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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/layout-instability/content-visibility-auto-offscreen.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/layout-instability/content-visibility-auto-offscreen.html')
| -rw-r--r-- | testing/web-platform/tests/layout-instability/content-visibility-auto-offscreen.html | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/testing/web-platform/tests/layout-instability/content-visibility-auto-offscreen.html b/testing/web-platform/tests/layout-instability/content-visibility-auto-offscreen.html new file mode 100644 index 0000000000..91dd8348cb --- /dev/null +++ b/testing/web-platform/tests/layout-instability/content-visibility-auto-offscreen.html @@ -0,0 +1,47 @@ +<!DOCTYPE html> +<title>Layout Instability: off-screen content-visibility:auto content</title> +<link rel="help" href="https://wicg.github.io/layout-instability/" /> +<script src="/resources/testharness.js"></script> +<script src="/resources/testharnessreport.js"></script> +<script src="resources/util.js"></script> +<script> +// These scripts need to be before the contents because we need to ensure no +// layout shifts during page load. +promise_test(async () => { + const watcher = new ScoreWatcher; + + // Wait for the initial render to complete. + await waitForAnimationFrames(2); + + window.scrollTo(0, 100000 + 100); + await waitForAnimationFrames(2); + + assert_equals(watcher.score, 0); + + // This should report a layout shift as target is now visible. + target.style.top = '100100px'; + + await watcher.promise; + const expectedScore = computeExpectedScore(100 * 100, 1); + assert_approx_equals(watcher.score, expectedScore, 1e-8, "before scroll to top"); + + // No new layout shift should be reported when target is scrolled out of screen. + window.scrollTo(0, 0); + await waitForAnimationFrames(2); + + assert_approx_equals(watcher.score, expectedScore, 1e-8, "after scroll to top"); +}, 'off-screen content-visibility:auto'); +</script> +<style> + .auto { + content-visibility: auto; + contain-intrinsic-size: 1px; + width: 100px; + } +</style> +<div class=auto> + <div style="width: 100px; height: 100px; background: blue"></div> +</div> +<div id="target" class=auto style="position: relative; top: 100000px"> + <div style="width: 100px; height: 100px; background: blue"></div> +</div> |