HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>replaceWith vs replaceChildren</title>
  <style>
    #box { padding: 12px; border: 1px solid #ccc; margin: 8px 0; }
  </style>
</head>
<body>
  <div id="box">
    <div id="inner"><p>Inside</p></div>
  </div>
  <button type="button" id="childrenBtn">replaceChildren on #inner</button>
  <button type="button" id="withBtn">replaceWith on #inner</button>
  <pre id="out">—</pre>
  <script>
    var box = document.getElementById("box");
    var inner = document.getElementById("inner");
    var out = document.getElementById("out");
    document.getElementById("childrenBtn").addEventListener("click", function () {
      inner.replaceChildren("Only text inside");
      out.textContent = box.innerHTML;
    });
    document.getElementById("withBtn").addEventListener("click", function () {
      var section = document.createElement("section");
      section.textContent = "Replaced element";
      inner.replaceWith(section);
      out.textContent = box.innerHTML;
    });
  </script>
</body>
</html>

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replaceWith vs replaceChildren (Try It)