HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>queryCommandSupported report</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var commands = ["bold", "insertText", "SelectAll", "copy", "paste"];
    var report = commands.map(function (name) {
      var supported =
        typeof document.queryCommandSupported === "function"
          ? document.queryCommandSupported(name)
          : false;
      return name + ": " + (supported ? "yes" : "no");
    });
    document.getElementById("out").textContent = report.join("\n");
  </script>
</body>
</html>

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Document.queryCommandSupported — command report (Try It)