How to animate one path in svg to another?

Question

SVG

It is required to animate the path of the svg to another path by smoothly changing the "d" attribute. Approximately as here: fashionto.ru , an arrow is animated on top of the menu. But here a third-party library is used. I don’t want to connect an extra library for the sake of animating one picture.

Answer 1

Is it no longer fashionable to access the source code through the console?