one-arg.html | Explore in Territory

<!doctype html>
<title>just one argument</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
async_test(t => {
  postMessage('');
  onmessage = t.step_func_done(e => {
    assert_equals(e.data, '');
  });
});
</script>

chromium/third_party/blink/web_tests/external/wpt/webmessaging/with-options/one-arg.html