Focus Swap

Install

That writes one file: compositions/components/focus-swap.html.

Paste it into your composition

Open compositions/components/focus-swap.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
`focus`	`b`	`a`, `b`	Card that ends sharp, full-size, and fully opaque.
`blurPx`	`6`	0px to 20px, step 1px	Blur applied to the card outside the viewer focus.
`dim`	`0.5`	0 to 1, step 0.05	Opacity of the card outside the viewer focus.

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="focus-swap"
  data-composition-src="compositions/components/focus-swap.html"
  data-variable-values='{"focus":"b","blurPx":6,"dim":0.5}'
></div>

Source

focus-swap.html

<!doctype html>
<!--
  focus-swap: HyperFrames video primitive (ui-props / holdable / demonstrate)

  Concept: attention moves between two side-by-side cards. The card losing
  focus recedes to 0.92 scale, softens, and dims while the other card advances
  to full scale, sharpness, and opacity. Both sides move together as one clean
  swap.

  Compiled-from evidence: launches-motion-vocabulary.md section 3.6 identifies
  blur-focus / defocus in 14 of 18 production launches and names focus-swap as
  a high-frequency missing primitive for blur + opacity + optional scale.

  Use when: directing the viewer from one product state, option, or result to
  another without moving either element out of its established layout.

  Variables:
    - focus ("a" | "b", default "b"): the card that ends focused.
    - blurPx (number, default 6): blur applied to the unfocused card.
    - dim (number from 0 to 1, default 0.5): unfocused card opacity.

  Envelope (holdable):
    IN = 0.90s at the standard duration, including a 0.20s readable lead.
    HOLD = elastic and deliberately still after focus lands.
    OUT = none; the host composition owns the cut or exit.
    For durations under 0.90s, the lead and swap compress to finish by D.

  Sync point: focus-landed at 0.90s into IN at the standard duration. It
  compresses with IN only when D is shorter than 0.90s and never enters HOLD.

  Sound: none. This continuous attention shift has no discrete impact cue.

  Mount contract: this is a template-wrapped sub-composition. The runtime
  clones only template contents. #root has no data-width or data-height and
  fills the host-owned box with position:absolute, inset:0, and
  container-type:size. The paused GSAP timeline is registered under the
  hardcoded composition id "focus-swap".
-->
<html
  lang="en"
  data-composition-variables='[
    { "id": "focus", "type": "enum", "role": "motion", "label": "Final focus", "description": "Card that ends sharp, full-size, and fully opaque.", "default": "b", "options": [{ "value": "a", "label": "Card A" }, { "value": "b", "label": "Card B" }] },
    { "id": "blurPx", "type": "number", "role": "style", "label": "Unfocused blur", "description": "Blur applied to the card outside the viewer focus.", "default": 6, "min": 0, "max": 20, "step": 1, "unit": "px" },
    { "id": "dim", "type": "number", "role": "style", "label": "Unfocused opacity", "description": "Opacity of the card outside the viewer focus.", "default": 0.5, "min": 0, "max": 1, "step": 0.05 }
  ]'
>
  <head>
    <meta charset="UTF-8" />
    <title>Focus Swap</title>
  </head>
  <body>
    <template>
      <div id="root" data-composition-id="focus-swap" data-duration="1.5" data-fps="30">
        <style>
          *,
          *::before,
          *::after {
            box-sizing: border-box;
          }

          #root {
            position: absolute;
            inset: 0;
            container-type: size;
            isolation: isolate;
            overflow: hidden;
            background: var(--bg);
            color: var(--fg);
            font-family: var(--font-body);
          }

          .fs-clip {
            width: 100%;
            height: 100%;
            display: grid;
            place-items: center;
            padding: 7cqh 6cqw;
          }

          .fs-pair {
            width: 100%;
            height: min(72cqh, 52cqw);
            display: grid;
            grid-template-columns: repeat(2, minmax(0, 1fr));
            gap: 4cqw;
            align-items: stretch;
          }

          /* EDIT ZONE: visual payload only. Keep the card frames and their
             initial states transform-free because GSAP owns scale and blur. */
          .fs-card {
            min-width: 0;
            position: relative;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            padding: 5cqh 3.2cqw;
            overflow: hidden;
            border: 0.16cqw solid var(--border);
            border-radius: var(--radius);
            background: var(--surface);
            box-shadow: 0 2.2cqh 5cqh color-mix(in srgb, var(--bg) 72%, transparent);
            transform-origin: center;
            will-change: transform, filter, opacity;
            /* Both cards are the same placeholder material. Which one holds
               attention is said by blur, scale, and opacity, never by hue. */
            --fs-card-accent: color-mix(in srgb, var(--fg) 72%, var(--surface));
          }

          .fs-card::before {
            content: "";
            position: absolute;
            inset: 0 0 auto;
            height: 0.75cqh;
            background: var(--fs-card-accent);
          }

          .fs-card-head {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--space-2);
          }

          .fs-card-letter {
            display: grid;
            place-items: center;
            width: 5cqw;
            aspect-ratio: 1;
            border-radius: 50%;
            background: color-mix(in srgb, var(--fg) 13%, var(--surface));
            color: var(--fg);
            font-family: var(--font-mono);
            font-size: 2.3cqw;
            font-weight: 700;
          }

          .fs-status {
            color: var(--muted);
            font-family: var(--font-mono);
            font-size: 1.25cqw;
            letter-spacing: 0.12em;
            text-transform: uppercase;
          }

          .fs-copy {
            display: grid;
            gap: var(--space-1);
          }

          .fs-title {
            color: var(--fg);
            font-family: var(--font-display);
            font-size: 3.4cqw;
            font-weight: 680;
            line-height: 1;
            letter-spacing: -0.025em;
          }

          .fs-detail {
            color: var(--muted);
            font-size: 1.45cqw;
            line-height: 1.35;
          }

          .fs-meter {
            height: 1.1cqh;
            overflow: hidden;
            border-radius: var(--radius);
            background: color-mix(in srgb, var(--border) 60%, transparent);
          }

          .fs-meter-fill {
            width: var(--fs-meter-width);
            height: 100%;
            border-radius: inherit;
            background: var(--fs-card-accent);
          }
        </style>

        <div class="fs-clip clip" data-start="0" data-duration="1.5" data-track-index="0">
          <div class="fs-pair">
            <article class="fs-card" data-focus-card="a" aria-label="Card A, plan">
              <div class="fs-card-head">
                <span class="fs-card-letter">A</span>
                <span class="fs-status">Plan</span>
              </div>
              <div class="fs-copy">
                <h2 class="fs-title">Shape the idea</h2>
                <p class="fs-detail">Define the brief and align the team.</p>
              </div>
              <div class="fs-meter" aria-hidden="true">
                <div class="fs-meter-fill" style="--fs-meter-width: 58%"></div>
              </div>
            </article>

            <article class="fs-card" data-focus-card="b" aria-label="Card B, launch">
              <div class="fs-card-head">
                <span class="fs-card-letter">B</span>
                <span class="fs-status">Launch</span>
              </div>
              <div class="fs-copy">
                <h2 class="fs-title">Ship the result</h2>
                <p class="fs-detail">Move from approved work to live impact.</p>
              </div>
              <div class="fs-meter" aria-hidden="true">
                <div class="fs-meter-fill" style="--fs-meter-width: 86%"></div>
              </div>
            </article>
          </div>
        </div>

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

            var root = document.getElementById("root");
            var cardA = root.querySelector('[data-focus-card="a"]');
            var cardB = root.querySelector('[data-focus-card="b"]');
            var vars =
              window.__hyperframes && window.__hyperframes.getVariables
                ? window.__hyperframes.getVariables()
                : {};

            // INVARIANT: focus is the only owner of which card advances and
            // which recedes. Invalid input resolves to the declared default.
            var targetIsB = vars.focus !== "a";
            var initialFocused = targetIsB ? cardA : cardB;
            var targetFocused = targetIsB ? cardB : cardA;

            var rawBlur = Number(vars.blurPx);
            var blurPx = Number.isFinite(rawBlur) ? Math.max(0, Math.min(20, rawBlur)) : 6;
            var rawDim = Number(vars.dim);
            var dim = Number.isFinite(rawDim) ? Math.max(0, Math.min(1, rawDim)) : 0.5;
            var blurred = "blur(" + blurPx + "px)";
            var sharp = "blur(0px)";

            // RETIME RANGE: keep the standard 0.20s lead and 0.70s swap. Only
            // short host durations compress them so focus always lands by D.
            var duration = Math.max(0.001, parseFloat(root.dataset.duration || "1.5"));
            var SWAP_START = Math.min(0.2, duration * 0.2);
            var SWAP_DURATION = Math.min(0.7, Math.max(0.001, duration - SWAP_START));

            gsap.set(initialFocused, { opacity: 1, scale: 1, filter: sharp });
            gsap.set(targetFocused, { opacity: dim, scale: 0.92, filter: blurred });

            var tl = gsap.timeline({ paused: true });
            tl.to(
              initialFocused,
              {
                opacity: dim,
                scale: 0.92,
                filter: blurred,
                duration: SWAP_DURATION,
                ease: "power2.out",
              },
              SWAP_START,
            );
            tl.to(
              targetFocused,
              {
                opacity: 1,
                scale: 1,
                filter: sharp,
                duration: SWAP_DURATION,
                ease: "power2.out",
              },
              SWAP_START,
            );

            tl.seek(0);

            window.__timelines = window.__timelines || {};
            window.__timelines["focus-swap"] = tl;
          })();
        </script>
      </div>
    </template>
  </body>
</html>

Tagged effect ui-props focus blur attention demonstrate.

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