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

<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<iframe id="i" src="/common/blank.html"></iframe>
<script>
async_test(t => {
  window.onload = t.step_func(() => {
    window.onmessage = t.step_func_done(e => {
      assert_equals(e.data.length, 0);
      assert_true(e.data.currentIsNull);
    });
    i.src = "data:text/html,<script>top.postMessage({ length: navigation.entries().length, " +
        "currentIsNull: navigation.currentEntry === null}, '*')</sc" +
        "ript>";
  });
}, "entries() and currentEntry after navigation to a data: URL (which has an opaque origin)");
</script>