How to change a DIV padding without affecting the width/height ?

Question

I have a div that I want to specify a FIXED width and height for, and also a padding which can be changed without decreasing the original DIV width/height or increasing it,

Answer 1

To achieve a consistent result cross browser, you would usually add another div inside the div and give that no explicit width, and a margin. The margin will simulate padding for the outer div.