How to make transition-delay for the whole list different?

Question

css

I'm trying to make a transitionDelay with javascript.
To do this, I generated li in the amount of 20 pieces
And now I want to make a delay in the start of the animation, that is, so that the width changes with a delay
But this does not work
Where did I go wrong?

Answer 1

You have an error in style initialization ->
`${sec} + 's'``${sec}s`