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diff --git a/testing/web-platform/tests/css/css-display/run-in/run-in-contains-block-005.xht b/testing/web-platform/tests/css/css-display/run-in/run-in-contains-block-005.xht
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+<!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 - child dynamically toggled to inline display should allow running 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 run-ins run in if they have a child
+                 dynamically toggled to inline display."/>
+  <style type="text/css"><![CDATA[
+    div { display: block; }
+    .run-in { display: run-in; font-weight: bold }
+    #target { border: 2px solid black; }
+    .inline { display: inline; }
+  ]]></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);
+      document.getElementById("r").className = "inline";
+    }
+  ]]></script>
+ </head>
+ <body>
+   <div class="run-in">Run-in header<div id="r"></div></div>
+   <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>