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+<!DOCTYPE HTML>
+<meta charset="utf-8">
+<title>CSS Test (Transforms): Flattening at the leafward edges of a preserve-3d scene</title>
+<link rel="author" title="L. David Baron" href="https://dbaron.org/">
+<link rel="author" title="Google" href="http://www.google.com/">
+
+<style>
+body {
+  margin: 0;
+}
+div {
+  position: absolute;
+  height: 100px;
+  width: 100px;
+  top: 0;
+  left: 0;
+}
+.flattener {
+  background: fuchsia;
+}
+.sibling {
+  background: blue;
+  top: 50px;
+  left: 25px;
+}
+.child {
+  background: silver;
+  left: 50px;
+}
+</style>
+
+<div class="sibling"></div>
+<div class="flattener"></div>
+<div class="child"></div>