upstream-pion-webrtc/examples/ice-single-port/index.html

<html>
  <!--
    SPDX-FileCopyrightText: 2026 The Pion community <https://pion.ly>
    SPDX-License-Identifier: MIT
  -->
  <head>
    <title>ice-single-port</title>
  </head>

  <body>
    <h3> ICE Selected Pairs </h3>
    <div id="iceSelectedPairs"></div> <br />
  </body>

  <script>
    let createPeerConnection = () => {
      let pc = new RTCPeerConnection()
      let dc = pc.createDataChannel('data')

      dc.onopen = () => {
        let el = document.createElement('template')
        let selectedPair = pc.sctp.transport.iceTransport.getSelectedCandidatePair()

        el.innerHTML = `<div>
          <ul>
             <li> <i> Local</i> - ${selectedPair.local.candidate}</li>
             <li> <i> Remote</i> - ${selectedPair.remote.candidate} </li>
          </ul>
        </div>`

        document.getElementById('iceSelectedPairs').appendChild(el.content.firstChild);
      }

      pc.createOffer()
        .then(offer => {
          pc.setLocalDescription(offer)

          return fetch(`/doSignaling`, {
            method: 'post',
            headers: {
              'Accept': 'application/json, text/plain, */*',
              'Content-Type': 'application/json'
            },
            body: JSON.stringify(offer)
          })
        })
        .then(res => res.json())
        .then(res => pc.setRemoteDescription(res))
        .catch(alert)
    }

    for (i = 0; i < 10; i++) {
      createPeerConnection()
    }
  </script>
</html>