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    <p>Ems are very relevant for keeping your layout in proportion. 1em is, in digital typography, the size of the design space for each letter and is equivalent to the point size of the font, e.g. if the current font is 12pt then 1em is 12pt.</p> <p>Percentages and Ems are not interchangeable - whilst it may or may not be preferable to specify a font-size relative to the parent as 80% rather than 0.8em, for example, the same doesn't hold true for anywhere else. If I want a 1em margin around an element that's entirely different from specifying 100%, which in that case would be relative to the amount of space the element occupies.</p> <p>Specifying absolute units will throw the design into chaos. If a user chooses to enlarge their font, some browsers may not scale the text - and nor should they, pixel size should be independent of point size. There is also the issue that if you use relative sizes for fonts and absolute sizes for other measurements then your design will probably die a horrible death, so you should therefore specify all measurements relatively where possible, which means using ems. Browsers that confuse "enlarge font size" with "magnify this web page" on the grounds that "the user wants to see everything bigger and it will keep the page how the designer intended" are wrong, no matter how helpful it may seem. It's things like that which caused HTML to be such a huge mess in the first place.</p> <p>I also don't see the merit in specify a body font-size of 62.5% - whilst it may make measurements easier because 1em = 10px, there are a couple of problems. First, you are still technically working in pixels, and secondly it assumes that the user's default font-size is 16px. If you rely on this ratio anywhere in your layout (such as matching image sizes), your design may suffer should the user have a different default font size, and if you are not relying on it and everything is relative then the font-size doesn't matter because everything will scale to match.</p> <p>So yes, ems are still worthwhile.</p>
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