Notification Stack

Install

That writes one file: compositions/components/notification-stack.html.

Paste it into your composition

Open compositions/components/notification-stack.html and copy what is inside into your own composition. A component has no size or duration of its own. It takes both from the composition you paste it into.

Variables

Every one of these has a default, so the piece works untouched. Set the ones you want to change on the element:

Variable	Default	Accepts	What it does
`titles`	`Build queued,Checks passed,Deploy live`	string	Comma-separated card titles (1 to 5 cards).
`bodies`	`Pipeline started for main,All 42 checks green,Now serving version 2.4`	string	Comma-separated body lines matched to titles by index. Blank entries hide that body line.
`expand`	`-1`	-1 to 4, step 1	Index of the focus card in the titles list. -1 focuses the newest card (top of the stack).
`cues`	“	string	Comma-separated per-card arrival times in seconds. Blank entries use the default rhythm.
`accent`	`green`	`green`, `blue`, `violet`	Accent token family used by the icon dots.
`exit`	`none`	`none`, `fade`, `up`	How the stack leaves the frame. Default none: the hold ends the film.

Set them with data-variable-values on the element that mounts it. These are the defaults, so this behaves exactly like the preview above until you change one:

<div
  data-composition-id="notification-stack"
  data-composition-src="compositions/components/notification-stack.html"
  data-variable-values='{"titles":"Build queued,Checks passed,Deploy live","bodies":"Pipeline started for main,All 42 checks green,Now serving version 2.4","expand":-1,"cues":"","accent":"green","exit":"none"}'
></div>

Source

notification-stack.html

<!doctype html>
<!--
  notification-stack: HyperFrames video primitive (product demo)

  1 to 5 token notification cards (accent icon dot, title, one body line)
  slide-settle into a vertical stack on cues, newest on top: each new card
  drops into the top slot while the cards already present shift down one
  slot. After the last card lands, one card (the expand index) grows
  slightly and brightens to resolve as the focus while the rest dim by
  stack position (deeper cards dim more). Then the frame holds STILL.

  Variables (declared in data-composition-variables below):
    - titles (string, default "Build queued,Checks passed,Deploy live"):
      comma list of card titles, 1 to 5 cards; extras past 5 are dropped.
    - bodies (string): comma list of body lines matched to titles by index.
      A missing or blank entry hides that card's body line.
    - expand (number, default -1): index into the titles list of the focus
      card. -1 (or any out-of-range value) means the newest card, which
      sits on top of the stack.
    - cues (string, default ""): comma-separated per-card arrival times in
      seconds relative to mount start. Blank or invalid entries fall back
      to that card's default rhythm slot (~0.55s gap). Values are kept
      non-decreasing and clamped so every card lands before the resolve.
    - accent (green | blue | violet, default green): icon dot family.
      green -> --brand, blue -> --accent, violet -> --accent-2.
    - exit ("none" | "fade" | "up", default "none"): frame roots own
      transitions; the default hold-ends-the-film.

  Envelope, fixed IN with elastic HOLD (never gsap.timeScale()):
    IN    = arrivals on cues, then the focus resolve (~0.5s)
    HOLD  = still, elastic: everything after the resolve until OUT (or D)
    OUT   = 0 when exit is "none"; else 0.45s fade / fade-up of the stage.
    Arrival starts clamp together when D is too short for the rhythm.

  Seek safety: every property change is a fromTo with explicit endpoints
  at absolute times, and consecutive tweens on the same property never
  overlap (each event's duration is capped at the gap to the next event).

  Mount contract: elastic root, no data-width/data-height, styled via
  #root only, container-type: size, one paused timeline registered under
  the literal "notification-stack" key. Deterministic: no CSS transitions,
  no Date.now, no randomness.
-->
<html
  lang="en"
  data-composition-id="notification-stack"
  data-composition-duration="4"
  data-composition-variables='[
    { "id": "titles", "type": "string", "role": "content", "label": "Titles", "description": "Comma-separated card titles (1 to 5 cards).", "default": "Build queued,Checks passed,Deploy live" },
    { "id": "bodies", "type": "string", "role": "content", "label": "Bodies", "description": "Comma-separated body lines matched to titles by index. Blank entries hide that body line.", "default": "Pipeline started for main,All 42 checks green,Now serving version 2.4" },
    { "id": "expand", "type": "number", "role": "content", "label": "Expand", "description": "Index of the focus card in the titles list. -1 focuses the newest card (top of the stack).", "default": -1, "min": -1, "max": 4, "step": 1 },
    { "id": "cues", "type": "string", "role": "timing", "label": "Cues", "description": "Comma-separated per-card arrival times in seconds. Blank entries use the default rhythm.", "default": "" },
    { "id": "accent", "type": "enum", "role": "style", "label": "Accent", "description": "Accent token family used by the icon dots.", "default": "green", "options": [{ "value": "green", "label": "Green" }, { "value": "blue", "label": "Blue" }, { "value": "violet", "label": "Violet" }] },
    { "id": "exit", "type": "enum", "role": "timing", "label": "Exit", "description": "How the stack leaves the frame. Default none: the hold ends the film.", "default": "none", "options": [{ "value": "none", "label": "None" }, { "value": "fade", "label": "Fade" }, { "value": "up", "label": "Up" }] }
  ]'
>
  <head>
    <meta charset="UTF-8" />
    <title>Notification Stack</title>
  </head>
  <body>
    <template>
      <div id="root" data-composition-id="notification-stack" data-duration="4" data-fps="30">
        <style>
          *,
          *::before,
          *::after {
            box-sizing: border-box;
          }

          #root {
            position: absolute;
            inset: 0;
            overflow: hidden;
            container-type: size;
            isolation: isolate;
            background: var(--bg, transparent);
            color: var(--fg, #f8fafc);
            font-family: var(--font-body, system-ui, -apple-system, "Segoe UI", sans-serif);
            pointer-events: none;
          }

          .ns-clip {
            position: absolute;
            inset: 0;
            display: grid;
            place-items: center;
            overflow: hidden;
          }

          .ns-stage {
            position: relative;
            width: min(54cqw, 110cqh);
            will-change: transform, opacity;
          }

          .ns-card {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: var(--ns-card-h, 14cqh);
            display: flex;
            align-items: center;
            gap: var(--space-2, 2.2cqmin);
            padding: 0 var(--space-2, 2.2cqmin);
            overflow: hidden;
            border: 0.16cqmin solid var(--border, #334155);
            border-radius: var(--radius, 1.8cqmin);
            background: var(--surface, #131a24);
            box-shadow: 0 1cqmin 3cqmin color-mix(in srgb, var(--bg, #05070a) 45%, transparent);
            will-change: transform, opacity, filter;
          }

          .ns-dot {
            flex: 0 0 auto;
            width: min(1.7cqmin, calc(var(--ns-card-h, 14cqh) * 0.14));
            aspect-ratio: 1;
            border-radius: 50%;
            background: var(--ns-accent, var(--brand, #71f5a7));
          }

          .ns-text {
            display: flex;
            flex-direction: column;
            gap: min(0.7cqmin, calc(var(--ns-card-h, 14cqh) * 0.06));
            min-width: 0;
          }

          .ns-title {
            overflow: hidden;
            color: var(--fg, #f8fafc);
            font-size: min(3.2cqmin, calc(var(--ns-card-h, 14cqh) * 0.24));
            font-weight: 600;
            line-height: 1.2;
            letter-spacing: 0.01em;
            white-space: nowrap;
            text-overflow: ellipsis;
          }

          .ns-body {
            overflow: hidden;
            color: var(--muted, #94a3b8);
            font-size: min(2.5cqmin, calc(var(--ns-card-h, 14cqh) * 0.19));
            font-weight: 400;
            line-height: 1.25;
            white-space: nowrap;
            text-overflow: ellipsis;
          }
        </style>

        <div
          id="notification-stack-clip"
          class="ns-clip clip"
          data-start="0"
          data-duration="4"
          data-track-index="0"
        >
          <div class="ns-stage" role="list"></div>
        </div>

        <script src="https://cdn.jsdelivr.net/npm/gsap@3.14.2/dist/gsap.min.js"></script>
        <script>
          (function () {
            "use strict";

            // Literal id, never read off the DOM: the flattening step strips
            // data-composition-id from the mounted root (see toggle-flip).
            var compositionId = "notification-stack";
            var root = document.getElementById("root");
            var stage = root.querySelector(".ns-stage");
            var vars =
              window.__hyperframes && window.__hyperframes.getVariables
                ? window.__hyperframes.getVariables()
                : {};

            function toList(value, fallback) {
              var raw = value == null || String(value).trim() === "" ? fallback : String(value);
              return raw.split(",").map(function (token) {
                return token.trim();
              });
            }

            var titles = toList(vars.titles, "Build queued,Checks passed,Deploy live")
              .filter(function (token) {
                return token !== "";
              })
              .slice(0, 5);
            if (titles.length === 0) titles = ["Build queued", "Checks passed", "Deploy live"];
            var bodies = toList(
              vars.bodies,
              "Pipeline started for main,All 42 checks green,Now serving version 2.4",
            );
            var count = titles.length;

            var exit = vars.exit === "fade" || vars.exit === "up" ? vars.exit : "none";

            // Each enum choice routes to a DIFFERENT contract token so the
            // variable stays meaningful under a theme.
            var accentColors = {
              green: "var(--brand, #71f5a7)",
              blue: "var(--accent, #61a8ff)",
              violet: "var(--accent-2, #c5a3ff)",
            };
            var accent = Object.prototype.hasOwnProperty.call(accentColors, vars.accent)
              ? vars.accent
              : "green";
            root.style.setProperty("--ns-accent", accentColors[accent]);

            // Focus card: index into the titles list; -1 / out of range means
            // the newest card, which finishes on top of the stack.
            var expandRaw = Math.round(Number(vars.expand));
            var expand =
              Number.isFinite(expandRaw) && expandRaw >= 0 && expandRaw < count
                ? expandRaw
                : count - 1;

            // Geometry: cards fill up to ~74cqh of the stack region; the
            // stage box is the FINAL stack size so the clip centers it once.
            var GAP_CQH = 2;
            var cardH = Math.min(15, (74 - (count - 1) * GAP_CQH) / count);
            var slotH = cardH + GAP_CQH;
            root.style.setProperty("--ns-card-h", cardH.toFixed(3) + "cqh");
            stage.style.height = (count * cardH + (count - 1) * GAP_CQH).toFixed(3) + "cqh";
            stage.setAttribute("aria-label", titles.join(", "));

            var cards = titles.map(function (title, index) {
              var card = document.createElement("div");
              card.className = "ns-card";
              card.setAttribute("role", "listitem");
              // Static stacking: the focus card sits above its dimmed
              // neighbors so its slight grow overlaps them cleanly.
              card.style.zIndex = index === expand ? "2" : "1";
              var dot = document.createElement("span");
              dot.className = "ns-dot";
              dot.setAttribute("aria-hidden", "true");
              card.appendChild(dot);
              var text = document.createElement("span");
              text.className = "ns-text";
              var titleEl = document.createElement("span");
              titleEl.className = "ns-title";
              titleEl.textContent = title;
              text.appendChild(titleEl);
              var body = (bodies[index] || "").trim();
              if (body !== "") {
                var bodyEl = document.createElement("span");
                bodyEl.className = "ns-body";
                bodyEl.textContent = body;
                text.appendChild(bodyEl);
              }
              card.appendChild(text);
              stage.appendChild(card);
              return card;
            });

            // RETIME RANGE: arrivals on cues, fixed resolve, elastic still
            // HOLD, optional OUT.
            var BASE = 0.2;
            var GAP = 0.55;
            var ENTER = 0.55;
            var SHIFT = 0.45;
            var RESOLVE_DUR = 0.5;
            var OUT_BASE = 0.45;
            var duration = Math.max(0.001, parseFloat(root.dataset.duration || "4"));
            var OUT = exit === "none" ? 0 : Math.min(OUT_BASE, duration * 0.25);
            var avail = duration - OUT;
            var latestStart = Math.max(0, avail - 1.05);

            var cueList = String(vars.cues == null ? "" : vars.cues).split(",");
            var starts = [];
            for (var i = 0; i < count; i++) {
              var cue = Number((cueList[i] || "").trim());
              var hasCue = (cueList[i] || "").trim() !== "" && Number.isFinite(cue);
              var start = hasCue ? cue : BASE + GAP * i;
              if (i > 0) start = Math.max(start, starts[i - 1] + 0.05);
              starts.push(Math.max(0, Math.min(start, latestStart)));
            }
            for (i = 1; i < count; i++) starts[i] = Math.max(starts[i], starts[i - 1]);

            var last = starts[count - 1];
            var resolve = Math.max(last + 0.1, Math.min(last + 0.65, avail - RESOLVE_DUR));
            var resolveDur = Math.min(RESOLVE_DUR, Math.max(0.001, avail - resolve));

            // Tween distances in px, derived once from the measured mount
            // height (what 1cqh resolves to). GSAP interpolates chained
            // cqh-unit transform tweens incorrectly mid-tween, so transforms
            // ride px while all layout stays in container units.
            var rootH = root.offsetHeight || window.innerHeight || 1080;
            var cqhPx = rootH / 100;
            var yFor = function (slot) {
              return slot * slotH * cqhPx;
            };
            var enterY = -(cardH * 0.6 * cqhPx);

            var tl = gsap.timeline({ paused: true });

            // IN: each card drops into the TOP slot with a fade and a smooth
            // long-tail settle while every earlier card shifts down one slot.
            // Event durations are capped at the gap to the next event so no
            // two tweens on the same property ever overlap.
            cards.forEach(function (card, index) {
              var eventStart = starts[index];
              var nextEvent = index + 1 < count ? starts[index + 1] : resolve;
              var eventCap = Math.max(0.001, nextEvent - eventStart);
              gsap.set(card, { opacity: 0, y: enterY });
              tl.fromTo(
                card,
                { opacity: 0, y: enterY },
                {
                  opacity: 1,
                  y: yFor(0),
                  duration: Math.min(ENTER, eventCap),
                  ease: "power3.out",
                },
                eventStart,
              );
              for (var j = 0; j < index; j++) {
                // immediateRender false: a build-time render of this from
                // state would park the card at a mid-stack slot before its
                // own entrance has run.
                tl.fromTo(
                  cards[j],
                  { y: yFor(index - 1 - j) },
                  {
                    y: yFor(index - j),
                    duration: Math.min(SHIFT, eventCap),
                    ease: "power3.out",
                    immediateRender: false,
                  },
                  eventStart,
                );
              }
            });

            // RESOLVE: the focus card grows slightly and brightens; the rest
            // dim by stack position (deeper cards dim more). Filter tweens
            // stay numeric; no var() color string is ever tweened.
            cards.forEach(function (card, index) {
              var stackPos = count - 1 - index;
              if (index === expand) {
                tl.fromTo(
                  card,
                  { scale: 1, filter: "brightness(1)" },
                  {
                    scale: 1.045,
                    filter: "brightness(1.1)",
                    duration: resolveDur,
                    ease: "power2.out",
                    immediateRender: false,
                  },
                  resolve,
                );
              } else {
                tl.fromTo(
                  card,
                  { opacity: 1 },
                  {
                    opacity: Math.max(0.42, 0.72 - 0.07 * stackPos),
                    duration: resolveDur,
                    ease: "power2.out",
                    immediateRender: false,
                  },
                  resolve,
                );
              }
            });

            // HOLD: intentionally still. Nothing floats, nothing pushes in.

            // OUT: the whole resolved stack leaves together.
            if (exit !== "none") {
              var OUT_START = duration - OUT;
              tl.to(stage, { opacity: 0, duration: OUT, ease: "power2.in" }, OUT_START);
              if (exit === "up") {
                tl.to(stage, { y: -3 * cqhPx, duration: OUT, ease: "power2.in" }, OUT_START);
              }
            }

            tl.seek(0);
            window.__timelines = window.__timelines || {};
            window.__timelines[compositionId] = tl;
          })();
        </script>
      </div>
    </template>
  </body>
</html>

Tagged motion-primitive product-demo notification stack stagger.

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