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Pseudo-classes in CSS
A Guide to CSS Pseudo Classes
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CSS Pseudo-Classes – How the :is Pseudo-Class Works with Examples
Addy Osmani on Twitter: "The CSS :is() pseudo-class is useful for writing repetitive selectors in a more compact form: https://t.co/xsq43qSXYe by @argyleink covers it well! https://t.co/24IM0ijKAm" / Twitter
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