Crafting Presentations

Multi-slide HTML decks with deck-stage navigation, slide-type composition, and a two-window presenter mode. Bundles a complete example deck (Deloitte x Databricks Alliance) under references/.

When to use this skill

Reach for crafting-presentations when the deck is more than two or three slides, when speaker notes will be presented live, or when the user wants a presenter-view sidecar window during a Teams, Zoom, or Meet share. For a quick one-off single-file slide deck without presenter mode, use workbench:crafting-html and its references/09-slide-deck.html template. For theming a deck to a brand, layer workbench:crafting-design-systems on top of this skill.

If you have not yet designed the deck's content (audience analysis, message structure, slide-by-slide storyboard, speaker notes), invoke writing:presentations first. It produces a deck.md you can pass to this skill as the source brief, then crafting-presentations handles the HTML rendering.

The stage

Every slide is a <section> inside a <deck-stage> custom element. The authored canvas is 1920 x 1080 (16:9). deck-stage.js fits the canvas to the viewport via CSS transform scaling, so the deck looks the same in a 4K display and in a Zoom share. Slides are addressed by index (1-based on the URL hash, e.g. #3) and by data-screen-label for the agenda strip.

Layout grammar:

• Outer padding 80 to 120 pixels. The empty space is part of the brand.
• 12-column grid with 32-pixel gutters as a soft guide.
• One idea per slide. If you need three, make three slides.
• Footer band on every non-title slide, with a brand wordmark left and slide number right.

Slide-type catalog

Composing the deck

Use references/deloitte-databricks-alliance/slides/index.html as the canonical starting point. It composes all ten slide types in one HTML file with <deck-stage> wrapping them. Adapt the content to the user's topic; do not move slides between the <deck-stage> and the page body, the deck-stage element drives scaling and navigation.

Speaker notes

Speaker notes live in a JSON island inside the deck HTML:

<script type="application/json" id="speaker-notes">
{
  "1": "Open with the value prop. Twenty seconds.",
  "2": "Set up the section: what we are about to cover."
}
</script>

Keys match the 1-based slide index. presenter.js reads this block and sends it to the presenter window over the sync channel. A slide without a notes entry shows "No notes for this slide" in presenter view. The displayed notes render a small markdown subset (headings, bold, italics, inline code, bullet and numbered lists).

Notes are editable live from the presenter window: E (or the Edit button) turns the notes panel into a raw-markdown textarea for the current slide. Edits autosave to localStorage per deck, survive reloads of either window, and the "Save to deck" button writes the updated JSON island back into the deck HTML file via the File System Access API (Chromium only; the picker prompts once per session, validates the chosen file contains <deck-stage>, and warns when the filename does not match the deck).

Presenter mode

Open the deck in Edge, Chrome, or Arc. Keys (from the deck window):

• P opens the presenter window. Allow the popup once.
• B blacks out the audience screen. Press again to resume.
• Arrow keys, Space, Home, End, click move both windows.

Keys (from the presenter window):

• B blacks out the audience screen.
• T resets the timer.
• E edits the current slide's notes; Esc finishes editing.
• . or K blacks out the presenter view itself.

While the presenter window is open, the deck window hides its thumbnail rail and nav overlay so the shared window shows clean slides; both return when the presenter closes.

Sync uses BroadcastChannel, no server required. It works across file:// pages in Chromium (they share one storage origin), which is the normal way these decks are presented. Preview iframes and presenting state are driven over postMessage because file:// documents are opaque origins to each other (contentDocument and window.opener.document are null); never reach into a frame's DOM from sibling deck windows.

Sharing in Teams, Zoom, or Meet: open the deck, press P, then pick Share to Window and select the deck window only. Never Share screen, or the presenter notes leak. The presenter window is invisible to the audience even though it is on the same machine.

Single-file vs multi-file output

Multi-file is the default. Keep the upstream layout: slides/index.html plus slides/slides.css plus slides/deck-stage.js plus slides/presenter.js plus slides/presenter.html plus assets/*.svg. This is the right shape for a deck that lives in a repo and benefits from editability.

Single-file is the right call when the deck must travel as one attachment (email, Teams DM, archive). Inline slides.css, deck-stage.js, presenter.js into the head of a single HTML file. Replace <img src="../assets/..."> with <svg> markup inline (the SVGs are small text). The presenter window needs the presenter.html sidecar next to the deck file, so a strictly single-file deck has no presenter mode; if presenter mode matters for a deck that travels, ship the pair (deck plus presenter.html). No HTTP server is needed either way: BroadcastChannel works across file:// pages in Chromium.

Applying a design system

Before emitting HTML, check for an active design system and inline its overrides into the deck's style:

1. Resolve the design-system name: per-prompt override (e.g., "render with the brand-2026 design system"), then .workbench/config.md ## Design system Name:, then no override.
2. Locate the directory: .workbench/design-systems/<name>/ (project scope), then ~/.claude/workbench/design-systems/<name>/ (user scope). If a name resolves but no directory is found at either scope, report the missing path to the user and emit with the bundled defaults; do not fabricate a substitute.
3. Inline colors.css (and typography.css if present) into the deck's <head> as a <style> block AFTER the bundled colors_and_type.css link or inline. This makes the design system's values win the cascade.
4. For any referenced component, paste components/<name>.html markup and scoped style into the deck slide where it belongs.
5. For any referenced image, base64-encode (base64 -w 0 <file>) and inline as data:image/<type>;base64,<payload>. SVG is text and can be inlined directly. Use relative paths only when the deck and the design system co-exist in the same git tree and the deck will not travel.

To create or edit a design system, see workbench:crafting-design-systems.

CSS variable surface

The bundled references/deloitte-databricks-alliance/colors_and_type.css and references/deloitte-databricks-alliance/slides/slides.css declare the :root variables the deck reads. The full inventory is documented in workbench:crafting-design-systems under its per-template variable inventory section. Override any subset via your design system's colors.css and typography.css.

Cross-references

• workbench:crafting-html is the catch-all for non-presentation HTML artifacts and ships a simpler single-file 09-slide-deck.html for quick one-off decks.
• workbench:exporting-decks-to-pptx converts a finished deck (single-file or multi-file) into a native, editable PowerPoint file.
• workbench:crafting-design-systems is the theming layer. It supplies the CSS variable overrides this skill consumes.
• workbench:writing-spec, workbench:writing-plans, workbench:brainstorming, workbench:systematic-debugging, and research:research are the other HTML producers in the wider plugin family, each with their own artifact shape.

Caveats

• The bundled deck loads Lucide icons from https://unpkg.com/lucide@latest. The deck breaks offline. If the deck must run offline, vendor Lucide into the slides directory and update the script reference.
• The bundled logos are stylized recreations of the Deloitte and Databricks wordmarks, not the official assets. Replace from the user's brand portal before any external-facing use. The bundled README.md documents this clearly.
• The bundled slides.css uses DM Sans via Google Fonts. Vendoring .woff2 or swapping for the user's licensed typeface is the right call for production decks.