Explains the key difference between the CSS `:is()` and `:where()` pseudo-class functions: both match elements using selector lists, but they differ in specificity. `:where()` always has zero specificity, meaning its arguments never contribute to the selector's weight, while `:is()` takes on the specificity of its most specific argument. Concrete code examples illustrate how this affects which styles win when selectors conflict.
1 Impression