Code:
<xmp>
<map name="Map">
  <area shape="rect" coords="0,200,400,0" href="#" alt="Eyes omg!">
</map>
<img usemap="#Map" width="400" height="200" border="0" src="http://forums.eyesonff.com/images/LeezaA.jpg" />
</xmp>
eg:
<map name="Map">
<area shape="rect" coords="0,200,400,0" href="#" alt="Eyes omg!">
</map>
<img usemap="#Map" width="400" height="200" border="0" src="http://forums.eyesonff.com/images/LeezaA.jpg" />

I'm working with different types of thinking. Some fora say that the coordinates must be x-left, y-top, x-right, y-bottom, and I personally think the coordinates are like the top right section of a cartesian two-dimensional plane (0, 0) being at the bottom left corner, for example.

So according to the x-left y-top / x-right y-bottom thinking, the coordinates 0, 200, 400, 0 should work. It doesn't. I just get a link, and no alt text (in firefox). Why?