This guide outlines major developer features and breaking changes in 6.9 and is published in the Release Candidate phase to help inform WordPress extending developers, Core developers, and others. There are more than 400 Core Trac tickets included in WordPress 6.9, over 125 of which are enhancements and feature requests, and more than 250 bug…

WordPressCore's platform is a central hub for WordPress developers and contributors, offering insights into WordPress core development, plugin development, and theme customization. Through articles, tutorials, and community forums, WordPressCore offers insights into WordPress architecture, development best practices, and contributing to the WordPress open-source project. Readers can learn about WordPress coding standards, security guidelines, and performance optimization techniques to build powerful and secure websites with WordPress.

Make WordPress Core

WordPress 6.9 introduces block-level collaboration notes, enhanced drag-and-drop editing, and a new WP_Block_Processor for parsing block structures. The release adds new blocks (Math, Accordion, Terms Query), expands the Field API with 10+ field types, and improves DataViews with infinite scroll and custom layouts. Performance optimizations target LCP metrics through on-demand block styles and minified CSS. The Abilities API provides standardized AI integration, while the Interactivity API gains unique ID assignment and improved router support. PHP 8.5 receives beta support, UTF-8 handling becomes environment-independent, and the HTML API gets enhanced serialization. Email handling now supports inline images with cid: references, and apiVersion 3 becomes mandatory for blocks as the editor transitions to iframe architecture in WordPress 7.0.

WordPress 6.9 Field Guide