Testing IE8.
/*/.test1 {background:#f88}/**/ - target IE8
head/*/+body/**/ .test2 - target IE8 (good for selector grouping)
html/*\*//*/* /**/ body .test5 - filter IE8 and maybe IE/Mac (seeing html * body)
html/*/* /**/ body .test6 - filter IE8 (seeing html * body)
*+html/*/* /**/ body .test7 - target IE7 and filter IE8