image-load-in-pagehide-handler.html

<!DOCTYPE html>
<html>

<head>
  <title>Image load in pagehide handler</title>
  <script>
    // We need to ensure that other instances of this test running in parallel
    // (e.g. in a virtual suite) do not interfere.
    const key = `${Date.now()}-${Math.random()}`;

    if (window.testRunner) {
      testRunner.dumpAsText();
      testRunner.waitUntilDone();
    }

    async function test() {

      const response = await fetch(`resources/delete-ping.php?test=pagehide-image-${key}`);
      if (response.ok) {
        // We can't go to check-ping.php directly, since that doesn't start sending
        // a response until the ping data is detected, but pagehide handlers (where
        // we send the ping) are only run once we've begun receiving data from the
        // page being navigated to. Instead, we go through a dummy redirect page,
        // to make sure that the onpagehide handler has run before we get to
        // check-ping.php.
        location.assign(`resources/ping-redirect.html?test=pagehide-image-${key}`);
      }
    }

    function ping() {
      var img = new Image(1, 1);
      img.src = `resources/save-Ping.php?test=pagehide-image-${key}`
    }

  </script>
</head>

<body onload="test();" onpagehide="ping();">
  Test case for https://bugs.webkit.org/show_bug.cgi?id=30457. Previously, if an image<br>
  load was trigger from an pagehide handler, we would kill it almost immediately due to the<br>
  navigation stopping all loaders. These loads now happen entirely in the background and detached<br>
  from the DOM, so they're invisible to the normal resource load callback infrastructure. We generate a<br>
  timestamp, then in the pagehide handler, we load an 'image' (actually a php script) that takes the<br>
  timestamp as a parameter and saves it to a file. The destination page is a php script that checks for<br>
  the existence of that file and passes the test if the file contains the expected timestamp.<br>
</body>

</html>
chromium/third_party/blink/web_tests/http/tests/navigation/image-load-in-pagehide-handler.html
