Axioms

• Global Configuration
• Preprocessing Tools
• CSS Custom Properties
• Generic CSS

Elements

• Document-level Elements
• Sectioning
• Grouping Content
• Text-level Semantics
• Edits
• Links
• Embedding
• Tabular Content
• Form-associated Content
• Interactive Elements
• Scripting

Idioms

• Document Structure
• Sectioning
• Navigation

Objects

• Elementary Variants
• Scope-defining Classes

Utilities

• Atomic Utilities
• Layout Utilities
• Coloring Utilities
• Development Utilities