Form input - Follow expected sequence or offer field validation?

1. How do you validate input form?
2. What are the different types of form validation?
3. How to validate input field in HTML?

How do you validate input form?

To validate the form using HTML, we will use HTML <input> required attribute. The <input> required attribute is a Boolean attribute that is used to specify the input element must be filled out before submitting the Form.

What are the different types of form validation?

There are two validation standards: server side validation and client side validation. There are several ways to achieve accurate form validation for each of these standards. Server side validation is performed by a web server, after input has been sent to the server.

How to validate input field in HTML?

The simplest HTML validation feature is the required attribute. To make an input mandatory, add this attribute to the element. When this attribute is set, the element matches the :required UI pseudo-class and the form won't submit, displaying an error message on submission when the input is empty.