HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>removeChild clear</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var box = document.createElement("div");
    box.appendChild(document.createElement("span"));
    box.appendChild(document.createElement("span"));
    box.appendChild(document.createTextNode("x"));
    var before = box.childNodes.length;
    while (box.firstChild) {
      box.removeChild(box.firstChild);
    }
    document.getElementById("out").textContent =
      before + "\n" +
      box.childNodes.length;
  </script>
</body>
</html>

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Node.removeChild — clear all (Try It)