Reveal On Scroll

Live preview

Content block that starts invisible and fades + slides into view when scrolled into the viewport, using an IntersectionObserver with a CSS class toggle. Requires a small inline script — degrades gracefully to visible static content where JS is unavailable.

Surfaces

webgoogle-apps-script-webmcp-appsandroid

Degraded on

Surface	Note
google-meet-stage	Content renders visible immediately (no scroll context)
pdf	Renders as fully visible static block
google-chat	Renders as plain text block

Fields

Field	Type	Required
title	string. Bold heading inside the block.	optional
body	string. Body text inside the block.	optional
direction	"up" \| "down" \| "left" \| "right" (optional, default "up"). Drift direction before reveal.	optional
duration	number. Transition duration in seconds. Default 0.7.	optional
accent	string. Left border accent colour. Default "#4f46e5".	optional
background	string. Block background. Default "#f8fafc".	optional

Example payload

{
  "type": "reveal_on_scroll"
}

ARD catalog entry

{
  "identifier": "urn:air:a2uicatalog.ai:atom:reveal_on_scroll",
  "displayName": "Reveal On Scroll",
  "type": "application/vnd.a2ui.atom+json",
  "url": "https://a2uicatalog.ai/atoms/reveal_on_scroll/",
  "capabilities": [
    "web",
    "google-apps-script-web",
    "mcp-apps",
    "android"
  ],
  "description": "Content block that starts invisible and fades + slides into view when scrolled into the viewport, using an IntersectionObserver with a CSS class toggle. Requires a small inline script \u2014 degrades gracefully to visible static content where JS is unavailable.",
  "representativeQueries": [
    "show a IntersectionObserver scroll-triggered fade+slide reveal",
    "content block that starts invisible and fades + slides into view when scrolled into the viewport, us",
    "render a reveal on scroll"
  ]
}

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Deploy your own Google Apps Script renderer

The renderer is an open-source Google Apps Script web app. Deploy your own instance in 4 commands — you own the URL, no dependency on the demo endpoint.

git clone https://github.com/a2uicatalog/a2ui
cd a2ui/apps-script-surface/gas-wired-renderer
clasp push && clasp deploy

Full deploy guide →