toJSON.html - mozsearch

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This WPT test may be referenced by the following Test IDs:
- /largest-contentful-paint/toJSON.html - WPT Dashboard Interop Dashboard

<!DOCTYPE HTML>

<meta charset=utf-8>

<title>Largest Contentful Paint: toJSON</title>

<body>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<p>Text!</p>

<script>

  async_test(function (t) {

    assert_implements(window.LargestContentfulPaint, "LargestContentfulPaint is not implemented");

    const observer = new PerformanceObserver(

      t.step_func_done(function(entryList) {

        const entry = entryList.getEntries()[0];

        assert_equals(typeof(entry.toJSON), 'function');

        const json = entry.toJSON();

        assert_equals(typeof(json), 'object');

        const keys = [

          // PerformanceEntry

          'name',

          'entryType',

          'startTime',

          'duration',

          // LargestContentfulPaint

          'renderTime',

          'loadTime',

          'size',

          'id',

          'url',

];

        for (const key of keys) {

          assert_equals(json[key], entry[key],

            'LargestContentfulPaint ${key} entry does not match its toJSON value');

        assert_equals(json['element'], undefined, 'toJSON should not include element');

})

);

    observer.observe({type: 'largest-contentful-paint', buffered: true});

  }, 'Test toJSON() in LargestContentfulPaint.');

</script>

</body>