docs/packages/webrtc-demo/demo5/peer2.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>sender</title>
  </head>
  <body>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/peerjs/0.3.16/peer.min.js"></script>
    <script>
      const peer = new Peer('sender', {
        host: 'localhost',
        port: 9000,
        path: '/',
      })
      const conn = peer.connect('receiver')
      conn.on('open', () => {
        conn.send('hi!')
      })
    </script>
  </body>
</html>