As one increases the layout precision of a section on a webpage, all other sections of the page have their layouts perturbed by a proportional amount.
And its corollary:
The more precisely one specifies positioning and layout for a page in one browser, the less accurately every other browser will render it.
Make sure you follow the link and also read his example of a typical exchange between a customer and a web designer. It’s funny because it’s true.
If only we could get customers to read articles like 12 Lessons for Those Afraid of CSS and Standards. Especially “Lesson No. 2: Itâ€™s not going to look exactly the same everywhere unless youâ€™re willing to face some griefâ€¦ and possibly not even then.”