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chromium/third_party/blink/web_tests/external/wpt/svg/struct/scripted/use-external-reload-in-iframe.html 

<!DOCTYPE html>
<title>&lt;use> with external resource in reloaded iframe</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<iframe src="support/use-external-reload-in-iframe-child.html"></iframe>
<script>
  async_test(t => {
    window.onload = t.step_func(() => {
      const iframe = document.querySelector('iframe');
      iframe.onload = t.step_func_done();
      iframe.contentWindow.location.reload();
    });
  });
</script>