ZVON > References > XHTML Reference
    Strict XHTML   

Attribute: alt
Parent: area [Go to standard]
Values: a sequence of characters from the document character set which may include character entities
Parent: img [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