
  </script>
</body>
</html>

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Element.remove — MDN basic (Try It)