They may appear in any order. Attribute names are always case-insensitive.
Attribute values are generally case-insensitive.
A single character is used as the value of this attribute. A single, case-insensitive alphanumeric character from a browser's character set. A Radio button that represents a portion of a Radio group will have the same NAME as the other Radio buttons in the group. Low values are navigated first. Positive or negative integers.