Ping coming soon page with accessible subscription form

I want to add fade out & fade in effect on .subscribeForm_feedback element when it's text is changed. To do this i can:

1. add a class to hide the element
2. change the text
3. remove the class to show the element So steps 2 and 3 should be delayed until the element fades out. I did just that in one of the challenges (code). The question is, is there a way to achieve the same effect without hardcoding the delay value in js?