CSS Guardrail

CSS Guardrail is a safety tool for WordPress users who edit CSS directly inside the Theme File Editor or the Customizer’s Additional CSS panel.

Before your changes are saved, the plugin scans the CSS for risky rules that could damage the layout, hide content, break navigation, or make the site difficult to use. Serious problems are blocked, while less dangerous issues are shown as warnings so you can review them before continuing.

CSS Guardrail also creates backups of previous CSS versions, making it easy to preview, download, or restore an earlier version when something goes wrong. Its event log records scans, warnings, blocked saves, and rollbacks, giving site owners and developers a clear history of what changed.

The plugin is designed for freelancers, agencies, site administrators, and WordPress users who want the freedom to edit CSS without one small mistake taking down an entire site.

Key features include:

Pre-save CSS scanning Critical and high-risk rule blocking Clear warnings with accurate line numbers Automatic CSS backup history Preview, download, and rollback tools Duplicate-warning detection Activity and event logging Support for the Theme File Editor and Additional CSS No coding workflow changes required

CSS Guardrail does not replace a code editor or write CSS for you. It acts as a final safety check between your CSS changes and the Save button.