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In the event of form input being rejected all the information already input can be modified by the user.
Saves the user from having to re-enter information into all the fields and makes it possible to check the original input.
Store all the input information in session variables in order to reuse them when reloading the page.
Fill a field with random information and check that, if the input is rejected, the form is reloaded with all the input information in place and that it is possible to modify it.