HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>importNode template</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} .card{border:1px solid #ccc;padding:0.75rem;margin-top:0.5rem;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <template id="card-tpl">
    <div class="card">Imported card from &lt;template&gt;</div>
  </template>
  <button id="btn" type="button">Import template</button>
  <div id="host"></div>
  <pre id="out">Click the button</pre>
  <script>
    document.getElementById("btn").addEventListener("click", function () {
      var template = document.getElementById("card-tpl");
      var fragment = document.importNode(template.content, true);
      document.getElementById("host").appendChild(fragment);
      document.getElementById("out").textContent =
        "cards in host: " + document.querySelectorAll("#host .card").length;
    });
  </script>
</body>
</html>

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