https-upgrades/tentative/fallback.sub.html

<!DOCTYPE html>
<html>
  <head>
    <title>HTTPS Upgrades: Fallback.</title>
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <script src="/common/get-host-info.sub.js"></script>

  </head>
  <body>
    <script>
      setup({ single_test: true });
      // If HTTPS upgrades are enabled, this will fail to load since this test is http only,
      // and should load properly once a fallback is triggered.
      var url = new URL("http://{{host}}:{{ports[http][0]}}/https-upgrades/resources/pass.html")
      window.onmessage = function(event) {
          if (event.data === "pass") {
              done();
          }
      }
      win = window.open(url)
    </script>
  </body>
</html>