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+<!DOCTYPE html>
+<html class="reftest-wait reftest-no-flush">
+<title>
+Opacity animation creates a stacking context when changing its target
+</title>
+<style>
+span {
+ height: 100px;
+ width: 100px;
+ position: fixed;
+ background: green;
+ top: 50px;
+}
+div {
+ width: 100px; height: 100px;
+ background: blue;
+}
+</style>
+<span></span>
+<div id="test"></div>
+<div id="another"></div>
+<script>
+ var anim = document.getElementById("test")
+ .animate({ opacity: [1, 1] }, { duration: 100000 });
+ anim.ready.then(function() {
+ anim.effect.target = document.getElementById("another");
+ requestAnimationFrame(function() {
+ document.documentElement.classList.remove("reftest-wait");
+ });
+ });
+</script>