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+<!DOCTYPE html>
+<title>
+Opacity animation creates a stacking context even if the opacity property
+is overridden by an !important rule
+</title>
+<style>
+span {
+ height: 100px;
+ width: 100px;
+ position: fixed;
+ background: green;
+ top: 50px;
+}
+@keyframes Opaque {
+ from, to { opacity: 1 }
+}
+#test {
+ width: 100px; height: 100px;
+ background: blue;
+ animation: Opaque 100s;
+ opacity: 1 !important;
+}
+</style>
+<span></span>
+<div id="test"></div>