chromium/third_party/blink/web_tests/wpt_internal/websocket-cookies/resources/set-cookie.https.html

<!DOCTYPE html>
<script src="/websockets/cookies/support/websocket-cookies-helper.sub.js"></script>
<script>
function notifySuccess(value) {
  window.parent.postMessage('DONE: ' + value, '*');
}

function notifyFailure(reason) {
  window.parent.postMessage('FAIL: ' + reason, '*');
}

let origin = WSS_ORIGIN;
if (location.search == '?remote') {
  origin = WSS_CROSS_SITE_ORIGIN;
}

setSameSiteCookies(origin, 'value').then(
  () => connectAndGetRequestCookiesFrom(origin),
  notifyFailure
).then(
  cookies => {
    return clearSameSiteCookies(origin).then(() => {
      notifySuccess(cookies);
    });
  }
).catch(
  notifyFailure
);
</script>