HTML5: XFBML validates only if served as application/xhtml+xml
The XFBML markup language passes the W3C validation in HTML5 only if served as application/xhtml+xml.
Web programming languages and standards.
The XFBML markup language passes the W3C validation in HTML5 only if served as application/xhtml+xml.
How to clear inline-block boxes with jQuery by taking control over their horizontal distribution.
A practical example of code refactoring in jQuery.