image-lcp-before-detection-second-softnav.tentative.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /soft-navigation-heuristics/image-lcp-before-detection-second-softnav.tentative.html - WPT Dashboard Interop Dashboard

<!DOCTYPE HTML>

<html>

<head>

<meta charset="utf-8">

<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><img src="/images/lcp-256x256.png" id="img"></a>

    </div>

  </main>

  <script>

    const link = document.getElementById("link");

    let first_lcp_painted;

    let second_lcp_painted;

    (async () => {

      await new Promise(r => { first_lcp_painted = r; });

      addImageToMain("lcp-133x106.png", "no_lcp");

      (new PerformanceObserver(second_lcp_painted)).observe({type: "element"});

    })();

    testSoftNavigation({

      pushState: null,

      clicks: 2,

      addContent: async () => {

        // Add an LCP element.

        await new Promise(resolve => {

          addImageToMain("lcp-100x50.png", "first_lcp" + counter);

          (new PerformanceObserver(resolve)).observe({type: "element"});

});

        if(counter) {

          first_lcp_painted();

          // Wait for the unrelated LCP to be painted.

          await new Promise(r => { second_lcp_painted = r; });

        const url = URL + "?" + counter;

        history.pushState({}, '', url);

},

      link: link,

      validate: async () => {

        const lcps = await getLcpEntries();

        const ref_counter = counter-1;

        assert_equals(lcps.length, 2 + ref_counter, "Got 2 LCP entries");

        assert_equals(lcps[lcps.length - 1].id, "first_lcp" + ref_counter,

                      "Got the first LCP");

},

      test: "Second soft navigation image LCP discovered between user " +

            "interaction and soft navigation detection are properly " +

            "reported, while unrelated LCPs are ignored during that time. " +

            "As a side effect, we also test element timing."});

  </script>

</body>

</html>