I've downloaded the latest version of Visual Studio 2010's Service Pack 1 from here. However, after I extracted the files, installed the SP1, and restarted the whole OS, still I don't get support for CSS3 and HTML5 in VS2010.
Have you experienced the same problem? Anyone has any idea?
Update: HTML5 and CSS3 support is promised in these links (and of course, many more could be found):
And also I've installed Web Standards Update for Microsoft Visual Studio 2010 SP1, but still no success.
visual studio 2010 is not suopporting HTML5 and CSS3. you need to install Web Standards Update for Microsoft Visual Studio 2010 SP1
Go to Tools->Options->Text Editor->HTML->Validations Select Target As HTML5 Also for CSS on Home VS screen near run button select combobox as css 3.0 it will definetly solve ur problem.
来源：https://stackoverflow.com/questions/7938674/visual-studio-2010-sp1-is-installed-still-no-support-for-css3-and-html5