HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>migrate document.clear</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} #target{border:1px dashed #999;padding:1rem;margin:1rem 0;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <div id="target">
    <p>Line 1</p>
    <p>Line 2</p>
  </div>
  <button id="legacy">document.clear() (no effect)</button>
  <button id="modern">clearContainer(target)</button>
  <pre id="out"></pre>
  <script>
    function clearContainer(element) {
      if (element.replaceChildren) {
        element.replaceChildren();
      } else {
        element.innerHTML = "";
      }
    }
    var target = document.getElementById("target");
    document.getElementById("legacy").addEventListener("click", function () {
      document.clear();
      document.getElementById("out").textContent = "After document.clear(): target still has " + target.childElementCount + " children (MDN no-op)";
    });
    document.getElementById("modern").addEventListener("click", function () {
      clearContainer(target);
      document.getElementById("out").textContent = "After clearContainer(): target has " + target.childElementCount + " children";
    });
  </script>
</body>
</html>

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Document.clear — migrate legacy call (Try It)