2.2.36 [HTML] Section 17.4, The INPUT element

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C0030:

The specification states:

 value = cdata [CA] 
  
 It is optional except when the type attribute has the value "radio" or "checkbox".

All Document Modes (All Versions)

The value attribute is also optional when the type attribute is radio or checkbox. If not defined in the HTML source, the default value is on.

C0031:

The specification states:

 maxlength = number [CN] 
  
 This number may exceed the specified size, in which case the user agent should 
 offer a scrolling mechanism.

All Document Modes (All Versions)

When the value of the maxlength attribute exceeds the value of the size attribute and the text also exceeds the specified size, the user can scroll in the textbox using the arrow keys. There is no scrollbar control.