Advanced CSS selector patterns and modern features are explored through practical examples. The difference between :has(:not) and :not(:has) selectors is clarified by expanding implied selectors. Range syntax for style queries enables conditional styling based on custom property values, though with limitations when querying the same element. The box-decoration-break property solves visual issues with wrapped inline elements. Modern CSS units can be combined using functions like min() and round() for more flexible spacing systems.
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