HTML 5 intellisense and validation schema for Visual Studio 2008 and Visual Web Developer
You all probably know that new HTML 5 standard is coming. We made a new intellisense schema that you can add to VS 2008 or VWD Express 2008 and get intellisense and validation on HTML 5 elements. Note that schema is for markup only, we do not have DOM2 update for jscript intellisense yet. How to install the schema: Download attached ZIP file. Place html_5.xsd in C:\Program Files (x86)\Microsoft Visual Studio 9.0\Common7\Packages\schemas\html Run either x86 or x64 reg file depending on the OS and VS/VWD flavors installed. For example, for VWD Express installed on 64-bit OS run HTML-5-Schema-Reg-x64-VWD.reg and for VS 2008 installed on 32-bit OS run HTML-5-Schema-Reg-x86.reg. Restart VS You can select HTML 5 in the schema dropdown and HTML 5 element
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Read the complete post at http://blogs.msdn.com/webdevtools/archive/2009/11/18/html-5-intellisense-and-validation-schema-for-visual-studio-2008-and-visual-web-developer.aspx