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One of the features of HTML5 is the ability to validate most user data without relying on scripts.This is done by using validation attributes on form elements, which allow you to specify rules for a form input like whether a value needs to be filled in, the minimum and maximum length of the data, whether it needs to be a number, an email address, or something else, and a pattern that it must match.
If correct, the application allows the data to be submitted to the server and (usually) saved in a database; if not, it gives you an error message explaining what corrections need to be made.
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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 will tell you what you need to know about form validation.
Placing the error in a label will cause a screen reader to speak each error as the user tabs through the form fields.