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diff --git a/layout/reftests/flexbox/flexbox-dyn-changePadding-1b.xhtml b/layout/reftests/flexbox/flexbox-dyn-changePadding-1b.xhtml
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+++ b/layout/reftests/flexbox/flexbox-dyn-changePadding-1b.xhtml
@@ -0,0 +1,46 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!--
+    This test checks that we reflow sufficiently when a stretched, nested
+    flex container needs an incremental reflow.  This test should end up
+    rendering as a lime square, 100px by 100px.
+-->
+<html xmlns="http://www.w3.org/1999/xhtml"
+      class="reftest-wait">
+  <head>
+    <style>
+      #outerContainer {
+        display: flex;
+        width: 100px;
+        height: 100px;
+        background: red;
+      }
+      #tweakMe {
+        display: flex;
+        background: orange;
+        width: 100px;
+        /* height should stretch to fill parent's height, via
+         * parent's "align-items: stretch" (the default) */
+
+        padding-left: 1px;
+      }
+    </style>
+    <script>
+      function tweak() {
+        var tweakMe = document.getElementById("tweakMe");
+        tweakMe.style.paddingLeft = "0";
+        tweakMe.style.background = "lime";
+        document.documentElement.removeAttribute("class");
+      }
+      window.addEventListener("MozReftestInvalidate", tweak, false);
+    </script>
+  </head>
+  <body>
+    <div id="outerContainer">
+      <div id="tweakMe"></div>
+    </div>
+  </body>
+</html>