fn fast_connected_elements_with_id<'a, N>(
    root: N,
    id: &AtomIdent,
    case_sensitivity: CaseSensitivity,
) -> Result<&'a [N::ConcreteElement], ()>where
    N: TNode + 'a,Expand description
Fast path for iterating over every element with a given id in the document
or shadow root that root is connected to.