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Everything you need to know about skeleton screens
Skeleton screens are very popular these days. This article digs into how to effective skeleton screens are and how to best use them. (The study even covers what type of motion works best.)
Microinteractions in user experience
If you ever need to convince your boss that microinteractions are useful and important, this article from the Nielsen Norman Group is the you want to bookmark.
Animated grid previews
A neat animated effect moving images into their grid positions using TweenMax, CSS Grid and custom properties from MaryLou at Codrops.