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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS transforms: Creating containing block for fixed positioned elements</title>
+<link rel="author" title="L. David Baron" href="https://dbaron.org/">
+<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css-transforms-1/#perspective-property">
+<link rel="match" href="containing-block-dynamic-1-ref.html">
+<meta name="assert" content="It also establishes a containing block (somewhat similar to position: relative), just like the transform property does.">
+<meta name="flags" content="dom">
+<style>
+  html, body { margin: 0; padding: 0 }
+  #changeperspective {
+    position: absolute;
+    top: 100px;
+    left: 100px;
+  }
+
+  #abscovered {
+    position: absolute;
+    top: 50px;
+    left: 50px;
+    background: red;
+    height: 100px;
+    width: 100px;
+  }
+
+  #fixedmoves {
+    position: fixed;
+    top: 50px;
+    left: 50px;
+    background: green;
+    height: 100px;
+    width: 100px;
+  }
+</style>
+<body>
+  <div id="changeperspective">
+    <div id="abscovered"></div>
+    <div id="fixedmoves"></div>
+  </div>
+  <script>
+    var changeperspective = document.getElementById("changeperspective");
+    var fixedmoves = document.getElementById("fixedmoves");
+    var causeFlush = fixedmoves.offsetTop;
+    changeperspective.style.perspective = "1000px";
+  </script>
+</body>