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chromium/third_party/blink/web_tests/external/wpt/navigation-api/navigation-history-entry/opaque-origin.html 

<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<iframe id="i" sandbox="allow-scripts" src="resources/opaque-origin-page.html"></iframe>

<script>
fetch_tests_from_window(i.contentWindow);
</script>