The defines a hidden input field.. A hidden field lets web developers include data that cannot be seen or modified by users when a form is submitted. We know that a datepicker is used to select a particular date from a calendar. PHP Form Handling PHP Form Validation PHP Form Required PHP Form URL/E-mail PHP Form Complete PHP Advanced PHP Date and Time PHP Include PHP File Handling PHP File Open/Read PHP File Create/Write PHP File Upload PHP Cookies PHP Sessions PHP Filters PHP Filters Advanced PHP Callback Functions PHP JSON PHP Exceptions PHP OOP Get started. Definition and Usage. COLOR PICKER. Learn Python Learn Java Learn C Learn C++ Learn C# Learn R Learn Kotlin Learn Go Learn Django Learn TypeScript. w 3 s c h o o l s C E R T I F I E D. 2 0 2 2. Python . Get certified by completing a course today! W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Tip: Always add the