Applies browser compatibility fixes to CSS.

Makes CSS work across browsers by:

1. Adding vendor prefixes for properties that need them
2. Adding standard fallbacks for newer CSS features
3. Adding the .hide-scrollbar modifier as needed

Returns

The CSS with compatibility fixes applied

Extracts critical CSS by identifying and extracting all styles needed for above-the-fold content.

Parameters

• css_content - The full CSS content as a string
• critical_selectors - List of selectors considered critical for above-the-fold content

Returns

A tuple with {critical_css, non_critical_css}

Merges multiple CSS files into one optimized stylesheet.

Parameters

• css_files - Map of {filename, content} pairs
• opts - Options (same as process_for_production)

Returns

The merged and optimized CSS

Processes a CSS file for production by:

1. Adding vendor prefixes for browser compatibility
2. Removing duplicate rules
3. Sorting properties for better diff comparison
4. Minifying the CSS

Parameters

• css_content - The CSS content as a string
• opts - Options for processing:
  • :minify - Whether to minify the output (default: true)
  • :add_prefixes - Whether to add vendor prefixes (default: true)
  • :sort - Whether to sort properties (default: true)
  • :remove_duplicates - Whether to remove duplicates (default: true)

Returns

The processed CSS as a string