anchor-download-aborts-previous-navigation.html

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This WPT test may be referenced by the following Test IDs:
- /navigation-api/ordering-and-transition/anchor-download-aborts-previous-navigation.html - WPT Dashboard Interop Dashboard

<!doctype html>

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

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

<iframe id="iframe" src="/common/blank.html"></iframe>

<script>

  promise_test(async t => {

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

    await new Promise(resolve => window.onload = resolve);

    const navigate_called = Promise.withResolvers();

    const { navigation } = iframe.contentWindow;

    navigation.addEventListener("navigate", e => {

      if (!e.downloadRequest) {

        e.intercept({ handler: () => new Promise(resolve => { }) });

        navigate_called.resolve();

});

    navigation.navigate("?never");

    await navigate_called.promise;

    const events = [];

    const { transition } = navigation;

    transition.committed.then(() => events.push("committed")).catch(e => events.push("commit-rejected"));

    transition.finished.then(() => events.push("finished")).catch(e => events.push("finish-rejected"));

    navigation.onnavigatesuccess = () => events.push("navigatesuccess");

    navigation.onnavigateerror = () => events.push("navigateerror");

    await Promise.resolve();

    let a = iframe.contentDocument.createElement("a");

    a.href = "?download";

    a.download = "";

    iframe.contentDocument.body.appendChild(a);

    a.click();

    await Promise.allSettled([transition.finished, transition.committed])

    assert_array_equals(events, ["committed", "navigateerror", "finish-rejected"]);

  }, "<a download> aborts previous navigations");

</script>