Newsletter sign-up form with success message

What are you most proud of, and what would you do differently next time?

🔎 Form validation is a wide-ranging topic. I would like to deal with it more intensively in the future. For now I used built-in form validation with a little JS to get a result that I was initially satisfied with.

What challenges did you encounter, and how did you overcome them?

👉 One question was, how should I deal with the success message?

I used the dialog-element here for the first time to call up the success message with the submit button.

What specific areas of your project would you like help with?

I would be very grateful for ideas (sources) on how to improve email/form validation.