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chromium/third_party/blink/web_tests/external/wpt/html/browsers/history/the-location-interface/location-valueof.html 

<!DOCTYPE html>
<title>Location valueOf</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<div id=log></div>
<script>
test(() => {
  assert_equals(location.valueOf, Object.prototype.valueOf)
  assert_equals(typeof location.valueOf.call(5), "object")
  const prop = Object.getOwnPropertyDescriptor(location, "valueOf")
  assert_false(prop.enumerable)
  assert_false(prop.writable)
  assert_false(prop.configurable)
})
</script>