Source code
Revision control
Copy as Markdown
Other Tools
Test Info: Warnings
- 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/softnav-after-lcp-paint-larger-than-viewport.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="/soft-navigation-heuristics/resources/soft-navigation-helper.js"></script>
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
</head>
<body>
<main id=main>
<div>
<a id=link><img id="initial_image1" src="/images/lcp-256x256.png?1" style="width: 90vw; height: 90vh">
<div id=extra></div>
</a>
</div>
</main>
<script>
(async () => {
const link = document.getElementById("link");
// Inject a second image that takes a large part of the viewport.
await new Promise(resolve => {
requestAnimationFrame(() => requestAnimationFrame(() => {
document.getElementById("extra").innerHTML = `
<div style="position: absolute; bottom: 0; right: 0">
<img id="initial_image2" src="/images/lcp-256x256.png?2" style="width: 90vw;height: 90vh">
</div>`;
resolve();
}));
});
// Wait until the second image is rendered.
await new Promise(resolve => {
requestAnimationFrame(() => requestAnimationFrame(() => {
resolve();
}));
});
testSoftNavigation({
addContent: async () => {
// Remove the initial image, so that the text would be painted on screen.
document.getElementById("initial_image1").remove();
document.getElementById("initial_image2").remove();
let lcp_element_painted;
const lcp_element_paint_promise = new Promise((r) => { lcp_element_painted = r; });
// Add an LCP element, but have it be small enough to not trigger the
// Soft Navigation heuristics.
const p = addTextParagraphToMain(
"Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod",
/*element_timing=*/"lcp");
(new PerformanceObserver(list => {
// Once the first element is fully painted:
lcp_element_painted();
})).observe({type: "element", buffered: true});
await lcp_element_paint_promise;
// Add a smaller element that gets us over that threshold.
addTextParagraphToMain("dolore magna aliqua.");
},
link: link,
test: "Test that an image LCP followed by a smaller soft navigation LCP"
+ " properly queues an LCP entry, even when the soft navigation is"
+ " detected after the LCP, even when initial paints significantly"
+ " exceed the viewport dimensions."});
})();
</script>
</body>
</html>