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+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>
+Removing !important rule during delay phase of animation creates
+a stack context for correct style
+</title>
+<style>
+span {
+ height: 100px;
+ width: 100px;
+ position: fixed;
+ background: green;
+ top: 50px;
+}
+@keyframes Opacity0 {
+ from, to { opacity: 0 }
+}
+#test {
+ width: 100px; height: 100px;
+ background: blue;
+ animation: Opacity0 100s 100s;
+}
+</style>
+<span></span>
+<div id="test"></div>
+<script>
+window.addEventListener("load", () => {
+ var target = document.getElementById("test");
+ target.style.setProperty("opacity", "0.1", "important");
+
+ requestAnimationFrame(() => {
+ // Now the target opacity style should be 0.1 because of !important rule.
+
+ // Apply 100% opacity without important directive.
+ target.style.setProperty("opacity", "1", "");
+ requestAnimationFrame(() => {
+ // The CSS animation is no longer overridden but it's still in delay
+ // phase, so we should create a stacking context for 100% opacity style.
+ document.documentElement.classList.remove("reftest-wait");
+ });
+ });
+});
+</script>