navigation-api-view-transition.tentative.html

<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>Navigation API + ViewTransition trigger a 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>
    <div>
      <a id=link href="foobar.html">Click me!</a>
    </div>
  </main>
  <script>
    let key;
    window.onload = async () => {
      // Wait for after the load event so that the navigation doesn't get
      // converted into a replace navigation.
      await new Promise(r => step_timeout(r, 0));

      const navigate_callback = e => {
        e.intercept({
          async handler() {
            const lcp_promise = new Promise(resolve => {
             (new PerformanceObserver(list => resolve())).observe(
               {type: 'largest-contentful-paint',
                includeSoftNavigationObservations: true});
             });
            const transition = document.startViewTransition(async () => {
              const main = document.getElementById('main');
              main.innerHTML = '<img id="image" src="/images/blue.png?' +
                Math.random() + '">';
              const img = document.getElementById("image");
            });
            await transition.updateCallbackDone;
            await lcp_promise;
          }
        });
        timestamps[counter]["eventEnd"] = performance.now();
      };

      const link = document.getElementById("link");
      testNavigationApi("Navigation API interception handler + " +
                        "startViewTransition properly detects soft navigations",
                        navigate_callback, link);
    };
  </script>
</body>
</html>
chromium/third_party/blink/web_tests/external/wpt/soft-navigation-heuristics/navigation-api-view-transition.tentative.html
