Before After Wipe

Install

That writes one file: compositions/components/before-after-wipe.html.

Paste it into your composition

Open compositions/components/before-after-wipe.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
`label_a`	`Before`	string	Chip shown on the base before panel. Blank hides the chip.
`label_b`	`After`	string	Chip shown on the revealed after panel. Blank hides the chip.
`rest_split`	`50`	0% to 100%, step 1%	Divider resting position after the wipe lands.
`wipe_at`	`0.25`	0s to 8s, step 0.05s	Seconds after mount start when the wipe begins.
`accent`	`green`	`green`, `blue`, `violet`	Divider handle and after chip color.
`exit`	`none`	`none`, `fade`, `up`	Outgoing transition. None holds the final comparison frame.

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="before-after-wipe"
  data-composition-src="compositions/components/before-after-wipe.html"
  data-variable-values='{"label_a":"Before","label_b":"After","rest_split":50,"wipe_at":0.25,"accent":"green","exit":"none"}'
></div>

Source

before-after-wipe.html

<!doctype html>
<!--
  before-after-wipe: HyperFrames video primitive (ui-props / holdable / compare)

  Concept: two full-bleed CONTENT SLOTS share one frame. The before slot stays
  fully visible as the base layer while the after slot wipes over it from the
  left edge, and a persistent divider rests at rest_split percent. Callers fill
  the two named slot panels with their own content (screenshots, video, HTML);
  when a slot is left untouched, a tasteful token-styled default renders
  instead. One mechanic, one job: compare two visual states.

  Ports the divider-wipe mechanic from comparison-split, with real content
  slots instead of baked demo art (Wave J, U-B).

  Slots (see README.md for a worked example):
    - [data-slot="before"]: base layer content. Replace the children of this
      element in your installed copy. Default: a muted token wireframe.
    - [data-slot="after"]:  revealed layer content. Same mechanism. Default:
      a brand-tinted version of the wireframe.
    Direct img/video children of a slot are sized to cover the panel.

  Variables (declared in data-composition-variables below):
    - label_a (string, default "Before"): chip on the base panel. Empty hides it.
    - label_b (string, default "After"): chip on the revealed panel. Empty hides it.
    - rest_split (number, default 50, 0 to 100%): divider resting position.
    - wipe_at (number, seconds, default 0.25): when the wipe starts, relative
      to mount start. Clamped so the wipe always completes inside IN.
    - accent (green | blue | violet, default green): divider handle and after
      chip color. green maps to --brand, blue to --accent, violet to --accent-2.
    - exit (none | fade | up, default none): outgoing transition. none holds
      the final frame (frame roots own transitions; holds end films).

  The divider (and its knob) stays hidden until the wipe starts, then fades in
  as it departs the left edge: at split 0 the knob would straddle the frame
  edge half-clipped, which reads as a rendering bug rather than a resting
  state. One wipe pass, then the divider rests at rest_split for the whole
  hold.

  Envelope (fixed IN/OUT, elastic HOLD only, never gsap.timeScale()):
    IN       = wipe_at + 1.05s wipe travel (stage settles during the first 0.32s)
    HOLD     = elastic = max(0, D - (IN + OUT)); deliberately still so the
               comparison stays easy to inspect
    OUT      = 0.50s when exit is fade or up, 0 when exit is none
    If D < IN + OUT, IN and OUT scale down together so IN + OUT == D.

  Sync point: wipe-land at wipe_at + 1.05s inside IN (1.30s at defaults). It
  never moves into elastic HOLD.

  Sound cue: dispatches a bubbling `hf:sfx` CustomEvent with id
  "wipe-land-soft" at wipe-land. This primitive never plays audio.

  Mount contract: MOUNTABLE SUB-COMPOSITION. The runtime clones only
  <template> contents; #root fills the host box (inset:0, container-type:
  size), has no data-width/data-height, and registers one paused timeline
  under the literal "before-after-wipe" key (mount flattening strips
  data-composition-id from the live root). Variables come from
  window.__hyperframes.getVariables().
-->
<html
  lang="en"
  data-composition-id="before-after-wipe"
  data-composition-duration="4"
  data-composition-variables='[
    { "id": "label_a", "type": "string", "role": "content", "label": "Before label", "description": "Chip shown on the base before panel. Blank hides the chip.", "default": "Before" },
    { "id": "label_b", "type": "string", "role": "content", "label": "After label", "description": "Chip shown on the revealed after panel. Blank hides the chip.", "default": "After" },
    { "id": "rest_split", "type": "number", "role": "layout", "label": "Resting split", "description": "Divider resting position after the wipe lands.", "default": 50, "min": 0, "max": 100, "step": 1, "unit": "%" },
    { "id": "wipe_at", "type": "number", "role": "timing", "label": "Wipe start", "description": "Seconds after mount start when the wipe begins.", "default": 0.25, "min": 0, "max": 8, "step": 0.05, "unit": "s" },
    { "id": "accent", "type": "enum", "role": "style", "label": "Accent", "description": "Divider handle and after chip color.", "default": "green", "options": [{ "value": "green", "label": "Green" }, { "value": "blue", "label": "Blue" }, { "value": "violet", "label": "Violet" }] },
    { "id": "exit", "type": "enum", "role": "timing", "label": "Exit", "description": "Outgoing transition. None holds the final comparison frame.", "default": "none", "options": [{ "value": "none", "label": "None" }, { "value": "fade", "label": "Fade" }, { "value": "up", "label": "Up" }] }
  ]'
>
  <head>
    <meta charset="UTF-8" />
    <title>Before After Wipe</title>
  </head>
  <body>
    <template>
      <div id="root" data-composition-id="before-after-wipe" data-duration="4" data-fps="30">
        <style>
          *,
          *::before,
          *::after {
            box-sizing: border-box;
          }

          /* Root fills the host-owned box. Internal measurements use cqw/cqh
             and every painted color comes from a contract token. */
          #root {
            position: absolute;
            inset: 0;
            container-type: size;
            isolation: isolate;
            overflow: hidden;
            background: var(--bg, #07111f);
            color: var(--fg, #f8fafc);
            font-family: var(--font-body, Inter, system-ui, sans-serif);
          }

          .baw-clip,
          .baw-stage,
          .baw-panel,
          .baw-slot {
            position: absolute;
            inset: 0;
            width: 100%;
            height: 100%;
          }

          .baw-clip {
            overflow: hidden;
          }

          .baw-stage {
            --baw-split: 0;
            opacity: 0;
          }

          .baw-panel {
            overflow: hidden;
          }

          /* The after layer wipes over the base via one clip-path driven by
             --baw-split, the single owner of wipe progress. */
          .baw-after {
            z-index: 2;
            clip-path: inset(0 calc((100 - var(--baw-split)) * 1%) 0 0);
          }

          /* Caller-supplied media covers its panel edge to edge. */
          .baw-slot > img,
          .baw-slot > video {
            position: absolute;
            inset: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
          }

          /* Token-styled default slot content: a wireframe card that reads
             muted on the before layer and brand-tinted on the after layer.
             Callers replacing slot children never see any of this. */
          .baw-default {
            position: absolute;
            inset: 0;
            display: grid;
            place-items: center;
          }

          .baw-before .baw-default {
            background:
              linear-gradient(
                  color-mix(in srgb, var(--border, #334155) 34%, transparent) 0.12cqw,
                  transparent 0.12cqw
                )
                0 0 / 5cqw 5cqw,
              linear-gradient(
                  90deg,
                  color-mix(in srgb, var(--border, #334155) 34%, transparent) 0.12cqw,
                  transparent 0.12cqw
                )
                0 0 / 5cqw 5cqw,
              var(--surface, #172033);
          }

          .baw-after .baw-default {
            background: linear-gradient(
              135deg,
              color-mix(in srgb, var(--brand, #22c55e) 32%, var(--surface, #172033)) 0%,
              var(--surface, #172033) 58%,
              color-mix(in srgb, var(--baw-accent, #22c55e) 22%, var(--surface, #172033)) 100%
            );
          }

          .baw-card {
            width: 56cqw;
            height: 56cqh;
            padding: var(--space-3, 4cqh) var(--space-3, 4cqw);
            border: 0.16cqw solid var(--border, #334155);
            border-radius: var(--radius, 2.4cqmin);
            background: color-mix(in srgb, var(--surface, #172033) 88%, var(--bg, #07111f));
            box-shadow: 0 2cqh 5cqw color-mix(in srgb, var(--bg, #07111f) 45%, transparent);
          }

          .baw-after .baw-card {
            border-color: color-mix(
              in srgb,
              var(--baw-accent, #22c55e) 52%,
              var(--border, #334155)
            );
            background: color-mix(in srgb, var(--surface, #172033) 86%, var(--brand, #22c55e));
          }

          .baw-bar {
            width: 34%;
            height: 4.4cqh;
            margin-bottom: var(--space-3, 4cqh);
            border-radius: 1.2cqh;
            background: var(--muted, #94a3b8);
            opacity: 0.5;
          }

          .baw-after .baw-bar {
            background: var(--baw-accent, #22c55e);
            opacity: 0.92;
          }

          .baw-line {
            height: 2.4cqh;
            margin-bottom: var(--space-2, 2.6cqh);
            border-radius: 1.2cqh;
            background: var(--muted, #94a3b8);
            opacity: 0.4;
          }

          .baw-line:nth-of-type(2) {
            width: 92%;
          }

          .baw-line:nth-of-type(3) {
            width: 68%;
          }

          .baw-line:nth-of-type(4) {
            width: 44%;
          }

          .baw-after .baw-line {
            background: color-mix(in srgb, var(--brand, #22c55e) 70%, var(--fg, #f8fafc));
            opacity: 0.75;
          }

          /* Label chips live outside the slots so they always render above
             caller content. The after chip is clipped with its own panel, so
             it appears only once the wipe has passed it. */
          .baw-chip {
            position: absolute;
            z-index: 4;
            top: var(--space-3, 4cqh);
            padding: var(--space-1, 1.2cqh) var(--space-2, 2.2cqw);
            border: 0.14cqw solid var(--border, #334155);
            border-radius: 999cqw;
            background: color-mix(in srgb, var(--surface, #172033) 88%, var(--bg, #07111f));
            color: var(--muted, #94a3b8);
            font-family: var(--font-display, Inter, system-ui, sans-serif);
            font-size: min(3cqw, 4.2cqh);
            font-weight: 600;
            letter-spacing: 0.08em;
            line-height: 1;
            text-transform: uppercase;
            white-space: nowrap;
          }

          .baw-chip:empty {
            display: none;
          }

          .baw-before .baw-chip {
            right: var(--space-3, 4cqw);
          }

          .baw-after .baw-chip {
            left: var(--space-3, 4cqw);
            border-color: color-mix(
              in srgb,
              var(--baw-accent, #22c55e) 62%,
              var(--border, #334155)
            );
            color: var(--fg, #f8fafc);
          }

          .baw-divider {
            position: absolute;
            z-index: 5;
            top: 0;
            bottom: 0;
            left: calc(var(--baw-split) * 1%);
            width: 0.4cqw;
            transform: translateX(-50%);
            background: var(--fg, #f8fafc);
            pointer-events: none;
          }

          .baw-divider::after {
            content: "";
            position: absolute;
            left: 50%;
            top: 50%;
            width: min(5cqw, 7cqh);
            aspect-ratio: 1;
            transform: translate(-50%, -50%);
            border: 0.3cqw solid var(--baw-accent, #22c55e);
            border-radius: 50%;
            background: var(--fg, #f8fafc);
          }
        </style>

        <div
          id="before-after-wipe-clip"
          class="baw-clip clip"
          data-start="0"
          data-duration="4"
          data-track-index="0"
        >
          <div class="baw-stage">
            <section class="baw-panel baw-before" aria-label="Before panel">
              <div class="baw-slot" data-slot="before">
                <!-- SLOT "before": replace the children of this element with
                     your own content (img, video, or HTML). -->
                <div class="baw-default" aria-hidden="true">
                  <div class="baw-card">
                    <div class="baw-bar"></div>
                    <div class="baw-line"></div>
                    <div class="baw-line"></div>
                    <div class="baw-line"></div>
                  </div>
                </div>
              </div>
              <div class="baw-chip baw-chip-a"></div>
            </section>

            <section class="baw-panel baw-after" aria-label="After panel">
              <div class="baw-slot" data-slot="after">
                <!-- SLOT "after": replace the children of this element with
                     your own content (img, video, or HTML). -->
                <div class="baw-default" aria-hidden="true">
                  <div class="baw-card">
                    <div class="baw-bar"></div>
                    <div class="baw-line"></div>
                    <div class="baw-line"></div>
                    <div class="baw-line"></div>
                  </div>
                </div>
              </div>
              <div class="baw-chip baw-chip-b"></div>
            </section>

            <div class="baw-divider" aria-hidden="true"></div>
          </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");
            // Literal id: mount flattening strips data-composition-id from the
            // live root before this timeline registers.
            var compositionId = "before-after-wipe";
            var stage = root.querySelector(".baw-stage");
            var divider = root.querySelector(".baw-divider");
            var chipA = root.querySelector(".baw-chip-a");
            var chipB = root.querySelector(".baw-chip-b");

            var vars =
              window.__hyperframes && window.__hyperframes.getVariables
                ? window.__hyperframes.getVariables()
                : {};

            var labelA = vars.label_a == null ? "Before" : String(vars.label_a);
            var labelB = vars.label_b == null ? "After" : String(vars.label_b);
            var rawSplit = vars.rest_split == null ? 50 : Number(vars.rest_split);
            // INVARIANT: rest_split always clamps into the declared 0-100 range.
            var restSplit = Number.isFinite(rawSplit) ? Math.max(0, Math.min(100, rawSplit)) : 50;
            var rawWipeAt = vars.wipe_at == null ? 0.25 : Number(vars.wipe_at);
            var wipeAt = Number.isFinite(rawWipeAt) ? Math.max(0, Math.min(8, rawWipeAt)) : 0.25;
            // Each enum choice routes to a DIFFERENT contract token so the
            // variable stays meaningful under a theme.
            var accentColors = {
              green: "var(--brand, #22c55e)",
              blue: "var(--accent, #38bdf8)",
              violet: "var(--accent-2, #c5a3ff)",
            };
            var accent = Object.prototype.hasOwnProperty.call(accentColors, vars.accent)
              ? vars.accent
              : "green";
            // The bundler mirrors composition variables as scoped CSS custom
            // props, so this unit's own accent variable shadows the contract
            // --accent token inside the subtree ("blue" is a valid CSS color
            // and would render pure blue). When the shadow is present, fall
            // back to the literal contract value instead of var(--accent).
            var computedAccent = getComputedStyle(root).getPropertyValue("--accent").trim();
            if (
              computedAccent === "green" ||
              computedAccent === "blue" ||
              computedAccent === "violet"
            ) {
              accentColors.blue = "#38bdf8";
            }
            // INVARIANT: only none | fade | up reaches the timeline.
            var exit = vars.exit === "fade" || vars.exit === "up" ? vars.exit : "none";

            chipA.textContent = labelA;
            chipB.textContent = labelB;
            root.style.setProperty("--baw-accent", accentColors[accent]);

            // RETIME RANGE: fixed IN and OUT scale together only when D is too
            // short. HOLD is the sole elastic phase. Never use timeScale().
            var STAGE_IN_BASE = 0.32;
            var WIPE_DURATION_BASE = 1.05;
            var IN_BASE = wipeAt + WIPE_DURATION_BASE;
            var OUT_BASE = exit === "none" ? 0 : 0.5;

            var duration = Math.max(0.001, parseFloat(root.dataset.duration || "4"));
            var totalBase = IN_BASE + OUT_BASE;
            var scale = duration < totalBase ? duration / totalBase : 1;
            var IN = IN_BASE * scale;
            var OUT = OUT_BASE * scale;
            var STAGE_IN = Math.min(STAGE_IN_BASE * scale, IN);
            var WIPE_AT = wipeAt * scale;
            var WIPE_DURATION = WIPE_DURATION_BASE * scale;
            var WIPE_END = IN;
            var HOLD = Math.max(0, duration - (IN + OUT));
            var OUT_START = IN + HOLD;

            function fireSfx(id, t) {
              root.dispatchEvent(
                new CustomEvent("hf:sfx", { detail: { id: id, t: t }, bubbles: true }),
              );
            }

            // Explicit both-endpoints state makes tl.seek(0) deterministic.
            // --baw-split is the only owner of both clip and divider progress.
            // The divider starts hidden: at split 0 its knob would render
            // half-clipped at the frame edge for the whole lead-in.
            gsap.set(stage, { opacity: 0, y: 0, "--baw-split": 0 });
            gsap.set(divider, { autoAlpha: 0 });

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

            // IN: stage settle, then ONE wipe pass travels to rest_split and
            // stays there. The divider fades in as it departs the left edge.
            tl.to(stage, { opacity: 1, duration: STAGE_IN, ease: "power2.out" }, 0);
            tl.to(
              stage,
              { "--baw-split": restSplit, duration: WIPE_DURATION, ease: "sine.inOut" },
              WIPE_AT,
            );
            tl.fromTo(
              divider,
              { autoAlpha: 0 },
              {
                autoAlpha: 1,
                duration: Math.min(0.22 * scale, WIPE_DURATION),
                ease: "power1.out",
                immediateRender: false,
              },
              WIPE_AT,
            );
            tl.call(
              function () {
                fireSfx("wipe-land-soft", WIPE_END);
              },
              [],
              WIPE_END,
            );

            // HOLD: deliberately steady at the resting split.

            // OUT: only when the exit variable asks for one; exit none holds
            // the final comparison frame (frame roots own transitions).
            if (exit !== "none") {
              tl.to(stage, { opacity: 0, duration: OUT, ease: "power2.in" }, OUT_START);
              if (exit === "up") {
                tl.to(stage, { y: "-6cqh", duration: OUT, ease: "power2.in" }, OUT_START);
              }
            }

            tl.seek(0);

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

Tagged prop ui-props compare holdable before-after wipe slots.

Overview

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Code

Transitions

Data & charts

Scenes & demos

Motion & effects

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Paste it into your composition

Variables

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​Variables

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Install

Paste it into your composition

Variables

Source

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