WordPress Interactivity API development for WordPress 6.9+. Use when building interactive block frontends, adding client-side behavior to blocks, implementing modals/dialogs/accordions, creating filters/search with live results, handling forms with validation, enabling client-side navigation (SPA-like), sharing state across multiple blocks, or any frontend interactivity beyond CSS. Covers directives, stores, state management, async patterns, server-side rendering, client navigation with the Interactivity Router, and accessibility.
2026-03-08