HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>writeln alternative</title>
  <style>body{font-family:system-ui,sans-serif;margin:1rem;}#host{border:1px solid #ccc;padding:1rem;min-height:80px;} pre#out{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <div id="host"><p>Old content</p></div>
  <button id="btn" type="button">Rebuild with DOM APIs</button>
  <pre id="out">Click the button</pre>
  <script>
    document.getElementById("btn").addEventListener("click", function () {
      var host = document.getElementById("host");
      host.replaceChildren();
      var pre = document.createElement("pre");
      pre.textContent = "Out with the old\nin with the new!";
      host.append(pre);
      document.getElementById("out").textContent =
        "children: " + host.children.length + " (no document.writeln)";
    });
  </script>
</body>
</html>

Lines: 0 | Characters: 0

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Modern alternative — createElement + textContent (Try It)