File: dropped-entries.tentative.html

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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<meta name="timeout" content="long">
<title>Detect simple soft navigation.</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="resources/soft-navigation-helper.js"></script>
</head>
<body>
  <main id=main>
  <a id=link>Click me!</a>
  </main>
  <script>
    const link = document.getElementById("link");

    testSoftNavigation({
      addContent: async () => {
        await addImageToMain('green-16x16.png');
      },
      link: link,
      clicks: 52,
      extraValidations: async (entries, options)=>{
        if (!performance.softNavPaintMetricsSupported) {
          return;
        }
        const [paint_entries, paint_options] = await new Promise(resolve => {
          new PerformanceObserver((list, obs, options) =>
            resolve([list.getEntries(), options])).observe(
            {type: 'paint', buffered: true});
          });
        assert_equals(options['droppedEntriesCount'], 2);
        assert_equals(paint_options['droppedEntriesCount'], 4);
      },
      test: "Test that a soft navigation entries get dropped when buffer limits"
        + " get exceeded."});
  </script>
</body>
</html>