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+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>
+Opacity animation winning over opacity transition creates a stacking context
+for correct style.
+</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;
+ opacity: 1;
+ transition: opacity 100s steps(1, start);
+ animation: Opacity1 100s;
+}
+</style>
+<span></span>
+<div id="test"></div>
+<script>
+window.addEventListener("load", () => {
+ var target = document.getElementById("test");
+ getComputedStyle(target).opacity;
+
+ // CSS animation wins over transitions, so transition won't be visible during
+ // the CSS animation.
+ target.style.opacity = 0;
+ getComputedStyle(target).opacity;
+ document.documentElement.classList.remove("reftest-wait");
+});
+</script>