As far as I researched, Safari seems to have 2 tricky behavior (maybe a kind of bug?):

1. Imperative scrollTop update during scrolling sometimes delays. For example, setting scrollTop += 1000 will usually affect the next scroll event, however sometimes not next but after the next in Safari.
2. Imperative scrollTop update during scrolling sometimes delays browser's paint. That means updated items range may not be painted immediately and can cause blank.

Originally posted by @inokawa in #261 (comment)