<!DOCTYPE HTML>
<html>
<head>
  <meta charset=utf-8>
  <title>Largest Contentful Paint: observe image.</title>
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
  <script src="../resources/largest-contentful-paint-helpers.js"></script>
</head>
<body>
  <script>
    promise_test(async () => {
      assert_implements(window.LargestContentfulPaint,
                        "LargestContentfulPaint is not implemented");
      const beforeLoad = performance.now();
      // 262 is the size of the animated PNG up until the first frame,
      // including the chunk that starts the second frame (indicating that
      //the first frame data is done).
      const url = window.location.origin + '/images/blue.png';
      const entry = await load_and_observe(url);
      // blue.png is 133 by 106.
      const size = 133 * 106;
      checkImage(entry, url, 'image_id', size, beforeLoad, ["animated-zero"]);
    }, "Same origin animated image is observable and has a first frame.");
  </script>
</body>
</html>
