[luriel]

Why is anyone still using XHTML? I thought HTML5 had mercifully obsoleted that.

I for a long time bought into XHTML, just to find out that XHTML documents render slower than plain ol' HTML ones, and pretty much nobody was able to produce proper XHTML anyway.

[jmillikin]

XHTML was merged into HTML5, and renamed XHTML5.

Personally, I'm still using HTML4/XHTML1, and will continue to do so until HTML5 has stabilized and can be validated.