WordPress 4.7 "Vaughan" — REST API in Core and the Customizer-First Theme

## The REST API Goes Production WordPress 4.7 "Vaughan" is arguably the most important release since WordPress 3.0 introduced custom post types. Two features define it: the REST API content endpoints and the first theme designed around the Customizer. ### REST API Content Endpoints in Core After years of development, the content endpoints for the REST API are officially part of WordPress core. Every post, page, category, tag, comment, and user is now accessible via /wp-json/wp/v2/. No plugins required. This is the moment WordPress officially becomes a headless CMS. Developers can now build any frontend they want — React apps, mobile apps, static sites — all powered by WordPress content through a standard API. ### Twenty Seventeen — Customizer-First Design Twenty Seventeen is the first WordPress theme designed around the Customizer. You set up your entire homepage through the live preview interface: video headers, feature sections, page layouts. No settings pages, no theme options panels — everything happens in the Customizer with real-time preview. ### Custom CSS in the Customizer Site owners can now add custom CSS directly from the Customizer, with live preview and syntax highlighting. No more editing theme files or installing custom CSS plugins. The CSS is stored independently of the theme, so it persists through theme changes. ### Post Type Templates Developers can now create multiple templates for any post type, not just pages. A "portfolio" post type can have different layouts assigned per post. This flexibility was previously only available through custom code. ### PDF Thumbnails WordPress now generates thumbnail previews for uploaded PDF files. The media library shows a visual preview instead of a generic file icon. ### The Numbers WordPress 4.7 shipped to over 27% of the web. That's more than a quarter of all websites running on this single platform. The REST API means all of those sites now have a standard API. The implications for the web ecosystem are enormous.