I use WordPress 3.6-beta3-24407.
Comments output in HTML5 format use <cite class="fn"> for the comment author name markup, but W3C HTML5 says:
The cite element represents the title of a work
A person's name is not the title of a work - even if people call that person a piece of work - and the element must therefore not be used to mark up people's names.
cite is wrong use for the author name markup?