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diff --git a/layout/reftests/box/flexbox-child-is-abspos-container-2.html b/layout/reftests/box/flexbox-child-is-abspos-container-2.html
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+<!-- Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/ -->
+<!-- This testcase has a -moz-box element with a block as its only child, which
+     forms a containing block for an absolutely positioned grandchild. Also, in
+     this case, the grandchild is taller than its parent and grandparent. -->
+<html>
+  <head>
+    <style>
+      body { margin-top: 50px }
+      .box { display: -moz-box }
+      .relpos_parent {
+        position: relative;
+        width: 100px;
+        height: 100px;
+        background: lightblue;
+      }
+      .abspos_child {
+        position: absolute;
+        left: 30px;
+        bottom: 10px;
+        width: 20px;
+        height: 130px;
+        background: purple;
+      }
+    </style>
+  </head>
+  <body>
+    <div class="box">
+      <div class="relpos_parent">
+        <div class="abspos_child"></div>
+      </div>
+    </div>
+  </body>
+</html>