They may appear in any order. Attribute names are always case-insensitive. Attribute values are generally case-insensitive. 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. The coordinate system for Client Side Image Maps originates at the top, left corner of the image and values grow larger as you move down and to the right. Positive integers given as a comma separated list of X-Y values. Low values are navigated first.