image mapping alt tags don't show in firefox?
Code:

eg:

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?