| name | css-grid-math |
| description | Derive and debug CSS Grid layout math for grid coordinates, line placement, spans, negative indexes, fr units, minmax(), fit-content(), repeat(), auto-fill, and auto-fit. Use when building grid systems, explaining track sizing, troubleshooting fr distribution, placing items by line numbers, or converting a layout sketch into CSS Grid formulas. |
| license | MIT |
| compatibility | Codex, Claude Code, and other Agent Skills-compatible clients. |
| metadata | {"version":"0.1.0","displayName":"CSS Grid Math","category":"Frontend","tags":"frontend,css,grid,layout,math"} |
CSS Grid Math
Use this skill when a grid needs to be reasoned about as a coordinate and sizing system. It helps calculate where items land, how tracks divide space, and why flexible tracks do not always produce expected widths.
Quick Start
- Read
guidelines.md to select the smallest relevant file set.
- Load
references/grid-layout/rules.md for implementation decisions.
- Load
references/grid-layout/examples.md when editing code.
- Use
workflows/debug-grid-layout.md for multi-step derivation or debugging.
Contents
| Resource | Purpose |
|---|
guidelines.md | Routes tasks to the right reference files |
references/source-map.md | Book source and chapter/section traceability |
references/grid-layout/knowledge.md | Core concepts and terminology |
references/grid-layout/rules.md | Practical rules, guidelines, and exceptions |
references/grid-layout/examples.md | Bad/good examples and refactoring approach |
references/grid-layout/patterns.md | Reusable formula and implementation patterns |
references/grid-layout/checklist.md | Review checklist and red flags |
workflows/debug-grid-layout.md | Step-by-step workflow |
Source
Derived from Math for Web Design by Paul McFedries, Chapter 4: CSS Grid math.
Citations are tracked in references/source-map.md.
