ReformBox

ReformBox extends WordPress Lightbox functionality beyond images. It currently supports Group, Paragraph, and Video blocks with poster images directly, while delegating Image lightbox behavior to WordPress core. For core/image, ReformBox only syncs the sidebar toggle with core lightbox settings.

Supported Blocks:

• Image Block – Uses WordPress core lightbox behavior (ReformBox panel toggles core lightbox.enabled)
• Video Block – Opens in a lightbox when a poster image is set (poster acts as the click trigger)
• Group Block – Supports both same mode (same content in page + modal) and split mode (separate Preview/Modal direct child Group slots)
• Paragraph Block – Click to open itself in a lightbox

Features:

• No-code lightbox creation via block editor controls
• Core-first image lightbox integration (core/image)
• Core-aligned overlay markup for custom lightboxes
• Core-aligned zoom animation
• ESC key and overlay click to close
• Accessible (ARIA attributes, focus management, keyboard navigation)
• Group split mode with Preview/Modal slot mapping
• Safe split fallback: if no Modal slot is assigned, Preview content is used
• Lazy-loaded assets (CSS/JS only loaded when needed)
• Self-lightbox videos defer preload/autoplay until opened
• Core image workflow integration without overriding core image rendering
• Lightweight and performant

Development

The canonical development repository is:

https://github.com/tbshiki/reformbox

The distributable ZIP also includes the original src/, package.json, and webpack.config.js files so build steps remain auditable.