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  <title>serial — getPorts</title>
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  <script>
    async function listGranted() {
      if (!navigator.serial) {
        return "Web Serial not supported.";
      }
      var ports = await navigator.serial.getPorts();
      return "granted ports: " + ports.length;
    }
    listGranted().then(function (msg) {
      document.getElementById("out").textContent = msg;
    });
  </script>
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serial — getPorts (Try It)