I enjoy little lists like these, and the presentation here is also delightful. From a design engineer Jakub Krehel, Details that make interfaces feel better. A few of these stood out to me:

Make your animations interruptible. […] Users often change their intent mid-interaction. For example, a user may open a dropdown menu and decide they want to do something else before the animation finishes.

Yes. Never make the user wait for your animation to finish, unless the animation itself is meant to cause friction and slow the user down (which is very rare).

Make exit animations subtle. Exit animations usually work better when they’re more subtle than enter animations.

I love asymmetric transitions. My go-to analogy for this is “in real life, you don’t open the door the same way you close it.”

Add outline to images. A visual tweak I use a lot is adding a 1px black or white (depending on the mode) outline with 10% opacity to images.

This is very nice and (both literally and figuratively) sharp. In some contexts, you could even try to go for 0.5px.

(If you liked this page, it’s worth checking out Krehel’s other explainers, for example about gradients or drag gestures.)