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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getGamepads — buttons</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    function describeFirstPad() {
      if (!navigator.getGamepads) return "getGamepads not supported";
      var gp = Array.from(navigator.getGamepads()).find(Boolean);
      if (!gp) return "No active gamepad";
      var btn0 = gp.buttons[0];
      return [
        "id: " + gp.id,
        "button0.pressed: " + (btn0 ? btn0.pressed : "n/a"),
        "button0.value: " + (btn0 ? btn0.value : "n/a"),
        "axes: [" +
          gp.axes
            .map(function (a) {
              return a.toFixed(2);
            })
            .join(", ") +
          "]"
      ].join("\n");
    }
    document.getElementById("out").textContent = describeFirstPad();
  </script>
</body>
</html>

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getGamepads — buttons and axes (Try It)