Just a small thing - using EM’s means you can get relative sizing of text. This is important if you care about accessability, so when you scale a page up (ctrl + mouse wheel scrolled back) everything looks consistant.
Online, the use of the em measurement has become more common; with the development of Cascading Style Sheets (or CSS), the W3C best practices recommendations within HTML and online markup now call for web pages to be based on scalable designs, using a relative unit of measurement (such as the em measurement), rather than a fixed one such as pixels (”px”) or points.
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