multiple-paint-entries-buffered.tentative.html

<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<meta name="timeout" content="long">
<title>Detect multiple soft navigations and ensure they buffer paint entries.</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();
      },
      link: link,
      clicks: 4,
      extraValidations: async (entries, options)=>{
        if (!performance.softNavPaintMetricsSupported) {
          return;
        }
        const paint_entries = await new Promise(resolve => {
          new PerformanceObserver(list => resolve(list.getEntries())).observe(
            {type: 'paint', buffered: true,
             includeSoftNavigationObservations: true});
          });
        assert_equals(paint_entries.length, 10);
      },
      test: "Test that multiple soft navigation buffer paint entries"});
  </script>
</body>
</html>

chromium/third_party/blink/web_tests/external/wpt/soft-navigation-heuristics/multiple-paint-entries-buffered.tentative.html