The :where() pseudo selector in CSS is functionally identical to the :is() psuedo selector in that it takes a comma-separated list of selectors to match against, except that where :is() takes the most specific among them as the specificity of …

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Chris Coyier on (Updated on )


The pseudo-select :is() in CSS allows you to write compound selectors more tersely. For example, rather than writing:

ul li,
ol li {}

We could write:

:is(ul, ol) li {}
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Geoff Graham on (Updated on )