http://blogs.msdn.com/b/zainnab/archive/2011/04/12/vs2010-sp1-new-features-html-5-and-css-3-support.aspxMenu:&#160;&#160; Tools | Options | Text Editor | HTML | Validation Command:&#160; Tools.Options Versions:&#160; 2010 SP1 Code:&#160; vstipEdit0096 &#160; &#160; One of the more exciting new features included with Visual Studio 2010 Service Pack 1 isen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.msdn.com/b/zainnab/archive/2011/04/12/vs2010-sp1-new-features-html-5-and-css-3-support.aspx#10152486Tue, 12 Apr 2011 11:31:39 GMT91d46819-8472-40ad-a661-2c78acb4018c:10152486zainnab<p>Although I didn&#39;t add it in the main text, if you are using VS2008 you can get some HTML5 support by going here: &nbsp;<a rel="nofollow" target="_new" href="http://blogs.msdn.com/b/webdevtools/archive/2009/11/18/html-5-intellisense-and-validation-schema-for-visual-studio-2008-and-visual-web-developer.aspx">blogs.msdn.com/.../html-5-intellisense-and-validation-schema-for-visual-studio-2008-and-visual-web-developer.aspx</a></p> <div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=10152486" width="1" height="1">