Is there any plugin to add custom divs and IDs to divs?

Things I have tried

I tried using custom css.
There are some limitations in CSS.

What I’m trying to do

I am trying to add more complex CSS styling, including pure CSS animated backgrounds, etc. To achieve certain feats, I require more dedicated elements, because they run into many divs and may also require JS.
So I want to add custom html divs/elements + JS just like how we add CSS.

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