At your eye line you can't see above of below the shelves, but for the ones above your eye line (you are looking up to) and can only see their undersides, and for the ones below you eyeline (you are looking down at those and can only see their top surfaces).
WebDriver wuxuu siinayaa qalab barnaamijka Interface Programming Interface (API) kaas oo bixiya taageero sare oo loogu talagalay baaritaanka webka iyo jarista.