Edited Unassigned: htmleditorextender generates invalid xhtml [27423]

Hello,
The htmleditorextender control produces invalid xhtml (like <br> instead of <br/>)
and old html (like <font color="" size="" face=""> instead of using css rules color: ; font-size: ; font-family: ;).
It's an issue because I use the generated html to produce pdf and word format with third party libraries
that rely on valid xhtml to work properly.

It's a very useful extender but I don't understand why it still uses old html.

Thank you.