JSFiddle - React, Tailwind, and code Playground

HTML

<!--
	SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
	SPDX-License-Identifier: MIT
-->
Remote Session Description (Paste offer from Go code here)
<br/>
<textarea id="remoteSessionDescription"></textarea>
<br/>
<button onclick="window.startSession()">Start Session</button>
<br/>
<br/>
<br/>

Browser Session Description (Copy this to answer.txt file)
<br/>
<textarea id="localSessionDescription" readonly="true"></textarea>
<br/>

<button onclick="window.copySessionDescription()">Copy browser Session Description to clipboard</button>

<br/>
<br/>

Video
<br/>
<div id="remoteVideos"></div> <br />

Logs
<br/>
<div id="div"></div>

CSS

/*
    SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
    SPDX-License-Identifier: MIT
*/
textarea {
    width: 500px;
    min-height: 75px;
}

JavaScript

/* eslint-env browser */

// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
// SPDX-License-Identifier: MIT

const pc = new RTCPeerConnection({
  iceServers: [{
    urls: 'stun:stun.l.google.com:19302'
  }]
})
const log = msg => {
  document.getElementById('div').innerHTML += msg + '<br>'
}

pc.ontrack = function (event) {
  const el = document.createElement(event.track.kind)
  el.srcObject = event.streams[0]
  el.autoplay = true
  el.controls = true

  document.getElementById('remoteVideos').appendChild(el)
}

pc.oniceconnectionstatechange = e => log(pc.iceConnectionState)
pc.onicecandidate = event => {
  if (event.candidate === null) {
    document.getElementById('localSessionDescription').value = btoa(JSON.stringify(pc.localDescription))
  }
}

window.startSession = () => {
  const sd = document.getElementById('remoteSessionDescription').value
  if (sd === '') {
    return alert('Session Description must not be empty')
  }

  try {
    // Set the remote offer
    pc.setRemoteDescription(JSON.parse(atob(sd))).then(() => {
      // Create answer
      return pc.createAnswer()
    }).then(answer => {
      // Set local description with the answer
      return pc.setLocalDescription(answer)
    }).catch(log)
  } catch (e) {
    alert(e)
  }
}

window.copySessionDescription = () => {
  const browserSessionDescription = document.getElementById('localSessionDescription')

  browserSessionDescription.focus()
  browserSessionDescription.select()

  try {
    const successful = document.execCommand('copy')
    const msg = successful ? 'successful' : 'unsuccessful'
    log('Copying SessionDescription was ' + msg)
  } catch (err) {
    log('Oops, unable to copy SessionDescription ' + err)
  }
}