File: file_test_background_loading_iframes.html

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<html>
  <body>
  <script>
    var onloadFiredAt;

    let start = performance.now();
    while (performance.now() - start < 5000);

    window.onload = function() {
      onloadFiredAt = performance.now();
    }

    window.addEventListener('message', function(event) {
      window.parent.postMessage(onloadFiredAt, "*");
    })

  </script>
  </body>
</html>