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Otherwise, you are allowing attackers to repeatedly attack your application until they find a vulnerability that you haven't protected against.
Detecting attempts to find these weaknesses is a critical protection mechanism.
Because the input type obscures the text typed, you should let the user confirm that they haven't made a mistake.
The simplest way to do this is to have the password entered twice, and then check that they are identical.
Using vanilla Java Script we can prevent form submission as follows: All this does is confirm before submitting the form that the checkbox is checked.
If not, an alert is displayed and focus is moved to the checkbox.
Not the prettiest solution, but functional in all browsers with Java Script enabled.
Adding HTML5 validation to the checkbox is actually very simple.
Some, but not all, browsers will recognise and enforce this: The advantage of the HTML5 form validation is that it happens before our Java Script is called, displays instructions and points the user to the relevant element.In the previous chapter, all input fields were optional.