UI Coverage is a feature that quantifies how well Cypress tests exercise an application by mapping interactive elements to those actually tested, providing insights into gaps in critical user flows and powering quality gates that can be enforced in CI. To configure UI Coverage effectively, it's essential to apply three stabilizing principles: scoping, identification, and grouping, which involve determining relevant pages, giving unique selectors to functionally distinct elements, and merging functionally identical elements. By applying these principles, UI Coverage's DOM scans can be turned into quality metrics that reflect user journeys, revealing new insights into an app's structure and improving overall testing strategy. Effective configuration of UI Coverage requires thoughtful views, filters, and attribute rules, which can raise the signal-to-noise ratio and yield trustworthy coverage scores, ultimately prompting the addition of clear data-* attributes to make tests more readable and reliable.