How to return the value of a variable from the setTimeout/setInterval -function?

Question

css

It is necessary to return a value from the setTimeout/setInterval function and pass the result further.
Now I get undefined
Example on codepen https://codepen.io/PolyakhAlex/pen/dzmLoP

Answer 1

Through pseudo and additional element.
Depends on where it will be placed, of course, but something like this:
You can still through the wrapper and flex

Answer 2

We shift the title with a negative margin upwards and make a border through the pseudo-element, except for the top one.

Answer 3

Use Promise / async-await Luke!