HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>queryCommandEnabled toolbar</title>
  <style>body{font-family:system-ui,sans-serif;margin:1rem;}#editor{border:1px solid #ccc;padding:0.75rem;min-height:3rem;margin:0.5rem 0;}</style>
</head>
<body>
  <button id="boldBtn" type="button">Bold</button>
  <div id="editor" contenteditable="true">Focus me, then check the button</div>
  <pre id="out"></pre>
  <script>
    var btn = document.getElementById("boldBtn");
    var editor = document.getElementById("editor");
    editor.focus();
    var enabled =
      typeof document.queryCommandEnabled === "function" &&
      document.queryCommandEnabled("bold");
    btn.disabled = !enabled;
    btn.textContent = enabled ? "Bold (enabled)" : "Bold (disabled)";
    document.getElementById("out").textContent =
      "toolbar bold enabled: " + enabled;
  </script>
</body>
</html>

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Document.queryCommandEnabled — toolbar gate (Try It)