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VALUES AND SIZING
Much of CSS3, from its many new selectors to layout and font properties, is designed to give you more granular control over presentation than was available in CSS2.1. That control will be even more evident in this chapter, as I introduce new value functions and units, as well as methods to calculate dimensions automatically.
Relative Length Units
In CSS a relative length unit is one whose value is relative to another property. The two relative units in CSS2.1 are em, which is calculated from the font-size property of an element, and ex, which is calculated from the x-height of the element’s font (see “font-size-adjust” on ...
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