where (x1,y1) and (x2,y2) are the coordinates of the top left and the bottom right corner, respectively (see example A).
In Example B, (x1,y1) and (x2,y2) are the coordinates of the bottom left and top right corner, respectively. This works fine in Firefox, but not in Konqueror 3.5.9 and SVN trunk rev. 820315.