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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
commit26a029d407be480d791972afb5975cf62c9360a6 (patch)
treef435a8308119effd964b339f76abb83a57c29483 /testing/web-platform/tests/layout-instability/clip-negative-bottom-margin.html
parentInitial commit. (diff)
downloadfirefox-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>
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diff --git a/testing/web-platform/tests/layout-instability/clip-negative-bottom-margin.html b/testing/web-platform/tests/layout-instability/clip-negative-bottom-margin.html
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+++ b/testing/web-platform/tests/layout-instability/clip-negative-bottom-margin.html
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+<!DOCTYPE html>
+<title>Layout Instability: clip with negative bottom margin</title>
+<link rel="help" href="https://wicg.github.io/layout-instability/" />
+<style>
+
+#scroller { overflow: scroll; width: 200px; height: 500px; }
+#space { height: 1000px; margin-bottom: -500px; }
+#j { width: 150px; height: 150px; background: yellow; }
+
+</style>
+<div id='scroller'>
+ <div id='space'></div>
+ <div id='j'></div>
+</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);
+
+ // Increase j's top margin by 100px. Since j is fully clipped by the scroller,
+ // this should not generate a shift.
+ document.querySelector("#j").style.marginTop = "100px";
+
+ await waitForAnimationFrames(3);
+ assert_equals(watcher.score, 0);
+}, "Clip with negative bottom margin.");
+
+</script>
+
+