Chapter 3. Selectors
Selectors are the heart of CSS, and although the original CSS1 specification had only 5 or 6, CSS2 expanded the range with 12 more. CSS3 goes further still, roughly doubling the number of available selectors.
Selectors can be broadly separated into two categories. The first are those that act directly on elements defined in the document tree (p elements and href attributes, for example); this category contains class, type, and attribute selectors. For the sake of expediency, I’ll group these together under the banner of DOM selectors. The second category contains pseudo-selectors that act on elements or information that sits ...
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