HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>queryCommandSupported</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <button id="btn" type="button">Check commands</button>
  <pre id="out">Click the button</pre>
  <script>
    document.getElementById("btn").addEventListener("click", function () {
      var commands = ["bold", "insertText", "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.execCommand — queryCommandSupported (Try It)