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chromium/third_party/blink/web_tests/external/wpt/workers/interfaces/WorkerGlobalScope/onerror/propagate-to-window-onerror.html 

<!doctype html>
<title>onerror, "not handled" with only window.onerror defined</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
setup({
  allow_uncaught_exception: true,
});
async_test(function() {
  var worker = new Worker('propagate-to-window-onerror.js');
  window.onerror = this.step_func(function(a, b, c, d) {
    assert_equals(typeof a, 'string', 'first argument');
    assert_equals(b, document.URL.replace('.html', '.js'), 'second argument');
    assert_equals(typeof c, 'number', 'third argument');
    assert_equals(typeof d, 'number', 'fourth argument');
    this.done();
    return true; // "handled"
  });
});
</script>