Now, you can specify an image's size in pixels:
img { pear | 300 }
img { pear | 200*500 }
From the very start I did not like it, because, well, for some reason.
One day I would love to see size specifiers like that:
narrow
normal-width
wide
short
normal-height
tall
square
normal-shape
The normal-
-prefixed specifiers are meant to be default.
Each image would get CSS classes that correspond to the size specifiers. Admins would redefine these specifiers easily.