chromium/third_party/blink/web_tests/external/wpt/workers/multi-globals/url-parsing.html

<!DOCTYPE html>
<meta charset=utf-8>
<title>Multiple globals for Worker constructor: parsing scriptURL</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<!-- This is the entry global -->

<iframe src="incumbent/incumbent.html"></iframe>

<script>
async_test((t) => {
  onload = t.step_func(() => {
    frames[0].hello();
  });
  onmessage = t.step_func_done(e => {
    assert_equals(e.data, 'current');
  });
});
</script>