:where()
Matches any element in its list of arguments, but always has zero specificity. It is ideal for setting default styles that are intended to be easily overridden.
Quick example
:where(h1, h2, h3) {
/* Sets a default margin that can be overridden by a single class name elsewhere */
margin-top: 2rem;
} :where() Browser Support
Widely available Since 2021 95% global usage
This feature is well established and works across many devices and browser versions. It has been available across browsers since 2021.
Safe to use without fallbacks.
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