Function do_match_relative_selectors 

fn do_match_relative_selectors<E: Element>(
    selectors: &[RelativeSelector<E::Impl>],
    element: &E,
    context: &mut MatchingContext<'_, E::Impl>,
    rightmost: SubjectOrPseudoElement,
) -> bool

Matches a relative selector in a list of relative selectors.