Pointer Events

The pointer-events here means the method this library use to detect the dragging of the scrollbar and the hover effect on the scrollbar

There are 2 methods to detect pointer events

<ng-scrollbar pointerEventsMethod="viewport">

pointerEventsMethod="viewport", will detect pointer events using viewport's mousemove, mousedown and mouseleave events.
pointerEventsMethod="scrollbar", will detect pointer events using scrollbar mousedown, mouseenter and mouseleave event.

In a nutshell, here are the pros and cons of each method with the `[appearance]` option:

Appearance ↓	viewport	scrollbar
Standard	Only if both scrollbars appear, the content may overlap under the scrollbar Scrolling over scrollbar works	The content never overlap under the scrollbars Scrolling over scrollbar doesn't work
Compact	Content overlaps under the scrollbar as intended Scrolling over scrollbar works	The content overlaps under the scrollbar as intended Scrolling over scrollbar doesn't work

My recommendation: If scrolling over scrollbar isn't a big deal, then go with pointerEventsMethod="scrollbar".

Theoretically scrollbar method is more performant because viewport method checks if the pointer is over the scrollbars while the pointer is moving over the viewport.

But most of the time, there won't be any difference in performance unless you have a complex design. try both and see what best fits your app.