I am a programmer and sorry if this sounds stupid.
If I have to specify the same value for both the right and the left property of something, I usually refer it as the SIDE property. Is there a similar generic word to use for a value for both the top and the bottom property?
"The rectangle has 3 pixels left and 3 pixels right margin" = "The rectangle has 3 pixels side margin."
"The image is 40 pixels high and 40 pixels wide" = "The image size is 40 pixels."