Resolves what CSS actually applies to a given selector. Returns every property the selector would receive, which rule wins for each property, and which rules were overridden — with confidence levels (certain/likely/possible) since no real DOM is available. Call this before modifying styles for an element to understand the full cascade context first.

Traces a CSS property across all provided files — finding every rule that sets it, grouping competing rules that target overlapping selectors, and showing who wins in each group. Use this to understand the blast radius of a property before changing it, or to find out why a property value isn't applying as expected.