testing/web-platform/tests/infrastructure/assumptions/resources/fetch-and-post-result.html


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<script>
  window.addEventListener("message", function (event) {
    fetch(event.data)
      .then(response => {
        parent.postMessage(`success: status = ${response.status}`, "*");
      })
      .catch(error => {
        parent.postMessage(`failure: error = ${error.name}`, "*")
      });
  });
</script>