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+++ b/layout/reftests/web-animations/style-updates-on-iteration-composition-changed-from-replace-to-accumulate.html
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+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>Update styles when iteration composition changed from replace to
+accumulate</title>
+<script src="animation-utils.js"></script>
+<style>
+#test {
+ width: 100px; height: 100px;
+ background: blue;
+}
+</style>
+<div id="test"></div>
+<script>
+ var anim = document.getElementById("test")
+ .animate({ marginLeft: [ "0px", "100px" ] },
+ { duration: 100000,
+ delay: -99999, // For starting right before second iteration.
+ easing: "steps(1, start)",
+ iterations: 2,
+ iterationComposite: "replace" });
+
+ waitForIterationChange(anim).then(() => {
+ // Changing iterationComposite updates the element style.
+ anim.effect.iterationComposite = "accumulate";
+ // Now margin-left of the element should be 200px.
+ document.documentElement.classList.remove("reftest-wait");
+ });
+</script>