title: MS_POSITIONING Is Not a Valid Attribute of Elements BODY and DIv
body: <p>We have a lot of legacy ASPX pages in our solution. Now we want to fix the code styling (bring it to the HTML5 standard) and generally clean the code on these ASPX pages. One of the issued I ran into is the <code>ms_positioning</code> attribute. It appears a lot in the <code>&lt;body&gt;</code> and <code>&lt;div&gt;</code> elements. Visual Studio 2010 shows this warning: </p>
  
  <p><code>Validation (XHTML 1.0 Transitional): Attribute 'ms_positioning' is not a valid attribute of element 'div'.</code></p>
  
  <p><strong>Question:</strong></p>
  
  <ol>
  <li>Should I try to fix this warning or should I just leave
  <code>ms_positioning</code> attribute alone?</li>
  <li>Is there another way to achieve the same functionality without <code>ms_positioning</code> attribute (I use both <code>ms_positioning="GridLayout"</code> and <code>ms_positioning="FlowLayout"</code> values) and in accordance with HTML5 standard?</li>
  </ol>
  
  <p>Thank you for your help.</p>