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diff --git a/layout/reftests/web-animations/cancel-animation-with-selector-matching.html b/layout/reftests/web-animations/cancel-animation-with-selector-matching.html
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+++ b/layout/reftests/web-animations/cancel-animation-with-selector-matching.html
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+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>Discard cancelled animation styles</title>
+<style>
+#test {
+ width: 100px; height: 100px;
+ background-color: white;
+}
+.changed {
+ color: red;
+}
+
+</style>
+<div id="test"></div>
+<script>
+ var target = document.getElementById("test");
+ var anim = target.animate({ backgroundColor: [ "red", "red" ] }, 100000);
+
+ anim.ready.then(() => {
+ anim.cancel();
+ // Add a class name to cause selector matching in a subsequent restyle.
+ target.classList.add("changed");
+
+ document.documentElement.classList.remove("reftest-wait");
+ });
+</script>