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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 01:47:29 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 01:47:29 +0000 |
| commit | 0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d (patch) | |
| tree | a31f07c9bcca9d56ce61e9a1ffd30ef350d513aa /testing/web-platform/tests/largest-contentful-paint/initially-invisible-images.html | |
| parent | Initial commit. (diff) | |
| download | firefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.tar.xz firefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.zip | |
Adding upstream version 115.8.0esr.upstream/115.8.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'testing/web-platform/tests/largest-contentful-paint/initially-invisible-images.html')
| -rw-r--r-- | testing/web-platform/tests/largest-contentful-paint/initially-invisible-images.html | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/testing/web-platform/tests/largest-contentful-paint/initially-invisible-images.html b/testing/web-platform/tests/largest-contentful-paint/initially-invisible-images.html new file mode 100644 index 0000000000..b4d68a5cb9 --- /dev/null +++ b/testing/web-platform/tests/largest-contentful-paint/initially-invisible-images.html @@ -0,0 +1,63 @@ +<!DOCTYPE HTML> +<head> +<title>Largest Contentful Paint: initially out-of-viewport image gets an LCP entry once they are visible.</title> +<script src="/resources/testharness.js"></script> +<script src="/resources/testharnessreport.js"></script> +<style> + .flex-container { + display: flex; + flex-direction: row; + width: 1000px; + overflow-x: hidden; + scroll-behavior: auto; + } +</style> +</head> +<body> +<div> +<div class='flex-container' id="container"> + <img src='/images/yellow.png?pipe=trickle(d1)' width="1000" height="1000"/> + <img src='/images/green-1x1.png?1' width="1000" height="1000"/> + <img src='/images/green-1x1.png?2' width="1000" height="1000"/> + <img src='/images/green-1x1.png?3' width="1000" height="1000"/> +</div> +</div> +<script> +// Spin the carousel +setup({"hide_test_state": true}); +const images = document.querySelectorAll('img'); + +let selected = 0; +const container = document.getElementById("container"); +const transition = () => { + container.scrollLeft = selected * 1000; + selected = (selected + 1) % images.length; +} + +container.scrollLeft=1000; +setInterval(transition, 1000); + +promise_test(async t => { + + return new Promise(resolve => { + assert_implements(window.LargestContentfulPaint, + "LargestContentfulPaint is not implemented"); + const observer = new PerformanceObserver(entryList => { + entryList.getEntries().forEach(entry => { + // May receive a text entry. Ignore that entry. + if (!entry.url) { + return; + } + assert_true(entry.url.includes("yellow.png"), "Re-visible image has an entry"); + resolve(); + }); + }); + observer.observe({type: 'largest-contentful-paint', buffered: true}); + t.step_timeout(() => { + assert_unreached("The image should have become visible by now, which should have triggered an LCP entry."); + t.done(); + }, 2000); + }); +}, 'Image visibility: out-of-viewport images are observable by LargestContentfulPaint once they become visible.'); +</script> +</body> |