Mortgage Calculator with HTML, CSS and vanilla Javascript

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

I'm most proud of the form validation and number formatting. I spent a whole day thinking about how I was going to get those to look good before I found out about the intl api

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

After the age Calculator project I couldn't say I encountered any problems with this one since they were both base on the same principle.

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

I want to know how to format the value of an input element after the user has entered the text in. I think that all ;)