To test for cross-browsers inconsistences (native selector engine):

NOTE1: All the following tests lines should be green on any browser, even those missing QSA support.
NOTE2: Internal Query Selector API's are now overwritten to force testing native selectors engine.

Adjacent sibling combinators (E + F)

Adjacent sibling and general descendant combinators (E + F   F)

Adjacent sibling and child selector combinators (E + F > F)

Adjacent sibling and adjacent sibling combinators (E + F + F)

 

Adjacent sibling and general sibling combinators (E + F ~ F)

 

General sibling combinators (E ~ F)

General sibling and general descendant combinators (E ~ F   F)

General sibling and child selector combinators (E ~ F > F)

General sibling and adjacent sibling combinators (E ~ F + F)

 

General sibling and general sibling combinators (E ~ F ~ F)