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Slight differences in browser display: CSS is difficult for browser makers to implement, and the W3C recommendations can be vague and confusing. So you can expect even the most recent browsers to behave differently when dealing with some aspects of CSS layout. Keep your layout simple enough and you will likely get a nearly identical display in Opera 5+, NS6, and IE5+. But as your layout increases in complexity, the odds that different browsers will render pages differently also increases.