title: validation (xhtml 1.0 transitional) element 'video' is not supported - Error occured when I add the video in my website.
body: <p>I am using VS-2010 for development of my website. I want to add the video in my website.
  When I add the below code I got the error "validation (xhtml 1.0 transitional) element 'video' is not supported".</p>
  
  <pre><code>&lt;video width="320" height="240" controls&gt;
    &lt;source src="movie.mp4" type="video/mp4"&gt;
    &lt;source src="movie.ogg" type="video/ogg"&gt;
    Your browser does not support the video tag.
  &lt;/video&gt; 
  </code></pre>
  
  <p>suggest me something...</p>