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HTML5 input types are displayed as simple input fields in older web browsers that do not support these HTML5 features.
The example below shows these HTML5 input types in action.
For example, providing users with the option to check the postal address that they provided can be useful before a purchase is completed.
In some situations, such as validating custom controls or supporting legacy browsers, additional scripting may be necessary to validate user input.
Custom validation needs to notify users in an accessible way as described in the User Notifications part of this tutorial.
Client-side validation alone does not ensure security; therefore data needs to be validated on the server-side as well.
Forms frequently include required input that needs to be clearly identified using labels.