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Your doctype is setting the language you’re using and code that’s valid under one doctype may not be valid using another.
For example, you don't want to process a form that's missing critical information.
Therefore, you also have to make sure that the values that users enter can be correctly converted to the appropriate data types.
You might also have certain restrictions on the values.
In that case, the validation is performed as users work in the browser.
For example, suppose you specify that a value should be an integer.