In some cases, you may want to allow the user to submit the form even if it contains invalid input.To do this, add the novalidate attribute to the form element.For more information, be sure to read the section on Validation.Data validation doesn’t just help to keep your data clean, but it also helps improve the user experience.Filling out forms on the web has never been exactly fun, and it can be downright painful on a mobile device with its on-screen keyboard.
Warnings can be displayed when the users response doesn’t match the expected format.
The API allows you to do things like set a custom error, check whether an element is valid, and determine the reason that an element is invalid.
The table below lists the new Java Script APIs and properties that are available on input elements.
The Java Script validation APIs can provide custom validation logic and prompt users with easy to understand error messages when they’ve provided invalid data.
Remember: Even with client side input validation, it is always important to validate data on the server to ensure consistency and security in your data.