When using CSS to style elements within an HTML document, you must first grab a hold of the specific element(s) you want to style (we call this obtaining a reference). CSS provides several methods for targeting HTML elements for styling. One such method is the use of pseudo-classes, which is selecting HTML elements using some preset combinators provided by CSS. For example, selecting the first or last child elements, or changing the style when the mouse is hovering over an element.
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