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Local validation on the client machine is much quicker than remote validation on the server. This makes your page more responsive to the user, and users like responsive pages. Also, local validation does not refresh the page, which means the user is not interrupted in filling in the form.

New AJAX technology allows quite rapid server side validation without having to refresh the page. Use it where local validation is not possible - for example checking if a value already exists (or not) on the database.

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Q: Why the forms validations in a HTML page is done using client side language instead of server side language?
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