Update - VS2010 Beta 2 – Validation ($SCHEMA$): Element is not supported

Note: This is an update to an earlier post based on feedback that I have received from various commenter's.

If you have adopted beta 2 of Visual Studio 2010 then you might have spotted a large amount of green squigglies underneath the tags in your markup. When you have over them you see a message like this:

Validation ($SCHEMA$): Element 'div' is not supported

This appears to be a bug in the system. When this is occurring your autocomplete will not have any html element – only asp.net controls and snippets – which makes it pretty hard to do your work.

To fix this error without resetting all of your Visual Studio configuration settings back to factory defaults follow these steps:

1. Click Tools | Options…
2. If you have "Show all settings" unticked then you can click the Validation node.
   
   Otherwise you will have to click Text Editor | HTML | Validation.
3. Make a selection in the Target: drop down (I picked XHTML 1.0 Transitional).
4. Click OK to save your changes.