• Writing styles
• Prerequisites
• File formats
• Applying styles to specific sites
• Rule types
• Syntax
• Multiple sites
• Advanced matching with Regular Expressions
• Valid @-moz-document rules
• Domain
• URL
• URL prefix
• RegExp
• Valid examples:
• Invalid examples:
• Preventing global styles
• Embed images in styles
• Selecting specific elements on a page
• Overwriting page styles
• Specificity
• Inline !important
• Replacing images in img tags
• Making a companion style