Is 'Service Worker' support offline HTML form data?

Service Workers essentially act as proxy servers that sit between web applications.

My concern: Is ServiceWorker also support for offline forms? - If so then my other list of concerns are:

1. Where it stored the incomplete HTML form data at client side (Storage, Session, Local, Database)?


2. In which form it stores user's filled data (encryption etc.)


3. How the data security/privacy tackled? that the returning user is the same user? - if one user had filled out the form in public place and lost the internet connection and left the incomplete form and move on, now the next immediate user can see the incomplete form data, where the last user left the form.