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-rw-r--r--testing/web-platform/tests/scroll-animations/scroll-timelines/animation-with-overflow-hidden-ref.html45
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diff --git a/testing/web-platform/tests/scroll-animations/scroll-timelines/animation-with-overflow-hidden-ref.html b/testing/web-platform/tests/scroll-animations/scroll-timelines/animation-with-overflow-hidden-ref.html
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+++ b/testing/web-platform/tests/scroll-animations/scroll-timelines/animation-with-overflow-hidden-ref.html
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+<!DOCTYPE html>
+<title>Scroll timeline with Web Animation using a scroller with overflow hidden</title>
+<style>
+ #box {
+ width: 100px;
+ height: 100px;
+ background-color: green;
+ transform: translate(0, 100px);
+ opacity: 0.5;
+ will-change: transform; /* force compositing */
+ }
+
+ #covered {
+ width: 100px;
+ height: 100px;
+ background-color: red;
+ }
+
+ #scroller {
+ overflow: hidden;
+ height: 100px;
+ width: 100px;
+ will-change: transform; /* force compositing */
+ }
+
+ #contents {
+ height: 1000px;
+ width: 100%;
+ }
+</style>
+
+<div id="box"></div>
+<div id="covered"></div>
+<div id="scroller">
+ <div id="contents"></div>
+</div>
+
+<script>
+ window.addEventListener('load', function() {
+ // Move the scroller to halfway.
+ const scroller = document.getElementById("scroller");
+ const maxScroll = scroller.scrollHeight - scroller.clientHeight;
+ scroller.scrollTop = 0.5 * maxScroll;
+ });
+</script>