Make validation like on weboffice.tinkoff.ru?

Question

JavaScript

Hello! Tell me how to make a form with validation like on the Tinkov page?

Answer 1

What are you actually interested in - Registration form?

Answer 2

If you mean the registration form, then this form is implemented using the AngularJS js-framework.
For example, I implemented approximately the same form using Angular 4 and Angular Material Design. In the tutorials of the library and the framework, everything is beautiful and accessible:
https://material.angular.io/components - Angular Material Design
https://angular.io/docs - Angular Framework