CSS
Use when asked to write, explain, or debug CSS — selectors and specificity, the box model, Flexbox/Grid layout, responsive design with media queries, or why a style isn't applying — independent of any specific framework or CSS-in-JS tool.
Lily Design System › Web formats
8 skills.
HTML
Use when asked to write, explain, or debug plain HTML — document structure, semantic elements, forms, accessibility attributes, or how the browser parses and renders markup — independent of any specific framework or templating language.
JSON
Use when asked to write, validate, or debug JSON — syntax rules, JSON Schema validation, JSON Lines (NDJSON), or common serialization pitfalls (numbers, duplicate keys, trailing commas) — independent of any specific language's JSON library.
Markdown
Use when asked to write or fix Markdown formatting — headings, lists, links, tables, code fences, front matter — or to explain differences between CommonMark and GitHub Flavored Markdown (GFM).
SQL
Use when asked to write or debug standard/portable SQL — joins, aggregation, subqueries vs CTEs, transactions, normalization — independent of any specific database vendor. For a vendor's own dialect and tuning specifics, use its own skill (postgresql-database, mysql-database, mssql-database, oracle-database, sqlite-database).
TOML
Use when asked to write, validate, or debug TOML — tables, arrays of tables, inline tables, and TOML's stricter typing versus YAML/JSON — independent of any specific tool's config schema (Cargo.toml, pyproject.toml, etc.).
XML
Use when asked to write, parse, or validate XML — element/attribute syntax, namespaces, XPath queries, or schema validation with XSD/DTD — independent of any specific XML-based format (SVG, RSS, config files) built on top of it.
YAML
Use when asked to write, validate, or debug YAML — indentation-based syntax, anchors/aliases, multi-document files, or common parsing pitfalls (the Norway problem, tabs, string quoting) — independent of any specific tool's YAML dialect (CI config, Kubernetes manifests, etc.).