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chromium/third_party/blink/web_tests/external/wpt/navigation-api/navigation-methods/navigate-relative-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(() => {
    i.contentWindow.navigation.navigate("?1");
    i.onload = t.step_func_done(() => {
      let iframe_url = new URL(i.contentWindow.navigation.currentEntry.url);
      assert_equals(iframe_url.search, "?1");
      assert_equals(iframe_url.pathname, "/common/blank.html");
    });
  });
}, "navigate() should resolve urls relative to navigation object, not the caller");
</script>