sxg-subresource.tentative.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /signed-exchange/subresource/sxg-subresource.tentative.html - WPT Dashboard Interop Dashboard

<!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>