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diff --git a/testing/web-platform/tests/css/CSS2/floats-clear/margin-collapse-clear-015.xht b/testing/web-platform/tests/css/CSS2/floats-clear/margin-collapse-clear-015.xht
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+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+
+<html xmlns="http://www.w3.org/1999/xhtml">
+
+ <head>
+
+  <title>CSS Test: Margin collapsing with clearance - Margins collapsing of an element's top margin with its first in-flow child should not be affected by clear and clearance</title>
+
+  <link rel="help" href="http://www.w3.org/TR/CSS21/box.html#collapsing-margins" />
+  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" />
+  <link rel="author" title="Bruno Fassino" href="fassino[at]gmail.com" />
+  <link rel="match" href="margin-collapse-clear-015-ref.xht" />
+
+  <meta content="When an element with clear set to it (to other than 'none') has a first in-flow child and their top margins are adjoining, then these margins should collapse normally." name="assert" />
+
+  <style type="text/css"><![CDATA[
+  #rel-pos-wrapper {position: relative;}
+
+  #parent-lime
+  {
+  background-color: lime;
+  border-top: black solid 1px;
+  width: 50%;
+  }
+
+  #float-left-blue
+  {
+  background-color: blue;
+  float: left;
+  height: 100px;
+  width: 100px;
+  }
+
+  #clear-left {clear: left;}
+
+  #clear-left > div
+  {
+  background-color: aqua;
+  height: 60px;
+  margin-top: 140px;
+  }
+
+  #next-yellow
+  {
+  background-color: yellow;
+  height: 100px;
+  }
+
+  .ref-overlapped-red
+  {
+  background-color: red;
+  left: 0;
+  position: absolute;
+  z-index: -1;
+  }
+
+  #ref1
+  {
+  height: 200px;
+  top: 1px;
+  width: 50%;
+  }
+
+  #ref2
+  {
+  height: 100px;
+  top: 201px;
+  width: 100%;
+  }
+  ]]></style>
+
+ </head>
+
+ <body>
+
+  <p>Test passes if there is <strong>no red</strong>.</p>
+
+  <div id="rel-pos-wrapper">
+
+    <div id="parent-lime">
+      <div id="float-left-blue"></div>
+      <div id="clear-left">
+         <div></div>
+      </div>
+    </div>
+
+    <div id="next-yellow"></div>
+
+    <!--
+    #ref1 and #ref2 boxes create a sort of 'reference rendering'
+    where #ref1 should be covered, overlapped by #parent-lime
+    while #ref2 should be covered, overlapped by #next-yellow.
+    -->
+
+    <div id="ref1" class="ref-overlapped-red"></div>
+    <div id="ref2" class="ref-overlapped-red"></div>
+
+  </div>
+
+ </body>
+</html>