Why margin:2.5px does not work? How to solve this problem

Question

Why margin:2.5px does not work? at one situation in my code i want to give margin:2.5px in IE6 conditional CSS to solve IE double margin and my default css has margin:5px but in IE6 css margin:2.5px and margin:2px creating same margin. then how to get same margin on both browser?

This is code of default screen CSS

    #newsHeadline LI 
{font-weight: bold; 
list-style-position: inside; 
font-size: 13px;
margin: 5px 0px;
width: 320px; 
line-height:
normal; list-style-type: disc; 
position: relative}

this is css code in conditional i'm writing #newsHeadline LI {margin: 2.5px 0px}

Edit: 15 feb

if margin:2.5px does not work then how to get same margin in both browser IE and FF? Is there any other way?

Answer 1

While plenty of people have suggested that the pixel is indivisible, and therefore a fractional pixel value makes no sense, the CSS standard does not actually rule out fractional values. Indeed, it suggests that when a high-resolution device is used, a CSS pixel unit should be mapped to a larger number of device-specific elements. My reading is therefore that 2.5px should not be explicitly wrong, just that you might not be able to rely on it to do something useful, especially, I might say, in Internet Explorer.

Answer 2

Because px is the smallest unit possible. U really can't divide one display point, can you?

Edit: AS for your problem, if there is no interference with background (i.e. different color), you can try setting padding instead of margin for IE6.