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# HTML Presentation Template
Reference architecture for generating slide presentations. Every presentation follows this structure.
## Base HTML Structure
```html
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Presentation Title</title>
<!-- Fonts: use Fontshare or Google Fonts — never system fonts -->
<link rel="stylesheet" href="https://api.fontshare.com/v2/css?f[]=..." />
<style>
/* ===========================================
CSS CUSTOM PROPERTIES (THEME)
Change these to change the whole look
=========================================== */
:root {
/* Colors — from chosen style preset */
--bg-primary: #0a0f1c;
--bg-secondary: #111827;
--text-primary: #ffffff;
--text-secondary: #9ca3af;
--accent: #00ffcc;
--accent-glow: rgba(0, 255, 204, 0.3);
/* Typography — MUST use clamp() */
--font-display: "Clash Display", sans-serif;
--font-body: "Satoshi", sans-serif;
--title-size: clamp(2rem, 6vw, 5rem);
--subtitle-size: clamp(0.875rem, 2vw, 1.25rem);
--body-size: clamp(0.75rem, 1.2vw, 1rem);
/* Spacing — MUST use clamp() */
--slide-padding: clamp(1.5rem, 4vw, 4rem);
--content-gap: clamp(1rem, 2vw, 2rem);
/* Animation */
--ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
--duration-normal: 0.6s;
}
/* ===========================================
BASE STYLES
=========================================== */
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
/* --- PASTE viewport-base.css CONTENTS HERE --- */
/* ===========================================
ANIMATIONS
Trigger via .visible class (added by JS on scroll)
=========================================== */
.reveal {
opacity: 0;
transform: translateY(30px);
transition:
opacity var(--duration-normal) var(--ease-out-expo),
transform var(--duration-normal) var(--ease-out-expo);
}
.slide.visible .reveal {
opacity: 1;
transform: translateY(0);
}
/* Stagger children for sequential reveal */
.reveal:nth-child(1) {
transition-delay: 0.1s;
}
.reveal:nth-child(2) {
transition-delay: 0.2s;
}
.reveal:nth-child(3) {
transition-delay: 0.3s;
}
.reveal:nth-child(4) {
transition-delay: 0.4s;
}
/* ... preset-specific styles ... */
</style>
</head>
<body>
<!-- Optional: Progress bar -->
<div class="progress-bar"></div>
<!-- Optional: Navigation dots -->
<nav class="nav-dots"><!-- Generated by JS --></nav>
<!-- Slides -->
<section class="slide title-slide">
<h1 class="reveal">Presentation Title</h1>
<p class="reveal">Subtitle or author</p>
</section>
<section class="slide">
<div class="slide-content">
<h2 class="reveal">Slide Title</h2>
<p class="reveal">Content...</p>
</div>
</section>
<!-- More slides... -->
<script>
/* ===========================================
SLIDE PRESENTATION CONTROLLER
=========================================== */
class SlidePresentation {
constructor() {
this.slides = document.querySelectorAll(".slide");
this.currentSlide = 0;
this.setupIntersectionObserver();
this.setupKeyboardNav();
this.setupTouchNav();
this.setupProgressBar();
this.setupNavDots();
}
setupIntersectionObserver() {
// Add .visible class when slides enter viewport
// Triggers CSS animations efficiently
}
setupKeyboardNav() {
// Arrow keys, Space, Page Up/Down
}
setupTouchNav() {
// Touch/swipe support for mobile
}
setupProgressBar() {
// Update progress bar on scroll
}
setupNavDots() {
// IMPORTANT: Always clear before building — if outerHTML was
// captured while dots were rendered, re-opening the file would
// append a duplicate set on top of the existing ones.
this.navDotsContainer.innerHTML = "";
// Generate and manage navigation dots
}
}
new SlidePresentation();
</script>
</body>
</html>
```
## Required JavaScript Features
Every presentation must include:
1. **SlidePresentation Class** — Main controller with:
- Keyboard navigation (arrows, space, page up/down)
- Touch/swipe support
- Mouse wheel navigation
- Progress bar updates
- Navigation dots
2. **Intersection Observer** — For scroll-triggered animations:
- Add `.visible` class when slides enter viewport
- Trigger CSS transitions efficiently
3. **Optional Enhancements** (match to chosen style):
- Custom cursor with trail
- Particle system background (canvas)
- Parallax effects
- 3D tilt on hover
- Magnetic buttons
- Counter animations
4. **Inline Editing** (only if user opted in during Phase 1 — skip entirely if they said No):
- Edit toggle button (hidden by default, revealed via hover hotzone or `E` key)
- Auto-save to localStorage
- Export/save file functionality
- See "Inline Editing Implementation" section below
## Inline Editing Implementation (Opt-In Only)
**If the user chose "No" for inline editing in Phase 1, do NOT generate any edit-related HTML, CSS, or JS.**
**Do NOT use CSS `~` sibling selector for hover-based show/hide.** The CSS-only approach (`edit-hotzone:hover ~ .edit-toggle`) fails because `pointer-events: none` on the toggle button breaks the hover chain: user hovers hotzone -> button becomes visible -> mouse moves toward button -> leaves hotzone -> button disappears before click.
**Required approach: JS-based hover with 400ms delay timeout.**
HTML:
```html
<div class="edit-hotzone"></div>
<button class="edit-toggle" id="editToggle" title="Edit mode (E)">Edit</button>
```
CSS (visibility controlled by JS classes only):
```css
/* Do NOT use CSS ~ sibling selector for this!
pointer-events: none breaks the hover chain.
Must use JS with delay timeout. */
.edit-hotzone {
position: fixed;
top: 0;
left: 0;
width: 80px;
height: 80px;
z-index: 10000;
cursor: pointer;
}
.edit-toggle {
opacity: 0;
pointer-events: none;
transition: opacity 0.3s ease;
z-index: 10001;
}
.edit-toggle.show,
.edit-toggle.active {
opacity: 1;
pointer-events: auto;
}
```
JS (three interaction methods):
```javascript
// 1. Click handler on the toggle button
document.getElementById("editToggle").addEventListener("click", () => {
editor.toggleEditMode();
});
// 2. Hotzone hover with 400ms grace period
const hotzone = document.querySelector(".edit-hotzone");
const editToggle = document.getElementById("editToggle");
let hideTimeout = null;
hotzone.addEventListener("mouseenter", () => {
clearTimeout(hideTimeout);
editToggle.classList.add("show");
});
hotzone.addEventListener("mouseleave", () => {
hideTimeout = setTimeout(() => {
if (!editor.isActive) editToggle.classList.remove("show");
}, 400);
});
editToggle.addEventListener("mouseenter", () => {
clearTimeout(hideTimeout);
});
editToggle.addEventListener("mouseleave", () => {
hideTimeout = setTimeout(() => {
if (!editor.isActive) editToggle.classList.remove("show");
}, 400);
});
// 3. Hotzone direct click
hotzone.addEventListener("click", () => {
editor.toggleEditMode();
});
// 4. Keyboard shortcut (E key, skip when editing text)
document.addEventListener("keydown", (e) => {
if (
(e.key === "e" || e.key === "E") &&
!e.target.getAttribute("contenteditable")
) {
editor.toggleEditMode();
}
});
```
**CRITICAL: `exportFile()` must strip edit state before capturing outerHTML.**
When the user presses Ctrl+S in edit mode, `document.documentElement.outerHTML` captures the live DOM —
including `body.edit-active`, `contenteditable="true"` on every text element, and `.active`/`.show` classes on
the toggle button and banner. Anyone opening the saved file sees dashed outlines, a checkmark button, and an
edit banner, as if permanently stuck in edit mode.
Always implement `exportFile()` like this:
```javascript
exportFile() {
// Temporarily strip edit state so the saved file opens cleanly
const editableEls = Array.from(document.querySelectorAll('[contenteditable]'));
editableEls.forEach(el => el.removeAttribute('contenteditable'));
document.body.classList.remove('edit-active');
// Also strip UI classes from toggle button and banner
const editToggle = document.getElementById('editToggle');
const editBanner = document.querySelector('.edit-banner');
editToggle?.classList.remove('active', 'show');
editBanner?.classList.remove('active', 'show');
const html = '\n' + document.documentElement.outerHTML;
// Restore edit state so the user can keep editing
document.body.classList.add('edit-active');
editableEls.forEach(el => el.setAttribute('contenteditable', 'true'));
editToggle?.classList.add('active');
editBanner?.classList.add('active');
const blob = new Blob([html], { type: 'text/html' });
const a = document.createElement('a');
a.href = URL.createObjectURL(blob);
a.download = 'presentation.html';
a.click();
URL.revokeObjectURL(a.href);
}
```
## Image Pipeline (Skip If No Images)
If user chose "No images" in Phase 1, skip this entirely. If images were provided, process them before generating HTML.
**Dependency:** `pip install Pillow`
### Image Processing
```python
from PIL import Image, ImageDraw
# Circular crop (for logos on modern/clean styles)
def crop_circle(input_path, output_path):
img = Image.open(input_path).convert('RGBA')
w, h = img.size
size = min(w, h)
left, top = (w - size) // 2, (h - size) // 2
img = img.crop((left, top, left + size, top + size))
mask = Image.new('L', (size, size), 0)
ImageDraw.Draw(mask).ellipse([0, 0, size, size], fill=255)
img.putalpha(mask)
img.save(output_path, 'PNG')
# Resize (for oversized images that inflate HTML)
def resize_max(input_path, output_path, max_dim=1200):
img = Image.open(input_path)
img.thumbnail((max_dim, max_dim), Image.LANCZOS)
img.save(output_path, quality=85)
```
| Situation | Operation |
| -------------------------------- | ----------------------------- |
| Square logo on rounded aesthetic | `crop_circle()` |
| Image > 1MB | `resize_max(max_dim=1200)` |
| Wrong aspect ratio | Manual crop with `img.crop()` |
Save processed images with `_processed` suffix. Never overwrite originals.
### Image Placement
**Use direct file paths** (not base64) — presentations are viewed locally:
```html
<img src="assets/logo_round.png" alt="Logo" class="slide-image logo" />
<img
src="assets/screenshot.png"
alt="Screenshot"
class="slide-image screenshot"
/>
```
```css
.slide-image {
max-width: 100%;
max-height: min(50vh, 400px);
object-fit: contain;
border-radius: 8px;
}
.slide-image.screenshot {
border: 1px solid rgba(255, 255, 255, 0.1);
border-radius: 12px;
box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}
.slide-image.logo {
max-height: min(30vh, 200px);
}
```
**Adapt border/shadow colors to match the chosen style's accent.** Never repeat the same image on multiple slides (except logos on title + closing).
**Placement patterns:** Logo centered on title slide. Screenshots in two-column layouts with text. Full-bleed images as slide backgrounds with text overlay (use sparingly).
---
## Code Quality
**Comments:** Every section needs clear comments explaining what it does and how to modify it.
**Accessibility:**
- Semantic HTML (`<section>`, `<nav>`, `<main>`)
- Keyboard navigation works fully
- ARIA labels where needed
- `prefers-reduced-motion` support (included in viewport-base.css)
## File Structure
Single presentations:
```
presentation.html # Self-contained, all CSS/JS inline
assets/ # Images only, if any
```
Multiple presentations in one project:
```
[name].html
[name]-assets/
```