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+<!DOCTYPE html>
+<title>
+CSS opacity animation winning over web animation in delay phase creates
+a stacking context
+</title>
+<style>
+span {
+ height: 100px;
+ width: 100px;
+ position: fixed;
+ background: green;
+ top: 50px;
+}
+@keyframes Opacity1 {
+ from, to { opacity: 1; }
+}
+#test {
+ width: 100px; height: 100px;
+ background: blue;
+ animation: Opacity1 100s;
+}
+</style>
+<span></span>
+<div id="test"></div>
+<script>
+ document.getElementById("test")
+ .animate({ opacity: [0.1, 0.1] }, { duration: 100000, delay: 100000 });
+
+ requestAnimationFrame(function() {
+ document.documentElement.classList.remove("reftest-wait");
+ });
+</script>