offset() is returning improper top, left for scaled viewports on devices such as Chromebook Touch/Surface/iOS/Android for relatively positioned parents. · Issue #3187 · jquery/jquery · GitHub
Element size and scrolling
offset-path - CSS: Cascading Style Sheets | MDN
Метод .offset() | jQuery справочник
offset-anchor interactive example not displaying · Issue #1826 · mdn/interactive-examples · GitHub