http://developers.de/blogs/damir_dobric/archive/2011/06/30/web-standards-update-for-microsoft-visual-studio-2010-sp1.aspxBunch of guys at Microsoft have created an unofficial extension for Visual Studio in their spare time . If you want to get now the better support for HTML5, CSS3 and new JavaScript features please take a look here . If you are hobby-developer the updateenCommunityServer 2008 SP1 (Build: 30619.63)