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    <p>If, for example, you're using a <code>%</code> width, and the exact width should be <code>103.333px</code>, then the browser must make a decision on how display that.</p> <p>Different browsers make different decisions, read these links for more information:</p> <ul> <li><a href="http://ejohn.org/blog/sub-pixel-problems-in-css/" rel="nofollow noreferrer">http://ejohn.org/blog/sub-pixel-problems-in-css/</a></li> <li><a href="http://elasticss.com/determination-of-algorithms-used-for-percentage-based-rounding-divs-on-browsers-and-css-frameworks/" rel="nofollow noreferrer">http://elasticss.com/determination-of-algorithms-used-for-percentage-based-rounding-divs-on-browsers-and-css-frameworks/</a></li> </ul> <p>I particularly like this explanation from John Resig/David Baron of why this is even a problem:</p> <blockquote> <p>I was talking this over with some Mozilla developers and David Baron explained the situation quite well:</p> <p><strong>We’re trying to meet a bunch of constraints that can’t all be satisfied at the same time</strong> (the proof is left as an exercise to the reader, though I may have actually written it out once in a Bugzilla comment):</p> <ol> <li><p>4 adjacent objects of width/height 25% (for example) starting at one edge of a container should end exactly at the other edge; there should never be an extra pixel in the container and they should never be wrapped due to being a pixel to wide</p></li> <li><p>objects that are logically adjacent should always touch visually; there should never be a pixel gap or a pixel of overlap due to rounding error</p></li> <li><p>objects given the same width should occupy the same number of pixels</p></li> <li><p>object boundaries should always (visually) be aliased to a specific pixel boundary in the display (they should never be blurred)</p></li> </ol> <p>The one [Mozilla] sacrifices is typically (3), except for borders where we sacrifice (1) by rounding the widths to pixel boundaries much earlier.</p> </blockquote> <p>See this question for a JavaScript fix that forces consistency:</p> <p><a href="https://stackoverflow.com/questions/5115637/evenly-distributed-height-of-child-elements-with-css">Evenly distributed height of child elements with CSS</a></p> <p>Another relevant question:</p> <p><a href="https://stackoverflow.com/questions/4308989/are-the-decimal-places-in-a-css-width-respected">Are the decimal places in a CSS width respected?</a></p>
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