One requirement of the system font that this page doesn’t mention is that it has to remain readable after clearing half the pixels in a checkerboard pattern (that’s how the OS grayed out menu items that weren’t available). That’s what gives Chicago its unique style: all the vertical stems are two pixels wide.
One requirement of the system font that this page doesn’t mention is that it has to remain readable after clearing half the pixels in a checkerboard pattern (that’s how the OS grayed out menu items that weren’t available). That’s what gives Chicago its unique style: all the vertical stems are two pixels wide.