An element is classified as a pseudo-class based on its present state, location, or function in a document.
An element's unique state is defined by a pseudo-class. To style an element when a user hovers their mouse over it, for instance Link styles between visited and unvisited pages differ.
When it loses attention, the color turns back. The:first-child pseudo-class provides a custom style to an element that matches a given element that is the first child of another element. Declare:first-child at the top of the document for it to function properly in IE.
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