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    Transitional XHTML   

Attribute: value
Parent: button [Go to standard]
Values: a sequence of characters from the document character set which may include character entities
Parent: input [Go to standard]
Values: a sequence of characters from the document character set which may include character entities
Parent: li [Go to standard]
Values: at least one digit ([0-9])
Parent: option [Go to standard]
Values: a sequence of characters from the document character set which may include character entities
Parent: param [Go to standard]
Values: a sequence of characters from the document character set which may include character entities