This is a demo of a required field that must not leave empty.

A demo of checkboxes that must be selected at least two fom any given list.

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A demo for using custom styled messages for error container.

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A demo of select boxes that must be selected at least one fom any given option.

A demo of an email field that is required and must also be a valid email address. It automatically validate an email when the field is in type="email".

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Please choose a username.
Please provide a valid city.
Please select a valid state.
Please provide a valid zip.
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Example invalid feedback text
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Example invalid select feedback