HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>pseudo unstyled</title>
</head>
<body>
  <div id="plainBox">No ::marker CSS on this div</div>
  <pre id="out"></pre>
  <script>
    var box = document.getElementById("plainBox");
    var out = document.getElementById("out");
    if (typeof box.pseudo !== "function") {
      out.textContent = "pseudo() not supported in this browser";
    } else {
      try {
        var marker = box.pseudo("::marker");
        out.textContent =
          "marker !== null: " + (marker !== null) + "\n" +
          "marker.type: " + (marker ? marker.type : "n/a");
      } catch (e) {
        out.textContent = "Error: " + e.message;
      }
    }
  </script>
</body>
</html>

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Element.pseudo — valid type without CSS (Try It)