html-presentation

HTML Presentation Skill

Convert documents, outlines, or freeform content into polished, self-contained HTML slide presentations with keyboard and scroll navigation.

When This Skill Triggers

• User provides a document and asks for a "presentation", "slides", or "deck" as HTML
• User asks to convert notes/outline/content into browser-presentable slides
• User wants a Reveal.js or scroll-based HTML presentation
• User references wanting to present from a browser rather than PowerPoint

Step 0: Gather Requirements

Before generating anything, check whether the user has specified the following. If any are missing, ask for clarification in a single concise message. Do NOT ask more than once — use sensible defaults for anything the user declines to specify.

Required context (ask if missing):

Parameter	What to ask	Default if not specified
Navigation mode	"Should slides go left-to-right (horizontal) or top-to-bottom (vertical scroll)?"	horizontal
Theme	"Which visual style? Options: dark-editorial (dark bg, serif headlines, editorial feel), light-minimal (clean white, sans-serif), corporate (navy/white, professional), hacker (terminal green-on-black, monospace)"	dark-editorial
Audience & tone	"Who is this for? (e.g., investors, engineers, conference talk, internal team)"	Infer from content
Slide count preference	"Roughly how many slides?"	Auto-determine from content density
Branding	"Any logo text, tagline, or accent color to use in the header?"	None
CTA / closing	"Any call-to-action, links, or contact info for the final slide?"	None

If the user provides a document and says something like "make this a presentation", ask all missing parameters in one shot. If they say "just make it look good", use defaults and proceed.

Step 1: Analyze the Source Document

Read the uploaded document or provided content. Identify:

1. Logical sections — these become slides or slide groups
2. Key data points — numbers, metrics, percentages → use metric/stat slide layouts
3. Lists and comparisons — feature lists, pros/cons → use card grids or comparison tables
4. Quotes or testimonials — use quote-block layouts
5. Sequential processes — workflows, timelines → use workflow/timeline slide layouts
6. Title and conclusion — first and last slides get special treatment

Create a mental outline mapping content sections to slide types before writing any HTML.

Step 2: Select Slide Layouts

Each slide should use one of these layout patterns. Mix them for visual variety — never use the same layout for more than 2 consecutive slides.

Layout	When to Use	CSS Class
Title	Opening slide, section dividers	slide--section slide--center
Split	Text + supporting content side-by-side	split or split--60-40
Grid Cards	3-6 related items (features, risks, components)	grid-2, grid-3, grid-4
Metrics	Key numbers/stats to emphasize	metrics with metric items
Quote	Expert quotes, testimonials, key statements	quote-block
Workflow	Sequential process, pipeline, architecture	workflow with arrow connectors
Comparison Table	Feature comparison, before/after	comparison-table
Timeline	Chronological events, roadmap phases	timeline
List	Ordered or unordered key points	list, list--check, list--numbered
CTA / Closing	Final slide with links and contact	slide--section slide--center + contact-grid

Step 3: Generate the HTML

Read the appropriate theme and template files from this skill's references directory before writing code:

1. Always read references/THEMES.md to get the CSS variables and styles for the selected theme
2. Always read references/TEMPLATES.md to get the HTML patterns for each slide layout
3. Always read references/NAVIGATION.md to get the correct JS initialization for the selected navigation mode

Then assemble the presentation as a single self-contained HTML file:

File Structure

<!DOCTYPE html>
<html lang="en">
  <head>
    <!-- Meta, fonts, Reveal.js CDN (horizontal) or custom CSS (vertical) -->
    <!-- All styles inline in <style> block -->
  </head>
  <body>
    <!-- Slides markup -->
    <!-- Scripts: Reveal.js init (horizontal) or custom scroll handler (vertical) -->
  </body>
</html>

Key Rules

1. Single file — everything inline. No external CSS/JS files except CDN resources (Google Fonts, Reveal.js, Lucide icons).
2. CDN dependencies (horizontal mode):
   • https://cdn.jsdelivr.net/npm/reveal.js@4.5.0/dist/reveal.css
   • https://cdn.jsdelivr.net/npm/reveal.js@4.5.0/dist/reveal.js
   • https://cdn.jsdelivr.net/npm/reveal.js@4.5.0/plugin/highlight/highlight.js (if code blocks present)
   • https://cdn.jsdelivr.net/npm/reveal.js@4.5.0/plugin/highlight/monokai.css (if code blocks present)
   • https://unpkg.com/lucide@latest (for icons)
3. Vertical scroll mode — zero CDN dependencies for Reveal.js. Uses custom CSS scroll-snap and vanilla JS for keyboard/scroll navigation.
4. Google Fonts — load fonts matching the theme. Always use <link rel="preconnect"> for performance.
5. Responsive — include media queries for 1400px, 1024px, and 768px breakpoints.
6. Fragment animations — use class="fragment" for progressive reveal in horizontal mode. For vertical mode, use intersection observer fade-in animations.
7. Slide numbers — always show current slide number.
8. Kicker text — each content slide gets a numbered kicker like 01 // Section Name for editorial feel.
9. Header bar — each content slide (not title/section slides) gets a header with an icon and section label.

Horizontal Mode: Reveal.js Config

Reveal.initialize({
  hash: true,
  slideNumber: true,
  controls: true,
  controlsLayout: "bottom-right",
  progress: true,
  center: false,
  transition: "slide",
  width: "100%",
  height: "100%",
  margin: 0.04,
  navigationMode: "linear",
  autoAnimate: true,
  autoAnimateDuration: 0.7,
  plugins: [RevealHighlight], // only if code blocks present
});

Vertical Scroll Mode: Navigation Behavior

• Each slide is a full-viewport section with scroll-snap-align: start
• Arrow keys (Up/Down/Left/Right) all navigate between slides
• Mouse wheel scrolls between slides (debounced)
• Page Up/Down, Home/End supported
• Progress bar at bottom shows position
• Smooth scroll transitions between slides
• Touch swipe support for mobile

Step 4: Write to Output

1. Create the HTML file at an appropriate output path (e.g., ./presentation.html or a user-specified location)
2. Present the file to the user

If the content is large (>15 slides), build iteratively — write the skeleton first, then append slide content in chunks.

Error Handling

Problem	Cause	Fix
CDN fails to load (Reveal.js, Lucide, Google Fonts)	Network unavailable or CDN outage	Switch to inline styles/scripts: embed Reveal.js core inline, replace Lucide icons with inline SVG paths, use system font stack (system-ui, -apple-system, sans-serif)
Content overflows slide viewport	Too much text or too many elements per slide	Split the slide into two: move supporting detail to a follow-up slide or convert prose to a bullet list
Fonts render incorrectly or fail to load	Google Fonts CDN blocked or slow	Add system font fallback in the font-family stack: 'Font Name', system-ui, Georgia, serif
Reveal.js fails to initialize	Script load order issue or missing plugin	Verify CDN script tags appear before Reveal.initialize(); check browser console for 404s

Quality Checklist

Before delivering, verify:

• All slides render without overflow (content fits viewport)
• Navigation works with arrow keys AND mouse scroll
• Slide numbers are visible
• Fragment animations work (horizontal) or fade-in works (vertical)
• Links are clickable (pointer-events: auto in Reveal.js)
• Code blocks have syntax highlighting (if present)
• Responsive at all three breakpoints
• No broken icon references (Lucide icons initialized)
• Consistent kicker numbering across all slides
• Title slide and closing slide have distinct visual treatment