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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>replaceChild MDN</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var parentDiv = document.createElement("div");
    var sp2 = document.createElement("span");
    sp2.id = "childSpan";
    sp2.textContent = "foo bar";
    parentDiv.appendChild(sp2);
    var sp1 = document.createElement("span");
    sp1.id = "newSpan";
    sp1.appendChild(document.createTextNode("new replacement span element."));
    parentDiv.replaceChild(sp1, sp2);
    document.getElementById("out").textContent =
      parentDiv.firstChild.id + "\n" +
      parentDiv.firstChild.textContent + "\n" +
      parentDiv.contains(sp2);
  </script>
</body>
</html>

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Node.replaceChild — MDN swap (Try It)