HTML Presentation Builder

This skill creates an interactive, self-contained HTML presentation from existing project documentation. It transforms Markdown documents into a professional, navigable web presentation with diagrams, collapsible sections, and modern UI.

When to Use This Skill

This skill is a L2 WORKER invoked by ln-100-documents-pipeline orchestrator OR used standalone.

Use this skill when:

• Building HTML presentation from existing documentation
• Rebuilding presentation after documentation updates
• Creating standalone presentation for sharing (no full documentation setup needed)
• Validating that source documentation is ready for presentation generation

Part of workflow: ln-100-documents-pipeline → ln-110-project-docs-coordinator → ln-120-reference-docs-creator → ln-130-tasks-docs-creator → ln-140-test-docs-creator (optional) → ln-150-presentation-creator

Prerequisites: Existing documentation in docs/ directory with required files:

• docs/project/requirements.md (REQUIRED)
• docs/project/architecture.md (REQUIRED)
• docs/project/tech_stack.md (REQUIRED)

Optional files (enhance presentation but not blocking):

• docs/project/api_spec.md, database_schema.md, design_guidelines.md, runbook.md
• docs/reference/adrs/*.md (ADRs with Category: Strategic|Technical)
• docs/reference/guides/*.md (How-to guides)
• docs/tasks/kanban_board.md (Epic Story Counters for Roadmap)

How It Works

The skill follows a 7-phase workflow: READ DOCS → VALIDATE SOURCE EXISTS → VALIDATE SOURCE QUALITY → CREATE DIR → COPY TEMPLATES → INJECT CONTENT → BUILD HTML.

Phase 1: READ DOCS - Load all project documentation from docs/ Phase 2: VALIDATE SOURCE EXISTS - Check required files exist (requirements.md, architecture.md, tech_stack.md), warn if optional missing Phase 3: VALIDATE SOURCE QUALITY - Check diagrams, placeholders, content length (read-only validation) Phase 4: CREATE DIR - Create presentation/ directory + README.md navigation hub Phase 5: COPY TEMPLATES - Copy HTML/CSS/JS templates to assets/ Phase 6: INJECT CONTENT - Parse MD docs → replace placeholders in tab files → delete example blocks Phase 7: BUILD HTML - Assemble modular components into standalone presentation_final.html

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Phase 1: Read Documentation

Objective: Load all project documentation for transformation.

When to execute: Always (first phase)

Process:

1. Use docs/ as source:

   • Read documentation from docs/project/, docs/reference/, docs/tasks/ directories
   • Standard locations created by ln-114, ln-112, ln-113

2. Read Core MD Documents:

   • project/requirements.md - Functional Requirements
   • project/architecture.md - Architecture design, C4 diagrams
   • project/tech_stack.md - Technology versions, Docker configuration
   • project/api_spec.md - API endpoints, authentication (if exists)
   • project/database_schema.md - Database schema, ER diagrams (if exists)
   • project/design_guidelines.md - UI/UX design system (if exists)
   • project/runbook.md - Operational procedures (if exists)

3. Read ADRs (if exist):

   • reference/adrs/adr-001-*.md through adr-NNN-*.md
   • Parse ADR metadata (status, date, title, Category: Strategic|Technical)

4. Read Guides (if exist):

   • reference/guides/*.md - How-to guides for Guides tab

5. Read Kanban Board (if exists):

   • tasks/kanban_board.md - Epic Story Counters table for Roadmap progress

6. Extract metadata:

   • Project name, date, version from documents
   • Preserve Mermaid diagram blocks

Output: Loaded documentation data ready for validation and HTML generation

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Phase 2: Validate Source Documentation Exists

Objective: Verify that required source documentation exists before building presentation. Prevent building incomplete presentations.

When to execute: After Phase 1 (documentation loaded)

Process:

2.1 Check required files

REQUIRED (must exist - block execution if missing):

• ✅ docs/project/requirements.md
• ✅ docs/project/architecture.md
• ✅ docs/project/tech_stack.md

For each required file:

1. Use Glob tool: pattern: "docs/project/{filename}"
2. If NOT found:
   • Add to missing list
3. If found:
   • Check file size > 100 bytes (not empty)

If ANY required file missing or empty:

❌ ERROR: Cannot build presentation - missing required documentation:
  - docs/project/requirements.md [missing/empty]
  - docs/project/architecture.md [missing/empty]

Suggestion: Run ln-111-project-docs-creator to create missing files.

STOP execution.

2.2 Check optional files

OPTIONAL (enhance presentation - warn if missing but continue):

• ⚠️ docs/project/api_spec.md (for backend projects)
• ⚠️ docs/project/database_schema.md (for projects with database)
• ⚠️ docs/project/design_guidelines.md (for frontend projects)
• ⚠️ docs/project/runbook.md (for operational projects)

For each optional file:

1. Use Glob tool: pattern: "docs/project/{filename}"
2. If NOT found:
   • Add to optional missing list

If optional files missing:

⚠ WARN: Optional files missing: [list]
Presentation will have reduced content in some tabs.
Continue execution.

2.3 Check optional directories

OPTIONAL directories:

• docs/reference/adrs/ - check if any ADR files exist (adrs/*.md)
• docs/reference/guides/ - check if any guide files exist (guides/*.md)
• docs/tasks/kanban_board.md - check for Roadmap data

For each directory:

1. Use Glob tool to find files
2. If empty/missing:
   • Log: ℹ Optional directory empty: {directory} - related tab will show placeholder

2.4 Report validation summary

Log summary:

✓ Source documentation validation completed:
  Required files:
    - ✅ requirements.md (found, 8.5 KB)
    - ✅ architecture.md (found, 15.2 KB)
    - ✅ tech_stack.md (found, 3.1 KB)
  Optional files:
    - ⚠️ api_spec.md (missing - Technical Spec tab will have reduced content)
    - ✅ database_schema.md (found, 4.7 KB)
    - ⚠️ design_guidelines.md (missing)
  Optional directories:
    - ✅ adrs/ (5 ADR files found)
    - ⚠️ guides/ (empty - Guides tab will show placeholder)
    - ✅ kanban_board.md (found - Roadmap will show progress)

Output: Validation passed (all required files exist) OR error (stop execution)

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Phase 3: Validate Source Content Quality

Objective: Verify source docs contain sufficient content. Warn about incomplete content but don't block execution.

When to execute: After Phase 2 (source files exist)

Checks performed (warnings only, non-blocking):

1. Mermaid diagrams: architecture.md must have ≥1 diagram, database_schema.md must have ER diagram
2. Placeholders: Detect {{PLACEHOLDER}}, [Add your ...], TODO: patterns
3. Content length: requirements.md >500 words, architecture.md >1000 words, tech_stack.md >200 words

Auto-fix: None - ln-115 is read-only. Run ln-111-project-docs-creator to fix issues.

Output: Content quality report with warnings

📖 Detailed workflow: See references/phases_detailed.md

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Phase 4: Create Presentation Directory & README

Objective: Setup presentation directory structure and navigation hub.

When to execute: After Phase 3 (source validation complete, warnings logged)

Process:

1. Create presentation directory:

   mkdir -p docs/presentation/
   

2. Check if presentation/README.md exists:

   • Use Glob tool: pattern: "docs/presentation/README.md"
   • If file exists:
     • Skip creation
     • Log: ✓ docs/presentation/README.md already exists (preserved)
     • Proceed to Phase 5
   • If NOT exists:
     • Continue to step 3

3. Create presentation/README.md from template:

   • Copy template: references/presentation_readme_template.md → docs/presentation/README.md
   • Replace placeholders:
     • {{PROJECT_NAME}} — from requirements.md
     • {{LAST_UPDATED}} — current date (YYYY-MM-DD)
   • Content structure:
     • Purpose: What is this presentation
     • Quick Navigation: Links to presentation_final.html and assets/
     • Customization Guide: How to edit source files in assets/
     • Build Instructions: How to rebuild after changes
     • Maintenance: When to rebuild, verification checklist

4. Notify user:

   • If created: ✓ Created docs/presentation/README.md (navigation hub)
   • If skipped: ✓ docs/presentation/README.md already exists (preserved)

Output: docs/presentation/README.md (created or existing)

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Phase 5: Copy Templates to Project

Objective: Copy HTML/CSS/JS templates from skill references/ to presentation directory.

When to execute: After Phase 4 (presentation directory exists)

Process:

1. Check if assets exist:

   • Use Glob tool: pattern: "docs/presentation/assets/"
   • If docs/presentation/assets/ exists:
     • Skip copying (user may have customized files)
     • Log: ✓ Presentation assets already exist - preserving user customizations
     • Proceed to Phase 6
   • If NOT exists:
     • Continue to step 2

2. Copy template files:

   cp references/presentation_template.html → docs/presentation/assets/
   cp references/styles.css → docs/presentation/assets/
   cp references/scripts.js → docs/presentation/assets/
   cp references/build-presentation.js → docs/presentation/assets/
   cp -r references/tabs/ → docs/presentation/assets/tabs/
   

3. Verify copied structure:

   docs/presentation/assets/
   ├── presentation_template.html   # Base HTML5 + 6 tab navigation
   ├── styles.css                    # ~400-500 lines
   ├── scripts.js                    # Tab switching + Mermaid init
   ├── build-presentation.js         # Node.js build script
   └── tabs/
       ├── tab_overview.html         # Landing page
       ├── tab_requirements.html     # FRs + ADRs
       ├── tab_architecture.html     # C4 diagrams
       ├── tab_technical_spec.html   # API + Data + Deployment
       ├── tab_roadmap.html          # Epic list
       └── tab_guides.html           # How-to guides
   

Output: Template files copied to docs/presentation/assets/ (or skipped if already exist)

Note: Templates contain placeholders ({{VARIABLE_NAME}}) that will be replaced in Phase 6.

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Phase 6: Content Injection & Example Cleanup

Objective: Parse MD docs, inject into HTML templates, remove example blocks.

When to execute: After Phase 5 (templates exist in assets/)

Process:

1. Parse MD docs (10 sources): requirements, architecture, tech_stack, api_spec, database_schema, design_guidelines, runbook, adrs/.md, kanban_board, guides/.md
2. Inject content: Replace {{PLACEHOLDER}} in 6 tab files with parsed content
3. Delete examples: Remove <!-- EXAMPLE START -->...<!-- EXAMPLE END --> blocks from all tabs

Tab placeholders: Overview (5), Requirements (4 + NFR ban), Architecture (5), Technical Spec (4), Roadmap (3), Guides (6)

Validation: No example markers, no hardcoded e-commerce data, only project-specific content

Output: Clean, project-specific tab files ready for build

📖 Placeholder reference & example transformation: See references/phases_detailed.md

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Phase 7: Build Final Presentation

Objective: Assemble modular components into standalone HTML file.

When to execute: After Phase 6 (content injected, examples deleted)

Process:

1. Check if presentation_final.html exists (Auto-rebuild for automation):

   • Use Glob tool: pattern: "docs/presentation/presentation_final.html"
   • If file exists:
     • ✓ Auto-rebuild (generated file, safe operation)
     • Log: ℹ Rebuilding presentation_final.html (generated file, safe to rebuild)
     • Continue to step 2
   • If NOT exists:
     • Log: Creating presentation_final.html
     • Continue to step 2

   Why auto-rebuild:

   • presentation_final.html is a generated file (source of truth: assets/ directory)
   • Rebuilding is safe - no data loss (source files preserved in assets/)
   • Maintains fully automatic workflow when invoked by ln-110-documents-pipeline
   • User customizations in assets/ are preserved (only final HTML is regenerated)

2. Navigate to presentation assets directory:

   cd docs/presentation/assets/
   

3. Run build script:

   node build-presentation.js
   

4. Build Script Process:

   • Step 1: Read presentation_template.html
   • Step 2: Read and inline styles.css → <style> tag
   • Step 3: Read and inline scripts.js → <script> tag
   • Step 4: Read all 6 tab files → inject into empty <div> containers
   • Step 5: Replace {{PLACEHOLDERS}} with actual values
   • Step 6: Write ../presentation_final.html

5. Validate Output (only if file was built):

   • Check file size (~120-150 KB expected)
   • Verify Mermaid diagrams syntax is valid
   • Log: ✓ Build completed successfully

6. Notify user:

   • If rebuilt (file existed): ✓ Rebuilt docs/presentation/presentation_final.html (~120-150 KB)
   • If created (file NOT existed): ✓ Created docs/presentation/presentation_final.html (~120-150 KB)
   • Remind: Test in browser: Double-click to open, or use http-server

Output: docs/presentation/presentation_final.html (self-contained, ~120-150 KB, no external dependencies except Mermaid.js CDN)

⚠️ Important Note:

presentation_final.html is a generated file built from modular source files in assets/.

• ❌ DO NOT edit presentation_final.html directly — changes will be lost on next rebuild
• ✅ DO edit source files in assets/ directory (template, tabs, styles, scripts)
• 🔄 Rebuild after changes: cd assets/ && node build-presentation.js

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Complete Output Structure

docs/
├── project/                      # Source documentation (input)
│   ├── requirements.md
│   ├── architecture.md
│   ├── tech_stack.md
│   ├── api_spec.md (conditional)
│   ├── database_schema.md (conditional)
│   ├── design_guidelines.md (conditional)
│   └── runbook.md (conditional)
├── reference/                    # Source documentation (input)
│   ├── adrs/
│   │   └── *.md (Category: Strategic | Technical)
│   └── guides/
│       └── *.md (optional)
├── tasks/                        # Source documentation (input)
│   └── kanban_board.md (Epic Story Counters)
└── presentation/                 # Output directory
    ├── README.md                 # Navigation hub
    ├── presentation_final.html   # Final standalone HTML (~120-150 KB)
    └── assets/                   # Modular HTML structure
        ├── presentation_template.html  # Base HTML5 + 6 tabs
        ├── styles.css                  # ~400-500 lines
        ├── scripts.js                  # Tab switching + Mermaid
        ├── build-presentation.js       # Node.js build script
        └── tabs/
            ├── tab_overview.html       # Landing page
            ├── tab_requirements.html   # FRs + ADRs
            ├── tab_architecture.html   # C4 diagrams
            ├── tab_technical_spec.html # API + Data + Deployment
            ├── tab_roadmap.html        # Epic list
            └── tab_guides.html         # How-to guides

Note: Presentation READS from docs/project/, docs/reference/, docs/tasks/ but OUTPUTS to docs/presentation/.

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HTML Features

• Single Source of Truth: No information duplication - each piece lives in exactly ONE tab
• Landing Page (Overview): Problem/Solution/Business Value, Stakeholders, Documentation Guide, Quick Facts, Tech Stack badges
• Interactive Navigation: 6 tabs with SCOPE tags, state persistence (localStorage), smooth transitions
• Table-Based Layout: FRs table only (Non-Functional Requirements are forbidden), Architecture highlights table
• Roadmap Simplified: Vertical Epic list with In/Out Scope sections, status badges, Dependencies/Success Criteria
• ADR Organization: Grouped by category (Strategic/Technical) with accordion, full content inline
• Diagram Visualization: Mermaid.js with tab-switch rerender (C4, ER, Sequence, Deployment)
• Responsive Design: Mobile-first (320px/768px/1024px+ breakpoints)
• Collapsible Sections: Auto-collapse with scroll preservation
• Modern UI: Clean professional design, WCAG 2.1 Level AA compliant
• English Language: All presentation content in English

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Best Practices

Idempotent operation: Preserves README.md, preserves assets/ (user customizations), auto-rebuilds presentation_final.html.

Key rules by phase:

• Phase 2: STOP if required files missing; Phase 3: WARN only (non-blocking)
• Phase 5: Don't overwrite existing assets (user customizations)
• Phase 6: Delete ALL example blocks, escape XSS, valid Mermaid syntax
• Phase 7: Warn if output >200 KB

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Customization Options

Edit assets/styles.css (CSS variables for theming), assets/presentation_template.html (layout/tabs), or assets/tabs/*.html (tab content).

⚠️ After any customization: Always rebuild the presentation:

cd assets/
node build-presentation.js

Important: Never edit presentation_final.html directly — it's a generated file that gets overwritten on each build.

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Prerequisites

Orchestrator: ln-110-documents-pipeline | Standalone: Yes (rebuild/validate existing docs)

Required files: requirements.md, architecture.md, tech_stack.md (in docs/project/) Optional files: api_spec, database_schema, design_guidelines, runbook, adrs/.md, guides/.md, kanban_board.md

Dependencies: Node.js v18+, Modern browser, Internet (Mermaid CDN)

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Definition of Done

Phase	Critical Checkpoints
1. READ DOCS	✅ All docs loaded from docs/project/, docs/reference/, docs/tasks/ ✅ Metadata extracted ✅ Mermaid blocks preserved
2. VALIDATE EXISTS	✅ Required files exist (requirements.md, architecture.md, tech_stack.md) ✅ ERROR if missing
3. VALIDATE QUALITY	✅ Diagrams checked ✅ Placeholders detected ✅ Content length checked ✅ WARN only (non-blocking)
4. CREATE DIR	✅ docs/presentation/ created ✅ README.md created/preserved
5. COPY TEMPLATES	✅ assets/ created with all templates OR preserved if exists
6. INJECT CONTENT	✅ All 6 tabs populated ✅ CRITICAL: Example blocks deleted ✅ No <!-- EXAMPLE --> markers ✅ No hardcoded e-commerce data
7. BUILD HTML	✅ node build-presentation.js executed ✅ presentation_final.html created (~120-150 KB) ✅ Tested in browser

Output: docs/presentation/presentation_final.html + assets/ + README.md

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Troubleshooting

• ERROR: Missing required files: Run ln-111-project-docs-creator to create requirements.md, architecture.md, tech_stack.md
• WARN: Missing diagrams: Add Mermaid diagrams to architecture.md (C4 Context/Container/Component) and database_schema.md (ER diagram)
• WARN: Placeholders found: Complete documentation in source MD files before building
• WARN: Sparse content: Expand documentation (requirements.md >500 words, architecture.md >1000 words, tech_stack.md >200 words)
• Build script fails: Check Node.js v18+, navigate to assets/, verify all files exist
• Mermaid diagrams not rendering: Check syntax with Mermaid Live Editor, verify CDN loaded
• Tabs not switching: Check JavaScript loaded, open browser console for errors
• File too large (>200 KB): Reduce diagrams, minify CSS/JS, remove unused rules

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Version: 8.0.0 Last Updated: 2025-12-12