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Test Info:
<!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>