HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>active — MDN</title>
</head>
<body>
  <button id="start">Start</button>
  <pre id="out">Click Start (allow camera/mic if prompted).</pre>
  <script>
    var startBtn = document.getElementById("start");
    var out = document.getElementById("out");
    var stream;

    startBtn.addEventListener("click", function () {
      if (!window.isSecureContext) {
        out.textContent = "Need HTTPS or localhost for getUserMedia.";
        return;
      }
      if (!navigator.mediaDevices || !navigator.mediaDevices.getUserMedia) {
        out.textContent = "mediaDevices.getUserMedia not available.";
        return;
      }
      navigator.mediaDevices
        .getUserMedia({ audio: true, video: true })
        .then(function (s) {
          stream = s;
          out.textContent = "active: " + stream.active;
          startBtn.disabled = stream.active;
        })
        .catch(function (err) {
          out.textContent = "Error: " + err.message;
        });
    });
  </script>
</body>
</html>

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MediaStream.active — MDN getUserMedia (Try It)