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/* pseudo-class: This is a keyword added to a selector that
allows you to select elements based on a particular state.
Common states would include the :hover, :visited and :focus states. */
// these example, these pseudo-class is used to style links that have not be visited by the user.
.my-element:link {
/* properties here */
background-color: red;
}
or
a:link {
background-color: red;
}