title: VS2010, HTML 5 and CSS 3 Validation
body: <p>I want to switch CSS validation in VS2010 SP1 from CSS 2.1 to CSS 3.</p>
  
  <p>I came across this answer:</p>
  
  <p><a href="https://stackoverflow.com/questions/3931801/is-it-possible-to-change-css-validation-scheme-in-vs2010">Is it possible to change CSS Validation scheme in VS2010</a></p>
  
  <p>What is not clear to me is how to activate CSS 3 validation.  I did find that switching HTML validation to HTML 5 causes CSS to be validated as CSS 3 (after installing <a href="http://visualstudiogallery.msdn.microsoft.com/7211bcac-091b-4a32-be2d-e797be0db210/view/Discussions" rel="nofollow noreferrer">CSS 3 Intellisense Schema</a>).</p>
  
  <p>However, I would have thought that the HTML level and the CSS level would be orthogonal.</p>
  
  <p>Am I missing something, or does the HTML validation switch truly also control the CSS validation level?</p>