A similar functionality already exists in WebWave is called "Shared elements". 
https://help.webwave.me/layout-objects---automate-your-work

This functionality (to add HTML, CSS or JS) is already available in WebWave.

https://help.webwave.me/html-css-and-javascript

I don't think this is done.

It still takes 24 hours for the SSL certificate when we add a custom domain, and it takes 48hours for the agency domain.

Hi! I've tested the layer stacking order [CTRL ] ] and [CTRL [ ] in Chrome on macOS and is not working.

Is there any progress on this?

I really need this simple feature, right now I need to inject Custom CSS to achieve simple shape like these:

This option is not available, what we have right now are the alignment options:

- space vertically

- space horizontally

Again, as I said in my first post. With the alignment options you can't specify an exact space value.

Thanks! But, this is how it worked before. 

The problem with this approach is that you need to publish the page (with changes) to see the result, because nothing you put in the HTML element is not executed in the editor.