<!DOCTYPE HTML>
<meta charset=utf-8>
<title>Largest Contentful Paint:dynamically appended image with different
    dimensions but same src triggers new entry.</title>
<body>
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
  <script src="resources/largest-contentful-paint-helpers.js"></script>
  <img src='/images/black-rectangle.png' id='image_id' width="50" />
  <script>
    async_test(function (t) {
      assert_implements(window.LargestContentf