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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 09:22:09 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 09:22:09 +0000 |
| commit | 43a97878ce14b72f0981164f87f2e35e14151312 (patch) | |
| tree | 620249daf56c0258faa40cbdcf9cfba06de2a846 /testing/web-platform/tests/largest-contentful-paint/larger-image.html | |
| parent | Initial commit. (diff) | |
| download | firefox-43a97878ce14b72f0981164f87f2e35e14151312.tar.xz firefox-43a97878ce14b72f0981164f87f2e35e14151312.zip | |
Adding upstream version 110.0.1.upstream/110.0.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'testing/web-platform/tests/largest-contentful-paint/larger-image.html')
| -rw-r--r-- | testing/web-platform/tests/largest-contentful-paint/larger-image.html | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/testing/web-platform/tests/largest-contentful-paint/larger-image.html b/testing/web-platform/tests/largest-contentful-paint/larger-image.html new file mode 100644 index 0000000000..948f00d0c6 --- /dev/null +++ b/testing/web-platform/tests/largest-contentful-paint/larger-image.html @@ -0,0 +1,58 @@ +<!DOCTYPE HTML> +<meta charset=utf-8> +<title>Largest Contentful Paint: largest image is reported.</title> + +<body> + <script src="/resources/testharness.js"></script> + <script src="/resources/testharnessreport.js"></script> + <script src="resources/largest-contentful-paint-helpers.js"></script> + <!-- There is some text and some images. We care about blue.png being reported, as it is the largest. --> + <p>This is some text! :)</p> + <img src='' id='red' /> + <img src='' id='blue' /> + <img src='' id='black' /> + <p>More text!</p> + <script> + // Add listener for load event that is fired when image is loaded. + function image_load_promise(image_element) { + return new Promise(resolve => { + image_element.addEventListener('load', resolve); + }); + } + + promise_test(async (t) => { + assert_implements(window.LargestContentfulPaint, "LargestContentfulPaint is not implemented"); + + let promise = image_load_promise(document.getElementById('red')); + document.getElementById('red').src = '/images/red.png'; + await promise; + + const beforeLoad = performance.now(); + + promise = image_load_promise(document.getElementById('blue')); + document.getElementById('blue').src = '/images/blue.png'; + await promise; + + promise = image_load_promise(document.getElementById('black')); + document.getElementById('black').src = '/images/black-rectangle.png'; + await promise; + + const observer = new PerformanceObserver( + t.step_func(entryList => { + entryList.getEntries().forEach(entry => { + // The text or other image could be reported as LCP if it is rendered before the blue image. + if (entry.id !== 'blue') + return; + + const url = window.location.origin + '/images/blue.png'; + // blue.png is 133 by 106. + const size = 133 * 106; + checkImage(entry, url, 'blue', size, beforeLoad); + t.done(); + }) + }) + ); + observer.observe({ type: 'largest-contentful-paint', buffered: true }); + }, 'Largest Contentful Paint: largest image is reported.'); + </script> +</body> |