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diff --git a/testing/web-platform/tests/css/css-display/run-in/run-in-basic-013.xht b/testing/web-platform/tests/css/css-display/run-in/run-in-basic-013.xht
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+++ b/testing/web-platform/tests/css/css-display/run-in/run-in-basic-013.xht
@@ -0,0 +1,37 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml">
+ <head>
+  <title>CSS Test: Run in - dynamically inserted run-in should run in</title>
+  <link rel="author" title="Boris Zbarsky" href="mailto:bzbarsky@mit.edu"/>
+  <link rel="reviewer" title="Microsoft" href="http://www.microsoft.com/" />
+  <link rel="help" href="http://www.w3.org/TR/CSS21/visuren.html#run-in"/>
+  <link rel="match" href="run-in-basic-ref.xht"/>
+  <meta name="flags" content="dom" />
+  <meta name="assert"
+        content="Tests that dynamically inserted run-ins run in."/>
+  <style type="text/css"><![CDATA[
+    div { display: block; }
+    .run-in { display: run-in; font-weight: bold }
+    #target { border: 2px solid black; }
+  ]]></style>
+  <script type="text/javascript"><![CDATA[
+    function flushLayout(elt) {
+      elt.offsetWidth; /* Just undefined on non-elements, but that's ok */
+      for (var i = 0; i < elt.childNodes.length; ++i) {
+        flushLayout(elt.childNodes[i]);
+      }
+    }
+    window.onload = function() {
+      flushLayout(document.documentElement);
+      var t = document.getElementById("target");
+      var s = document.createElement("div");
+      s.appendChild(document.createTextNode("Run-in header"));
+      s.className = "run-in";
+      t.parentNode.insertBefore(s, t);
+    }
+  ]]></script>
+ </head>
+ <body>
+   <div id="target">Start of block.  The run-in header should be inside the border around this block and there should be no space between the word "header" and the word "Start".</div>
+ </body>
+</html>