pub fn matches_compound_selector_from<E>(
    selector: &Selector<E::Impl>,
    from_offset: usize,
    context: &mut MatchingContext<'_, E::Impl>,
    element: &E,
) -> CompoundSelectorMatchingResultwhere
    E: Element,Expand description
Matches a compound selector belonging to selector, starting at offset
from_offset, matching left to right.
Requires that from_offset points to a Combinator.
NOTE(emilio): This doesn’t allow to match in the leftmost sequence of the complex selector, but it happens to be the case we don’t need it.