HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>mozBrightness detect</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var lines;
    if ("mozBrightness" in window.screen) {
      lines = ["mozBrightness is present (legacy)", typeof screen.mozBrightness];
    } else {
      lines = ["mozBrightness not supported"];
    }
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

Lines: 0 | Characters: 0

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Screen.mozBrightness — detect (Try It)