HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>insertAdjacentElement return</title>
</head>
<body>
  <div id="box"></div>
  <button type="button" id="btn">Insert chip</button>
  <pre id="out">—</pre>
  <script>
    var box = document.getElementById("box");
    document.getElementById("btn").onclick = function () {
      var chip = document.createElement("span");
      chip.textContent = "chip";
      var inserted = box.insertAdjacentElement("beforeend", chip);
      document.getElementById("out").textContent = inserted
        ? "inserted: " + inserted.textContent
        : "insertion failed";
    };
  </script>
</body>
</html>

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Element.insertAdjacentElement — return value (Try It)