iframe-inheritance-history-about-srcdoc.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-srcdoc.html - WPT Dashboard Interop Dashboard

<!doctype html>

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

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

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

<script src="/common/get-host-info.sub.js"></script>

<script src="resources/make-html-script.js"></script>

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

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

<script>

  let reportedReferrer = () => {

    return new Promise(resolve => {

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

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

        resolve(msg.data.referrer);

});

});

};

  let iframeLoaded = iframe => {

    return new Promise(resolve => {

      iframe.onload = resolve;

});

};

  promise_test(async t => {

    // 1. Create an about:srcdoc iframe.

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

    iframe.name = 'test_frame';

    let iframe_load_1 = iframeLoaded(iframe);

    let referrer_1 = reportedReferrer();

    iframe.srcdoc = createScriptString(get_host_info().REMOTE_ORIGIN,

                                       location.origin + "/custom");

    document.body.appendChild(iframe);

    await iframe_load_1;

    let referrer_1_result = await referrer_1;

    // 2. Change the referrer policy of the main document.

    document.getElementsByTagName('meta')[0].content = "unsafe-url";

    // 3. Navigate the iframe elsewhere.

    let iframe_load_2 = iframeLoaded(iframe);

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

    await iframe_load_2;

    // 4. Navigate the iframe back.

    let iframe_load_3 = iframeLoaded(iframe);

    let referrer_2 = reportedReferrer();

    iframe.contentWindow.history.back();

    await iframe_load_3;

    // Despite the main document has changed its referrer policy in (2), the

    // reported referrer for the history navigation to about:srcdoc in (4) must

    // match with the one originally reported in (1).

    assert_equals(referrer_1_result, undefined,

                  "First navigation uses correct policy.");

    assert_equals(await referrer_2, undefined,

                  "History navigation reuses original policy.");

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

  promise_test(async t => {

    // If we initiate a new about:srcdoc navigation, the new referrer policy

    // should apply.

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

    let new_iframe_load = iframeLoaded(new_iframe);

    let new_iframe_referrer = reportedReferrer();

    new_iframe.srcdoc = createScriptString(get_host_info().REMOTE_ORIGIN,

                                           location.origin + "/custom");

    document.body.appendChild(new_iframe);

    await new_iframe_load;

    assert_equals(await new_iframe_referrer, self.origin + '/custom');

  }, "New srcdoc iframe uses new policy.");

</script>