HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>queryCommandSupported paste</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var lines = [];
    var pasteSupported =
      typeof document.queryCommandSupported === "function"
        ? document.queryCommandSupported("paste")
        : false;
    lines.push("paste supported: " + pasteSupported);
    if (!pasteSupported) {
      lines.push("MDN: false can mean unavailable OR insufficient privileges");
      lines.push("Prefer navigator.clipboard.readText() for new apps");
    }
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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Document.queryCommandSupported — paste privilege note (Try It)