Use Minimized CSS and JavaScript?
useMin=0 useMinl=1

Debug Layouts
?debuglayout=1 ?debuglayout=containers

HTML5 Set for session:
?HTML5=0 ?HTML5=1
?HTML5ish=0 HTML5ish=1 HTML5ish means to use XHTML but to have some blocks generate in HTML5 style

HTML5 Set for one browse:
?HTML5=0 ?HTML5=1
?HTML5ish=0 ?HTML5ish=1

Language:
English / Hsilgne | Reverselish / Hsilesrever

mobile:
mobile=0 mobile=1 tablet=0 tablet=1