asp.net mvc 3 - Is it okay to include markup after the closing </html> tag? -

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since closing html tag optional, okay include markup after closing </html> tag?

an example of exists phil haack's routedebugger library. sample output looks this:

<!doctype html> <html> <head>     <title>index</title>     <link href="/content/site.css" rel="stylesheet" type="text/css" />     <script src="/scripts/jquery-1.4.4.min.js" type="text/javascript"></script> </head>  <body>  <h2>index</h2>  </body> </html> <!-- content after closing html tag! --> <html> <div id="haackroutedebugger" style="background-color: #fff;">     <style>         #haackroutedebugger, #haackroutedebugger td, #haackroutedebugger th {background-color: #fff; font-family: verdana, helvetica, san-serif; font-size: small;}         #haackroutedebugger tr.header td, #haackroutedebugger tr.header th {background-color: #ffc;}     </style>     <hr style="width: 100%; border: solid 1px #000; margin:0; padding:0;" />     <h1 style="margin: 0; padding: 4px; border-bottom: solid 1px #bbb; padding-left: 10px; font-size: 1.2em; background-color: #ffc;">route debugger</h1>     <div id="main" style="margin-top:0; padding-top:0">         <p style="font-size: .9em; padding-top:0">             type in url in address bar see defined routes match it.              {*catchall} route added list of routes automatically in              case none of routes match.         </p>         <p style="font-size: .9em;">             generate urls using routing, supply route values via query string. example: <code>http://localhost:14230/?id=123</code>         </p>         <p><label style="font-weight: bold; font-size: 1.1em;">matched route</label>: {controller}/{action}/{id}</p>          <div style="float: left;">             <table border="1" cellpadding="3" cellspacing="0" width="300">                 <caption style="font-weight: bold;">route data</caption>                 <tr class="header"><th>key</th><th>value</th></tr>                     <tr><td>controller</td><td>home&nbsp;</td></tr> <tr><td>action</td><td>index&nbsp;</td></tr>             </table>         </div>         <div style="float: left; margin-left: 10px;">             <table border="1" cellpadding="3" cellspacing="0" width="300">                 <caption style="font-weight: bold;">data tokens</caption>                 <tr class="header"><th>key</th><th>value</th></tr>              </table>         </div>         <hr style="clear: both;" />         <table border="1" cellpadding="3" cellspacing="0">             <caption style="font-weight: bold;">all routes</caption>             <tr class="header">                 <th>matches current request</th>                 <th>url</th>                 <th>defaults</th>                 <th>constraints</th>                 <th>datatokens</th>             </tr>             <tr><td><span style="color: #c00">false</span></td><td>{resource}.axd/{*pathinfo}</td><td>(null)</td><td>(empty)</td><td>(null)</td></tr><tr><td><span style="color: #0c0">true</span></td><td>{controller}/{action}/{id}</td><td>controller = home, action = index, id = urlparameter.optional</td><td>(empty)</td><td>(empty)</td></tr><tr><td><span style="color: #0c0">true</span></td><td>{*catchall}</td><td>(null)</td><td>(null)</td><td>(null)</td></tr>         </table>         <hr />         <h3>current request info</h3>         <p>             apprelativecurrentexecutionfilepath portion of request routing acts on.         </p>         <p><strong>apprelativecurrentexecutionfilepath</strong>: ~/</p>     </div> </div>

i notice appended markup begins <html> tag. presence of tag somehow validate location of content?

no, it's not ok, browsers forgiving bad html.

try http://validator.w3.org/ see if document valid html or not (it isn't).


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