HTML Checking for Large Sites
Rocket Validator integrates the W3C Validator HTML checker into an automated web crawler.
HTML issues tagged as map.
The coordinates specified for an <area> element using the coords attribute are not in a valid format.

For a rectangle (shape="rect"), the format X1,Y1,X2,Y2 is expected, where the topleft corner is specified by X1, Y1 and the bottomright corner is specified by X2, Y2, therefore X1 must be lower than X2, and Y1 must be lower than Y2 because the coordinates 0, 0 start at the topleft.

For a polygon (shape="poly"), the format X1,Y1,X2,Y2,...,Xn,Yn is expected to contain a list of coordinate pairs (at least 3, for a triangle).

For a circle (shape="circle"), the format X,Y,R is expected where X, Y represents the coordinates of the center of the circle (from the topleft corner), and R is the radius.
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