<!DOCTYPE html>
<head>
    <meta charset='utf-8' />
    <script src="/resources/testharness.js"></script>
    <script src='/resources/testharnessreport.js'></script>
    <script>
      setup({explicit_done: true})
      window.addEventListener('load', function(){
        assert_not_equals(typeof performance.getEntriesByType('navigation')[0].serverTiming, 'undefined',
          'An instance of `PerformanceNavigationTiming` should have a `serverTiming` attribute.')
        done()
      })
    </script>
</head>