testing/web-platform/tests/service-workers/service-worker/resources/fetch-request-fallback-iframe.html


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<script>
function xhr(url) {
  return new Promise(function(resolve, reject) {
      var request = new XMLHttpRequest();
      request.addEventListener(
        'error',
        function(event) { reject(event); });
      request.addEventListener(
        'load',
        function(event) { resolve(request.response); });
      request.open('GET', url);
      request.send();
    });
}
</script>