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+<!DOCTYPE html>
+<title>
+Transform animation generates a containing block for fixed-pos descendants
+even if the animation value is 'transform:none'
+</title>
+<style>
+#parent {
+ visibility: hidden;
+ animation: anim 100s step-end;
+}
+
+#fixed {
+ position: fixed;
+ background-color: green;
+ height: 100px;
+ width: 100px;
+}
+
+#scroll {
+ overflow-y: scroll;
+ overflow-x: hidden;
+ height: 80px;
+ width: 100px;
+}
+@keyframes anim {
+ 0% { transform: none; }
+ 100% { transform: translateX(0px); }
+}
+</style>
+<div id="scroll">
+ <div id="parent">
+ <div id="fixed"></div>
+ </div>
+</div>