navigation-timing-sizes.https.html

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This WPT test may be referenced by the following Test IDs:
- /speculation-rules/prefetch/navigation-timing-sizes.https.html?bypass_cache=true - WPT Dashboard Interop Dashboard
- /speculation-rules/prefetch/navigation-timing-sizes.https.html?default - WPT Dashboard Interop Dashboard
- /speculation-rules/prefetch/navigation-timing-sizes.https.html?prefetch=true - WPT Dashboard Interop Dashboard
- /speculation-rules/prefetch/navigation-timing-sizes.https.html?prefetch=true&bypass_cache=true - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

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

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

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

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

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

<script src="resources/utils.sub.js"></script>

<meta name="variant" content="?default">

<meta name="variant" content="?bypass_cache=true">

<meta name="variant" content="?prefetch=true">

<meta name="variant" content="?prefetch=true&bypass_cache=true">

<script>

setup(() => assertSpeculationRulesIsSupported());

const searchParams = new URLSearchParams(location.search);

const prefetchEnabled = searchParams.has('prefetch');

const bypassCache = searchParams.has('bypass_cache');

// Header size: https://w3c.github.io/resource-timing/#dom-performanceresourcetiming-transfersize

const headerSize = 300;

promise_test(async t => {

    const agent = await spawnWindow(t);

    // Some meaningless query param to avoid cached response.

    const prefetchUrl =

      bypassCache ? agent.getExecutorURL({ a: "b" }) : agent.getExecutorURL();

    if (prefetchEnabled)

      await agent.forceSinglePrefetch(prefetchUrl);

    await agent.navigate(prefetchUrl);

    if (prefetchEnabled)

      assert_prefetched(await agent.getRequestHeaders(),

        `Prefetch ${prefetchUrl.href} should work.`);

    else

      assert_not_prefetched(await agent.getRequestHeaders(),

        `${prefetchUrl.href} should not be prefetched.`);

    await agent.execute_script(

      () => window.entries = performance.getEntriesByType('navigation'));

    // TODO(crbug/1317756): Currently the initial prefetch request bypasses the

    // HTTP cache. Expand test coverage for cache and cache+revalidation cases.

//

    // We do not assert the exact size of `resources/executor.sub.html` since it

    // would be a headache to update this test everytime executor.sub.html

    // changes.

    assert_equals(await agent.execute_script(() => window.entries.length), 1,

      'Wrong number of entries');

    const entry =

      await agent.execute_script(() => window.entries[0]);

    const bodySize = entry.encodedBodySize;

    assert_greater_than(bodySize, 0);

    assert_equals(entry.transferSize, headerSize + bodySize);

    assert_equals(entry.decodedBodySize, bodySize);

  }, `PerformanceNavigationTiming.transferSize/encodedBodySize/decodedBodySize test, same origin prefetch.`);

</script>