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

For a rectangle (
shape="rect"
), the formatX1,Y1,X2,Y2
is expected, where the topleft corner is specified byX1, Y1
and the bottomright corner is specified byX2, Y2
, thereforeX1
must be lower thanX2
, andY1
must be lower thanY2
because the coordinates0, 0
start at the topleft.

For a polygon (
shape="poly"
), the formatX1,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 formatX,Y,R
is expected whereX, Y
represents the coordinates of the center of the circle (from the topleft corner), andR
is the radius.
Read more about the <area>
element:
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