Tell us the process of creating complex animation on html css svg?

Question

css

How to make animation with css is clear. But how do they do something like this roxik.com/cat
1) Draw in tools like sketch? and insert the finished animation on the site.
2) draw svg objects and write separate logic for each
. Tell me a good resource)

Answer 1

1) No
2) Also no
This is an html5 canvas, <canvas>. Drive this word into a search engine and go for it, a wagon of materials. A good educational resource - posts on Habré :)