Generate frontend ideation concepts using plain HTML, CSS, and JavaScript in `.docs/planning/frontend`. Use for early design exploration, style direction reviews, and multi-concept mockups before framework implementation.
42:T823,
Create low-friction frontend concept explorations for product planning and stakeholder review. Generate production-like frontend prototypes with complete sitemap coverage and navigable flows, but without auth gating.
.docs/planning/frontend as the planning workspace..docs/planning/frontend/brief.md.brutalistcode-terminal-ideminimalistnewspapermid-century-modern1..docs/planning/frontend/sitemap.json..docs/planning/frontend/concepts/<style-folder>/pass-<N>/index.htmlstyle.cssapp.js.html files in each pass folder..docs/planning/frontend/comparison.md with style notes and review prompts.app.js only when it supports concept review..codex/skills/frontend-planning-html/references/default-styles.md when selecting or extending style directions.