Q:

WPF color definitions confusion

Why is in WPF the color "Gray" darker then the color "DarkGray".  My logic says that "DarkGray" shoud be darker.  
Should it not be  LightGray, Gray, Darkgray? 

A:

These color names actually come from the CSS Color Module Level 3 W3C Recommendation and the strange definition of Gray and Dark gray actually comes from merging the X11 and web standards.  To quote wikipedia:

Perhaps most unusual of the color clashes between X11 and W3C is the
  case of Gray.  In HTML, Gray is specifically reserved for the 128
  triplet, i.e. 50% gray.  However, in X11, ‘gray’ was assigned to the
  190 triplet, i.e. 75%, which is close to W3C ‘Silver’, and had
  ‘Light Gray’ at 211 and ‘Dark Gray’ at 169 counterparts.  This
  resulted in W3C’s ‘Gray’, at 50%, actually being significantly darker
  than ‘Dark Gray’, at 66%.