Feature 3: Visual debugging

[danielguillan]

Add a visual debugger mixin that adds an outline to target elements.

• [x] Debugger mixin
• [x] Test HTML
• [x] Docs

---

Available targets are:

• classes
• modifiers
• elements
• objects
• components
• utilities
• hacks

Usage:

@include bem-debug($targets...)

Example:

@include bem-debug('modifiers', 'components'); // Outlines all modifiers and components

Use it empty to outline all target types: @include bem-debug();