#data
<p><font size=4><font size=4><font size=4><script>document.getElementsByTagName("font")[2].setAttribute("size", "5");</script><font size=4><p>X
#errors
#document
| <html>
|   <head>
|   <body>
|     <p>
|       <font>
|         size="4"
|         <font>
|           size="4"
|           <font>
|             size="5"
|             <script>
|               "document.getElementsByTagName("font")[2].setAttribute("size", "5");"
|             <font>
|               size="4"
|     <p>
|       <font>
|         size="4"
|         <font>
|           size="4"
|           <font>
|             size="4"
|             "X"