Term Kind Topic What it is
Component Library Versioning practice Design Systems Treating a design system as a versioned product with a compatibility policy and a deprecation process, because its consumers cannot all upgrade at once.
Focus Management practice Accessibility Architecture Deliberately controlling where keyboard focus sits after an interface change, which is what makes a dynamic application usable without a mouse.
Locale Aware Formatting practice Internationalisation Rendering dates, numbers, currencies and names according to the user's locale rather than the developer's, using the platform rather than hand-written logic.
Performance Budget Enforcement practice Web Performance Budgets A stated limit on bundle size or a timing metric that fails a build when exceeded, which is what turns performance from a periodic project into a constraint.