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Forms: validation, styling & semantics

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Name must be at least 2 words

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An optional field. This field is only validated when it has a value.
Minimum 5 chars, maximum 15

(optional)
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This field uses HTML5 "pattern" attribute to be validated.
"\d+" - only digits are allowed

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Number must be between 10 and 100

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Should be of length 6 OR 8 characters

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Notice that for a phone number user can input a '+' sign, a dash '-' or a space ' '

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Choose something or choose not. what shall it be?

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This is a multifield, which let the user input a serial number or credit card number for example, and the trick is to validate the combined result, which is stored in a hidden field

There is a hidden "required" form field below, notice it will not be validated due to its lack of visibility.
The reason for this is that sometimes there is a section in a form that is not visible until some user "action" is taken, and changing form fields to be "required" on-the-fly is undesirable.