File: observe-css-generated-image.html

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<!doctype html>
<meta charset=utf-8>
<title>Largest Contentful Paint: observe element with css generated image</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/largest-contentful-paint-helpers.js"></script>
<style>
  #target {
    content: url('/images/lcp-256x256.png');
  }
</style>
<body>
  <script>
  setup({"hide_test_state": true});
  async_test(function (t) {
    assert_implements(window.LargestContentfulPaint, "LargestContentfulPaint is not implemented");

    const beforeLoad = performance.now();

    const observer = new PerformanceObserver(
      t.step_func_done(function(entryList) {
        const entries = entryList.getEntries();
        assert_equals(entries.length, 1);
        const url = window.location.origin + '/images/lcp-256x256.png';
        checkImage(entries[0], url, 'target', 65536, beforeLoad);
    }));
    observer.observe({entryTypes: ['largest-contentful-paint']});
  }, 'Largest Contentful Paint: CSS generated image is observable.');
  </script>
  <div id="target"></div>
</body>