Discuss the use of the ':has()' pseudo-class in CSS.
Instruction: Explain how the ':has()' pseudo-class functions and its potential applications in web design.
Context: Assesses relational CSS selectors, sibling and descendant matching, native validity constraints, and accessible form-state styling.
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:has() matches an element when a relative selector matches from that element. It can test descendants, children, or following siblings: section:has(> h2) selects a section with a direct heading, while label:has(+ input) tests the adjacent input after a label. It is not limited to containment.
:valid means that a control satisfies its constraints, not that it is nonempty...