HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>supported enabled state</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var names = ["bold", "SelectAll", "copy", "paste"];
    var lines = names.map(function (name) {
      var supported =
        typeof document.queryCommandSupported === "function"
          ? document.queryCommandSupported(name)
          : false;
      var enabled =
        typeof document.queryCommandEnabled === "function"
          ? document.queryCommandEnabled(name)
          : false;
      var state =
        typeof document.queryCommandState === "function"
          ? document.queryCommandState(name)
          : null;
      return name + " → supported=" + supported + ", enabled=" + enabled + ", state=" + state;
    });
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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Document.queryCommandSupported — supported / enabled / state (Try It)