initiators-iframe-location-href.sub.https.html

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This WPT test may be referenced by the following Test IDs:
- /speculation-rules/prefetch/initiators-iframe-location-href.sub.https.html?cross-site - WPT Dashboard Interop Dashboard
- /speculation-rules/prefetch/initiators-iframe-location-href.sub.https.html?same-site - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta name="timeout" content="long">

<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="?cross-site">

<meta name="variant" content="?same-site">

<script>

  setup(() => assertSpeculationRulesIsSupported());

  // In https://html.spec.whatwg.org/multipage/browsing-the-web.html#navigate,

  // `sourceDocument` (instead of `navigable`'s active document) should be

  // used as the referring document for prefetch.

//

  // Nonetheless, a prefetch in a top-level window is not suitable to use in an iframe.

  // In particular, browsers partition storage and cache by top-level site.

  // If a browser does start allowing these in narrower cases where the partition

  // would nonetheless be the same, this test might need tweaking.

  promise_test(async t => {

    const win = await spawnWindow(t, { protocol: 'https' });

    const hostname =

      location.search === '?cross-site' ? '{{hosts[alt][www]}}' : undefined;

    const nextUrl = win.getExecutorURL({ protocol: 'https', hostname, page: 2 });

    await win.forceSinglePrefetch(nextUrl);

    // In https://html.spec.whatwg.org/multipage/browsing-the-web.html#navigate,

    // `sourceDocument` is the incumbent Document and thus `win`'s Document.

    // `navigable`'s active document is `iframe`'s Document.

    await win.execute_script((url) => {

      window.executor.suspend(() => {

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

        document.body.appendChild(iframe);

        iframe.contentWindow.location.href = url;

});

    }, [nextUrl]);

    // Below, the scripts given to `win.execute_script()` are executed on the

    // `nextUrl` page in the iframe, because `window.executor.suspend()` above

    // made `win`'s original page stop processing `execute_script()`,

    // while the new page of `nextUrl` in the iframe starts processing

    // `execute_script()` for the same ID.

    assert_equals(

        await win.execute_script(() => location.href),

        nextUrl.toString(),

        "expected navigation to reach destination URL");

    assert_not_prefetched(await win.getRequestHeaders());

  }, `location.href across iframe`);

</script>