The 'required' attribute

Full Name Submit

The 'minlength' and 'maxlength' attribute

Description Submit

The 'pattern' attribute

Password Submit

The 'type = "email"' attribute

Email Address Submit

Other Input 'type' validation

Date URL Number TIme Submit

JavaScript Validation

Name

Email

Age

Date

Submit

JavaScript Constraint Validation API

Full Name Age Password Email URL Submit