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chromium/third_party/blink/web_tests/external/wpt/html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-same-origin-fragment.html 

<!DOCTYPE html>
<meta charset="utf-8">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="help" href="https://html.spec.whatwg.org/multipage/browsers.html#navigating-across-documents">
<link rel="author" title="Domenic Denicola" href="mailto:[email protected]">

<iframe id="i" src="navigation-unload-same-origin-fragment-1.html"></iframe>

<!-- a timeout indicates that setting i.contentWindow.location.hash (a second navigation) aborted the first navigation,
    and so it stayed on a.html and finishedLoading was never called -->

<script>
var test = async_test('Tests that a fragment navigation in the unload handler will not block the initial navigation');
window.onload = test.step_func(function() {
    var i = document.querySelector('#i');

    i.contentWindow.onunload = test.step_func(function() {
        i.contentWindow.location.hash = '#fragment';
    });

    window.finishedLoading = test.step_func_done(function () {
        assert_equals(i.contentWindow.location.pathname.split('/').pop(), 'navigation-unload-same-origin-fragment-2.html');
        assert_equals(i.contentWindow.location.hash, '');
    });

    i.contentWindow.location.href = 'navigation-unload-same-origin-fragment-2.html';
});
</script>