iframe-inheritance-history-about-blank.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /referrer-policy/generic/inheritance/iframe-inheritance-history-about-blank.html - WPT Dashboard Interop Dashboard

<!doctype html>

<title>Referrer Policy: navigating back to an about:blank iframe reuses the original referrer policy</title>

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

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

<meta name="referrer" content="no-referrer">

<div id="log"></div>

<script>

  let checkReferrer = document => {

    let script = document.createElement('script');

    script.innerText = `

      fetch("${origin}/common/security-features/subresource/xhr.py",

            {referrer: "${location.origin}/custom"})

        .then(r => r.json())

        .then(j => {

          top.postMessage({referrer: j.headers.referer}, "*")

        }).catch(e => {

          top.postMessage({referrer: "FAILURE"}, "*");

});

    let referrer = new Promise(resolve => {

      window.addEventListener("message", function listener(msg) {

        window.removeEventListener("message", listener, false);

        resolve(msg.data.referrer);

});

});

    document.body.appendChild(script);

    return referrer;

};

  let iframeLoaded = iframe => {

    return new Promise(resolve => {

      iframe.onload = resolve;

});

};

  promise_test(async t => {

    // 1. Create an iframe and navigate it to about:blank.

    // (We cannot just create an empty iframe since the initial empty

    // document will get its history entry replaced, so we cannot

    // navigate back to it.)

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

    iframe.name = 'test_frame';

    iframe.src = "/referrer-policy";

    document.body.appendChild(iframe);

    await iframeLoaded(iframe);

    window.open('about:blank', 'test_frame');

    await iframeLoaded(iframe);

    let referrer_1 = await checkReferrer(iframe.contentDocument);

    assert_equals(referrer_1, undefined,

                  "First navigation uses correct policy.");

    // 2. Change the referrer policy of the iframe.

    let meta = iframe.contentDocument.createElement('meta');

    meta.name = 'referrer';

    meta.content = "unsafe-url";

    iframe.contentDocument.head.appendChild(meta);

    let referrer_2 = await checkReferrer(iframe.contentDocument);

    assert_equals(referrer_2, location.origin + '/custom',

                  "Referrer policy correctly changed.");

    // 3. Navigate the iframe elsewhere.

    window.open('/referrer-policy', 'test_frame');

    await iframeLoaded(iframe);

    // 4. Navigate the iframe back.

    iframe.contentWindow.history.back();

    await iframeLoaded(iframe);

    let referrer_3 = await checkReferrer(iframe.contentDocument);

    assert_equals(referrer_3, undefined,

                  "History navigation reuses original policy.");

    document.body.removeChild(iframe);

  }, "History navigation reuses original policy.");

</script>