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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/layout-instability/shift-while-scrolled.html | |
| parent | Initial commit. (diff) | |
| download | firefox-upstream.tar.xz firefox-upstream.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/layout-instability/shift-while-scrolled.html')
| -rw-r--r-- | testing/web-platform/tests/layout-instability/shift-while-scrolled.html | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/testing/web-platform/tests/layout-instability/shift-while-scrolled.html b/testing/web-platform/tests/layout-instability/shift-while-scrolled.html new file mode 100644 index 0000000000..822aa94cff --- /dev/null +++ b/testing/web-platform/tests/layout-instability/shift-while-scrolled.html @@ -0,0 +1,37 @@ +<!DOCTYPE html> +<title>Layout Instability: shift while scrolled</title> +<link rel="help" href="https://wicg.github.io/layout-instability/" /> +<style> + +body { height: 2000px; margin: 0; } +#shift { position: relative; width: 300px; height: 200px; background: blue; } + +</style> +<div id="shift"></div> +<script src="/resources/testharness.js"></script> +<script src="/resources/testharnessreport.js"></script> +<script src="resources/util.js"></script> +<script> + +promise_test(async () => { + const watcher = new ScoreWatcher; + + // Wait for the initial render to complete. + await waitForAnimationFrames(2); + + // Scroll down by 100px. + document.scrollingElement.scrollTop = 100; + assert_equals(watcher.score, 0); + + // Generate a layout shift. + document.querySelector("#shift").style = "top: 60px"; + + // Impact region: width * (height - scrollTop + moveDistance) + const expectedScore = computeExpectedScore( + 300 * (200 - 100 + 60), 60); + + await watcher.promise; + assert_equals(watcher.score, expectedScore); +}, 'Layout shift with non-zero scroll offset.'); + +</script> |