It does. It uses Spry validation. Spry is a Javascript framework developed by Adobe.
But it also uses Server Side Validation. My point in the previous replies was to point out that relying on any type of Javascript based validation as the only validation on your page is a bad Idea.
Javascript validation is really a bell and whistle.
To truly secure your page, you should be using Server Side Validation.
The 2 can be used on the same page, which is what form builder does.
It adds spry validation to show immediate feedback to the user, but also adds server validation so that if the user turns javascript of in the browser, they cannot bypass validation.
