<!DOCTYPE html>
<title>Subresource signed exchange prefetch.</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/get-host-info.sub.js"></script>
<script src="../resources/sxg-util.js"></script>
<body>
<script>
promise_test(async (t) => {
  const iframe_path =  get_host_info().HTTPS_ORIGIN + '/signed-exchange/resources/sxg-subresource-iframe.html';
  const wait_message = (new Promise((resolve) => {
    const on_message = (event) => {
      window.removeEventListener('message', on_message);
      resolve(event.data);
    };
    window.addEventListener('message', on_message);
  }));
  withIframe(iframe_path);
  const message = await wait_message;
  assert_equals(message, 'from signed exchange');
}, 'Subresource signed exchange prefetch.');
</script>
</body>
