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diff --git a/layout/reftests/css-animations/no-style-sharing-with-animations.html b/layout/reftests/css-animations/no-style-sharing-with-animations.html
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+++ b/layout/reftests/css-animations/no-style-sharing-with-animations.html
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+<!DOCTYPE html>
+<html class="reftest-wait">
+<style>
+.animation {
+ animation: anim 100s forwards;
+}
+@keyframes anim {
+ 0% { background-color: red; }
+ 100% { background-color: red; }
+}
+div {
+ background-color: green;
+ width: 100px;
+ height: 100px;
+}
+</style>
+<div class="animation"></div>
+<div class="animation"></div>
+<script>
+document.addEventListener('MozReftestInvalidate', () => {
+ requestAnimationFrame(() => {
+ document.styleSheets[0].cssRules[0].style.animationName = 'none';
+ document.documentElement.classList.remove('reftest-wait');
+ });
+}, false);
+</script>