John Resig notices that Safari, IE, and Firefox browsers round pixels differently.

Take the following page for example. You have 4 floated divs, each with a width of 25%, contained within a parent div of width 50px. Here’s the question: How wide are each of the divs?

The problem lies in the fact that each div should be, approximately, 12.5px wide and since technology isn’t at a level where we can start rendering at the sub-pixel level we tend to have to round off the number. The problem then becomes: Which way do you round the number? Up, down, or a mixture of the two?

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