Critical CSS for WP WP Registry grade A. No security issues foundWP RegistryNo security issues foundOpen the reportA

Critical CSS for WP generates and stores critical CSS for published WordPress content using a configurable HTTP API endpoint. It injects the generated CSS inline on the frontend and can defer render-blocking styles when a page has critical CSS available.

Features

• Generates CSS for published posts, pages, and other public post types
• Stores generated CSS in post meta using the _critical_css key
• Injects the CSS inline in the page head via wp_head
• Defers non-critical enqueued styles using the media="print" onload="this.media='all'" pattern
• Supports manual regeneration from the settings screen, bulk actions, and single-post actions
• Uses WP Cron for scheduled regeneration with configurable intervals and thresholds
• Provides a settings page under Settings → Critical CSS

Configuration

1. Activate the plugin.
2. Open Settings → Critical CSS.
3. Set the API URL for the critical CSS service.
4. Select enabled post types.
5. Save the settings and trigger a manual regeneration if needed.

Notes

• The API endpoint is configurable so it can be changed later without changing code.
• The plugin keeps the implementation simple and extendable for future API changes.
• Logs are written to the WordPress debug log when WP_DEBUG and WP_DEBUG_LOG are enabled.