HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>plugins live</title>
</head>
<body>
  <embed src="https://example.com/a.pdf" type="application/pdf" width="1" height="1">
  <pre id="out"></pre>
  <script>
    const before = document.plugins.length;
    const el = document.createElement("embed");
    el.src = "https://example.com/new.pdf";
    el.type = "application/pdf";
    el.width = 1;
    el.height = 1;
    document.body.insertBefore(el, document.getElementById("out"));
    document.getElementById("out").textContent =
      before + " → " + document.plugins.length;
  </script>
</body>
</html>

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