CSS3 In-Depth CSS3 In-Depth

Pseudo-elements

While pseudo-classes classes select elements that already exist, pseudo-elements create “faux” elements that you can style. Pseudo elements are often indicated by double-colon notation however for IE support, single colons should be used. It’s a good idea to use Selectivizr along with other JavaScript libraries for backward compatibility. - http://selectivizr.com
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