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Selectors define which part(s) of your (X)HTML document will be affected by the declarations you’ve specified. Several types of selectors are available in CSS. Note that some of them are not supported in all browsers. Element Selectors The most basic of all selectors is the element selector (you may have heard them called tag selectors).
10 Great CSS Selectors you must know
5 Ways to Instantly Write Better CSS
CSS Sprites are not new. In fact, they are a rather well-established technique and have managed to become common practice in Web development. Of course, CSS sprites are not always necessary, but in some situation they can bring significant advantages and improvements – particularly if you want to reduce your server load.

