Sticky elementsApproved

Sticky element represents any HTML element that keeps in view even if you scroll. Please note, that the sticky element position is in the middle of **viewport**. It consists of three parts: * The sticky element itself, identified by a `data-sticky` attribute with a unique identifier for the element as a value. * Marker where it undocks (starts scrolling), identified by a `data-sticky-undock` attribute with the identifier as a value. * Marker where it docks (stops scrolling), identified by a `data-sticky-dock` attribute with the identifier as a value. Both markers are optional. If you omit the undock marker, the start of the document is used. If you omit the dock marker the end of the document is used.