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Form validation can be implemented in a number of different ways.

We want to make filling out web forms as easy as possible. There are three main reasons: In the real world, developers tend to use a combination of client-side and server-side validation.

The message is shown to the user when reporting the problem.

If the argument is the empty string, the custom error is cleared.

If the entered data follows all of the specified rules, it is considered valid; if not, it is considered invalid.

Form validation helps us to ensure that users fill out forms in the correct format, making sure that submitted data will work successfully with our applications.

This article leads you through basic concepts and examples about form validation.

For legacy browsers, it's possible to use a polyfill such as Hyperform to compensate for the lack of support for the constraint validation API.

Because you're already using Java Script, using a polyfill isn't an added burden to your website or web application's design or implementation.