HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>wholeText normalize</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var div = document.createElement("div");
    div.appendChild(new Text("Part 1 "));
    div.appendChild(new Text("Part 2"));
    var first = div.firstChild;
    var lines = [
      div.childNodes.length,
      first.wholeText
    ];
    div.normalize();
    lines.push(div.childNodes.length);
    lines.push(div.firstChild.data);
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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Text.wholeText — vs normalize (Try It)