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-rw-r--r--layout/reftests/css-animations/updating-animation-on-pseudo-element.html38
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diff --git a/layout/reftests/css-animations/updating-animation-on-pseudo-element.html b/layout/reftests/css-animations/updating-animation-on-pseudo-element.html
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+++ b/layout/reftests/css-animations/updating-animation-on-pseudo-element.html
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+<!DOCTYPE html>
+<html class="reftest-wait">
+<style>
+@keyframes anim {
+ from { margin-left: 10em; }
+ to { margin-left: 10em; }
+}
+#target::before {
+ content: 'before';
+}
+#target.anim::before {
+ animation: anim 100s infinite;
+ font-size: 10px;
+}
+#target.bigger-font::before {
+ font-size: 20px;
+}
+</style>
+<div id="target"></div>
+<script>
+addEventListener('DOMContentLoaded', () => {
+ var target = document.getElementById('target');
+
+ // Start an animation on pseudo element.
+ target.classList.add('anim');
+
+ requestAnimationFrame(() => {
+ // The animation on pseudo element should be updated
+ // when the target element classes are modified.
+ target.classList.add('bigger-font');
+
+ requestAnimationFrame(() => {
+ document.documentElement.classList.remove('reftest-wait');
+ });
+ });
+});
+</script>
+</html>