Deep dive into advanced selectors: :has(), :is(), :where().

:has() acts as a parent selector. :is() and :where() group selectors; :is() takes highest specificity, :where() has zero specificity.

:has() revolutionizes CSS by applying styles to a parent if it contains a certain child. :is() simplifies long comma-separated lists. :where() does the same but resets specificity to 0, making it incredibly powerful for CSS resets and base library styles.