Visual Studio's HTML markup editor is basically an XML editor with HTML tag validation added. You're not going to get rid of XML that easily. You could try the following, but no guarantees:
- Tools -> Options -> Text Editor -> HTML -> Format -> Auto insert close tag = false
- Tools -> Options -> Text Editor -> HTML -> Miscellaneous -> Format HTML on paste = false
- Tools -> Options -> Text Editor -> HTML -> Validation -> Target = HTML 4.01
But more fundamentally, why bother? <br />
is not technically valid HTML 4.01, but all browsers recognise it and do the right thing. <br/>
is more problematic.
See the W3C XHTML compatibility guidelines for more info.