How is animation implemented?

Question

JavaScript

sketchapp.com/extensions floating in black blocks. This custom writing or plugin is what?

Answer 1

As for the plugin, this is either self-writing, I don’t know. But there is an on-the-fly installation of animation divas.

Answer 2

Most likely self-written, blocks are generated there and animation is added to them,
here is an example:

.animate.visible > .animatable {
    animation-play-state: running;
}

there are 40 such blocks in total

Answer 3

This animation and shapes are created in css. Each figure has its own animation written in css.