Best Outliner CSS Alternatives in 2026

About Outliner CSS

Outliner CSS: Your Perfect Debugging Tool Outline every element to instantly debug layout and spacing, depth tinting, per-site memory, one-click selector copy. Key Features: - One-click outlines in five colours - Depth tinting to visualise nesting - Hover to inspect, click to copy the selector - Alt+Shift+O toggles the current page - Your colour preferences sync, nothing about the sites you visit is ever stored - No trackers, no external requests What's new in 3.1 - Depth tinting fixed (silently broken in 3.0) - DOM structure mode rebuilt: dashed context outlines, solid hover highlight, click-to-copy selectors - New: keyboard shortcut and synced colour preferences - Redesigned popup with automatic dark mode - No site-access permissions and no stored site records: acts only when you invoke it, remembers only your colours Lightweight by design: one injected stylesheet-style sweep, no trackers, no analytics, no external requests.