Design System for Installless Demos: 8 Reusable UI Patterns That Cut Demo Development Time

Installless demos (playables) are different from full apps: they must load fast, be navigable with minimal friction, present a concise conversion funnel, and remain discoverable by search. The design system’s job is to constrain choices so developers and contractors implement consistent microflows and predictable accessibility behavior across demos.

Practical constraints that change component design: demos should be keyboard-first (for speed and accessibility), have progressive reveal to keep initial payload minimal, show skeleton states instead of spinners for immediate perceived performance, and include lightweight telemetry hooks so you can measure funnel steps without shipping full analytics stacks.

1) Onboarding microflow shell — a compact, single-responsibility layout that manages step state, focus, and minimal breadcrumb. Keep the shell HTML semantic, expose step ARIA attributes, and limit each step to one primary action so telemetry maps cleanly to conversion events.

2) Progressive reveal container — render a minimal initial DOM and progressively hydrate interactive parts. Use placeholders and inline SVGs for icons to avoid extra network requests; swap in interactive components when the user engages (keyboard focus, click, or intersection).

Make keyboard navigation the default interaction model for microflows. Users should be able to complete the demo entirely with the keyboard: tab to interactive regions, arrow keys to move within grouped controls, and Enter/Space to activate. Use native HTML controls when possible and supplement with ARIA only where semantics are missing.

Constrain focus behavior: when a step appears, move focus to the first actionable element; if a modal opens, trap focus and restore it on close. Ensure every focusable element has visible focus styles and test the flow with keyboard-only and screen-reader tools before shipping.

Author semantic tokens in Figma (colors, spacing, type, elevation) and group them into a small, demo-focused token set. Give each token a descriptive name (e.g., demo.primary.bg, demo.surface.card). Use Figma Variables or Token Studio so they can be exported programmatically.

Export recipe: keep a single 'Demo Tokens' Figma file, publish variables, then export via Figma REST API, Token Studio, or a trusted plugin into W3C/DTCG-compatible JSON. Wire a GitHub Action (or provide the JSON) so contractors receive a token bundle they can import into Style Dictionary or the demo repo directly.

Instrumentation should be deterministic and tiny. Expose three mandatory telemetry events for every demo: step_view (when a step becomes visible and focused), step_complete (when user performs the primary action on the step), and demo_exit (when the user leaves or completes the demo). Implement a small client that queues events and flushes on visibilitychange or when the queue reaches N events to avoid network overhead.

Acceptance tests: provide contractors with a compact matrix (manual + automated checks) to validate the demo before release. The matrix should verify keyboard navigation, skeleton states at first paint, Figma token parity (colors/spacings), and telemetry event emission for primary funnel steps.