diff --git a/layout/reftests/bugs/424465-1-ref.html b/layout/reftests/bugs/424465-1-ref.html
new file mode 100644
index 00000000000..05f254e8198
--- /dev/null
+++ b/layout/reftests/bugs/424465-1-ref.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml">
+  <head>            
+    <title>424465 testcase</title>         
+    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
+         
+    <style type="text/css">      
+      .standardform {
+      background-color: #00f000;
+      border: 1px solid #000000; 
+      margin-bottom: 3px; /* Remove this line and bug disappears */
+      }  
+    </style>  
+
+  </head>
+
+  <body>
+
+    <form method="get" action="#">
+      <table class="standardform" cellspacing="5">
+        <tbody>
+          <tr>
+            <td colspan="2" id="hiddenColumnBugged">
+              <div>.: See the bug ? :.<br/>
+                <img src='data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAANwAAAATCAIAAAB0hvS3AAAABGdBTUEAALGOfPtRkwAAACBjSFJNAAB6JQAAgIMAAPn/AACA6AAAdTAAAOpgAAA6lwAAF2+XqZnUAAAAuUlEQVR4nGJkYPjPMApGwWACAAHENNAOGAWjAB0ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABBgAsywBJafN/+UAAAAASUVORK5CYII=' />
+                </div>
+            </td>
+          </tr>
+        </tbody>
+
+      </table>
+    </form>
+  </body>
+
+</html>
diff --git a/layout/reftests/bugs/424465-1.html b/layout/reftests/bugs/424465-1.html
new file mode 100644
index 00000000000..869f24b1981
--- /dev/null
+++ b/layout/reftests/bugs/424465-1.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" class="reftest-wait">
+  <head>            
+    <title>424465 testcase</title>         
+    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
+         
+    <style type="text/css">      
+      .standardform {
+      background-color: #00f000;
+      border: 1px solid #000000; 
+      margin-bottom: 3px; /* Remove this line and bug disappears */
+      }  
+    </style>  
+
+    <script type="text/javascript">
+    //<![CDATA[
+
+    window.addEventListener("MozReftestInvalidate",
+      function() {
+        showBug();
+        document.documentElement.className = "";
+      }, false);
+
+    function showBug()
+    {
+		document.getElementById("hiddenColumnBugged").innerHTML = "<div>.: See the bug ? :.<br /><img src='data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAANwAAAATCAIAAAB0hvS3AAAABGdBTUEAALGOfPtRkwAAACBjSFJNAAB6JQAAgIMAAPn/AACA6AAAdTAAAOpgAAA6lwAAF2+XqZnUAAAAuUlEQVR4nGJkYPjPMApGwWACAAHENNAOGAWjAB0ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABNBoohwFgw4ABBgAsywBJafN/+UAAAAASUVORK5CYII=' /><\/div>";
+    }
+
+    //]]>
+    </script>
+
+  </head>
+
+  <body>
+
+    <form method="get" action="#">
+      <table class="standardform" cellspacing="5">
+        <tbody>
+          <tr>
+            <td colspan="2" id="hiddenColumnBugged">
+              <input onclick="showBug(); return false;" value="Trigger Bug" type="button" />
+            </td>
+          </tr>
+        </tbody>
+
+      </table>
+    </form>
+  </body>
+
+</html>
diff --git a/layout/reftests/bugs/reftest.list b/layout/reftests/bugs/reftest.list
index 86ed02682ec..8cc71c887bd 100644
--- a/layout/reftests/bugs/reftest.list
+++ b/layout/reftests/bugs/reftest.list
@@ -948,6 +948,7 @@ fails-if(MOZ_WIDGET_TOOLKIT=="gtk2") == 424074-1-ref2.xul 424074-1-ref3.xul
 == 424236-10.html 424236-10-ref.html
 == 424236-11.html 424236-3-ref.html
 == 424434-1.html 424434-1-ref.html
+== 424465-1.html 424465-1-ref.html
 == 424631-1.html 424631-1-ref.html
 == 424710-1.html 424710-1-ref.html
 == 424766-1.html 424766-1-ref.html
