[whatwg] Why are form fields without a name barred from constraint validation?

[Bruce Lawson]

"Constraint validation: If an element does not have a name attribute  
specified, or its name attribute's value is the empty string, then it is  
barred from constraint validation."

http://dev.w3.org/html5/spec/forms.html#naming-form-controls

As a matter of interest, why?

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Bruce Lawson
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