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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
| commit | 26a029d407be480d791972afb5975cf62c9360a6 (patch) | |
| tree | f435a8308119effd964b339f76abb83a57c29483 /testing/web-platform/tests/largest-contentful-paint/image-not-fully-visible.html | |
| parent | Initial commit. (diff) | |
| download | firefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz firefox-26a029d407be480d791972afb5975cf62c9360a6.zip | |
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'testing/web-platform/tests/largest-contentful-paint/image-not-fully-visible.html')
| -rw-r--r-- | testing/web-platform/tests/largest-contentful-paint/image-not-fully-visible.html | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/testing/web-platform/tests/largest-contentful-paint/image-not-fully-visible.html b/testing/web-platform/tests/largest-contentful-paint/image-not-fully-visible.html new file mode 100644 index 0000000000..d66dc4a520 --- /dev/null +++ b/testing/web-platform/tests/largest-contentful-paint/image-not-fully-visible.html @@ -0,0 +1,56 @@ +<!DOCTYPE HTML> +<meta charset=utf-8> +<meta name="viewport" content="width=device-width, minimum-scale=1"> +<title>Largest Contentful Paint: size when image overflows</title> +<body> +<style> +body { + /* Preventing a scrollbar from showing and removing any margins simplifies + the calculations below. */ + overflow: hidden; + margin: 0px; +} +</style> +<script src="/resources/testharness.js"></script> +<script src="/resources/testharnessreport.js"></script> +<script src="resources/largest-contentful-paint-helpers.js"></script> +<script> + setup({"hide_test_state": true}); + let beforeRender; + const viewportWidth = document.documentElement.clientWidth; + const viewportHeight = document.documentElement.clientHeight; + const imgWidth = 100; + const imgHeight = 50; + async_test(function (t) { + assert_implements(window.LargestContentfulPaint, "LargestContentfulPaint is not implemented"); + const beforeLoad = performance.now(); + new PerformanceObserver( + t.step_func_done(function(entryList) { + assert_equals(entryList.getEntries().length, 1); + const entry = entryList.getEntries()[0]; + const url = window.location.origin + '/images/lcp-100x50.png'; + // To compute the size, compute the percentage of the image visible and + // scale by its natural dimensions. In this test, the image is expanded to twice its size + // but place towards the bottom right corner of the viewport, so it is + // effectively clipped to 50% by 50% of its display size. Scaling by + // its natural width and height of 100px and 50px respectively, leads + // to a weighted size of 50 by 25. + const truncatedWidth = imgWidth / 2; + const truncatedHeight = imgHeight / 2; + const weightedSize = truncatedWidth * truncatedHeight; + checkImage(entry, url, 'image_id', weightedSize, beforeLoad); + }) + ).observe({type: 'largest-contentful-paint', buffered: true}); + // Add an image, setting width and height equal to viewport. + img = document.createElement('img'); + img.src = '/images/lcp-100x50.png'; + img.id = 'image_id'; + img.width = imgWidth * 2; + img.height = imgHeight * 2; + img.style.position = 'absolute'; + img.style.left = viewportWidth - imgWidth + 'px'; + img.style.top = viewportHeight - imgHeight + 'px'; + document.body.appendChild(img); + }, 'The intersectionRect of an img element overflowing is computed correctly'); +</script> +</body> |