A CSS pseudo-element is used to style specified parts of an element. It can be used to style the first letter, or line, of an element and insert content before, or after, the content of an element.

These CSS pseudo-elements allow developers to add decorative content (like icons or small symbols) before or after an element without adding it directly to the HTML.

In fact, Safari 1.1 has added support for three new properties: text-shadow property, rgba () colors with alpha values, and the :selection pseudo-element.