Best way to integrate validation errors and hints into web form

1. How do I add a validation to a web form?
2. How do you implement form validation in HTML?

How do I add a validation to a web form?

Drag and drop Validation controls from toolbar: Copy paste the following code where I have map validation control with other controls, such as textboxes: <div> Full Name :<asp:TextBox ID="txtName" placeholder="Enter Full Name" runat="server"></asp:TextBox>

How do you implement form validation in HTML?

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.