statechange-iframe-destroy-child.html

<html>
<script>
'use strict;'

let cnt = 0;

function causeIssue() {
  youConnection = new RTCPeerConnection({});

  youConnection.onsignalingstatechange = ev => {
    if(cnt==1) {
      parent.trigger();
    }
    cnt++;
  };
  var offerOptions = {
    offerToReceiveVideo: 1
  };

  youConnection.createOffer(offerOptions)
    .then(async function(offer) {
      await youConnection.setLocalDescription(offer);
      // Cause an implicit rollback.
      youConnection.setRemoteDescription(offer);
    });
}

causeIssue();
</script>
</html>

chromium/third_party/blink/web_tests/fast/peerconnection/resources/statechange-iframe-destroy-child.html