prefetch-transfer-size-executor.html

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This WPT test may be referenced by the following Test IDs:
- /navigation-timing/prefetch-transfer-size-executor.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

<head>

  <title>Navigation Timing Transfert Size of Prefetched Page</title>

  <script src="/resources/testharness.js"></script>

  <script src="/resources/testharnessreport.js"></script>

  <script src="/common/utils.js"></script>

  <script src="/common/dispatcher/dispatcher.js"></script>

</head>

<!--

  This test uses RemoteContext and Executor to execute JavaScript in another

  page opened by this test page. This is because we need to simulate

  navigating away from current page in this test. It will cause all Javascript

  code on the test page to be lost if we do it in the test page. We can't do it

  in an iframe because currently the prefetch behaves differently in an iframe

  in this particular test case. For detailed information about RemoteContext and

  Executor, see /common/dispatcher/README.md.

-->

<body>

  <script>

    const addLink = (url) => {

      return new Promise(resolve => {

        const link = document.createElement('link');

        link.onload = function () { resolve(); };

        link.rel = 'prefetch';

        link.as = 'document';

        link.href = url;

        document.body.appendChild(link);

});

    const navigateToPrefetchedUrl = (url) => {

      document.location.href = url;

    const getTransferSize = () => window.performance.getEntriesByType('navigation')[0].transferSize;

    promise_test(async t => {

      const testPage = new RemoteContext(token());

      // Function remoteExecutorUrl is defined in /common/dispatcher/dispatcher.js

      const url = remoteExecutorUrl(testPage.context_id);

      const handler = window.open(url);

      t.add_cleanup(() => handler.close());

      const prefetchedPage = new RemoteContext(token());

      const url_to_prefetch = '/navigation-timing/resources/blank_page_prefetch.html?uuid='

        + prefetchedPage.context_id;

      // Prefetch link.

      await testPage.execute_script(addLink, [url_to_prefetch]);

      // Navigate to the prefetched link.

      await testPage.execute_script(navigateToPrefetchedUrl, [url_to_prefetch]);

      // Get navigation timing transfer size.

      const size = await prefetchedPage.execute_script(getTransferSize);

      assert_equals(0, size);

    }, "Navigation timing transfer size for a prefetched navigation should be 0.");

  </script>

</body>

</html>