Em seems to be the relative size of the settings for text units, the browser default text height is 16 pixels, for most designers is too big, and not to their liking. To use em, designers typically set the initial size of the text is less than 1em.
For example:
Code:
body (font-size: 0.8em;)
h1 (font-size: 2em;)
p (font-size: 1em;)
May seem feasible, but there is a problem - if you will be in the IE "text size" set to "smaller" or "minimum", the text will be small enough to be difficult to read. Because IE so popular, em does not seem a viable option.
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