52 lines
2 KiB
HTML
52 lines
2 KiB
HTML
<!DOCTYPE HTML>
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<html>
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<head>
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<meta charset="utf-8">
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<title>Detect simple soft navigation.</title>
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="/resources/testdriver.js"></script>
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<script src="/resources/testdriver-vendor.js"></script>
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<script src="resources/soft-navigation-helper.js"></script>
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<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
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</head>
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<body>
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<main id=main>
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<div>
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<a id=link><img src="/images/lcp-256x256.png"></a>
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</div>
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</main>
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<script>
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const link = document.getElementById("link");
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testSoftNavigation({
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addContent: async () => {
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// Add an LCP element, large enough to trigger the Soft Navigation
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// heuristics.
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const p = addTextParagraphToMain("Lorem Ipsum", /*element_timing=*/"lcp");
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p.id = "first_lcp";
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// Once the first element is fully painted.
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const observer = new PerformanceObserver(list => {
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// Add a larger element to be the new LCP.
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window.lcp_observer_promise = new Promise(resolve => {
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(new PerformanceObserver(resolve)).observe({type: "element"});
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});
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const p2 = addTextParagraphToMain("LOREM IPSUMER", "real_lcp");
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p2.id = "real_lcp";
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observer.disconnect();
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});
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observer.observe({type: "element", buffered: true});
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},
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link: link,
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validate: async () => {
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await window.lcp_observer_promise;
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const lcps = await getLcpEntries();
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assert_greater_than_equal(lcps.length, 3, "Got at least 3 LCP entries");
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assert_equals(lcps[lcps.length - 2].id, "first_lcp", "Got the first LCP");
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assert_equals(lcps[lcps.length - 1].id, "real_lcp", "Got the real LCP");
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},
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test: "Test that an image LCP followed by 2 smaller soft navigation LCPs"
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+ " properly queues both LCP entries, even when the soft navigation"
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+ " is detected in between them."});
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</script>
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</body>
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</html>
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