MDN’s new design is in Beta! A sneak peek: https://blog.mozilla.org/opendesign/mdns-new-design-beta/

In CSS, a pseudo-class selector targets elements depending on their state rather than on information from the document tree. For example, the selector a:visited applies styles only to links that the user has already followed.

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 Contributors to this page: VictorAbdon, JuliaM, klez, Andrew_Pfeiffer
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