<html>
  <body>
    <script>
      try { o1 = window.open("") } catch (e) {}
      try { o1.location.reload() } catch (e) {}
      try { o2 = new RTCPeerConnection({iceServers: [{"url": "stun:d"}]}) } catch (e) {}
      try { o1.navigator.mediaDevices.getUserMedia({video: true, fake: true}).catch((error) => {}) } catch (e) {}
      try { o2.createOffer({offerToReceiveVideo: true}).then((offer) => {
        try { o1.navigator.mediaDevices.getUserMedia({video: true}) } catch (e) {};
      }) } catch (e) {}
    </script>
  </body>
</html>
