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264 lines
13 KiB
Markdown
264 lines
13 KiB
Markdown
# Composition Patterns
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How to architect a project — when to inline everything in one HTML, when to split into sub-compositions, what the `index.html` orchestrator looks like at scale, and the common sub-composition archetypes seen in real projects. Pair with `minimal-composition.md` (single-file shape) and `sub-compositions.md` (mechanics of a sub-comp file).
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## Two Architectures
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| | Monolithic (single file) | Modular (sub-compositions) |
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| --------------------- | ------------------------------------------------------- | ------------------------------------------------------------------------------------ |
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| Project layout | `index.html` only | `index.html` + `compositions/<scene>.html` per scene |
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| Where scenes live | Inline `<section class="clip">` siblings under the root | Each scene is a separate file wrapped in `<template>` |
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| Timeline registration | One timeline keyed at the root's `data-composition-id` | Root timeline (often near-empty) + one timeline per sub-comp, each keyed by its `id` |
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| Routing entry | `references/minimal-composition.md` | `references/sub-compositions.md` |
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Both architectures use the same runtime contract — `data-*` attributes + `window.__timelines[id]`. The choice is structural, not behavioral.
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### Pick monolithic when
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- The whole video is one continuous scene with no hard cuts.
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- Scenes share heavy state (one canvas/WebGL context spanning the whole video, a single SVG that morphs across all beats).
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- Total scope is small (~200–400 lines of markup + script).
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- No scene is reused across projects.
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### Pick modular when
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- The video has clear scene cuts — each scene is its own segment of the timeline.
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- Some scenes are large (>100 lines of markup or significant scripted animation).
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- A scene is reusable (kinetic intro, end-card logo lockup, a transition).
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- The video has a continuous audio track over multiple visual segments. Keep audio at the root, visual segments as sub-comps.
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- You want to author/iterate on scenes in isolation (preview a single sub-comp file directly).
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### Refactor between them
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Conversion is mechanical and reversible. To lift a monolithic scene into a sub-comp: wrap the scene's markup + scoped CSS + its slice of the parent timeline into a `<template>`, save as `compositions/<scene>.html`, replace the inline content in `index.html` with a slot `<div data-composition-src="compositions/<scene>.html">`, and have the sub-comp register its own timeline at `window.__timelines["<scene>"]`. The parent timeline shrinks accordingly.
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If a monolithic project is approaching three or more scene cuts, prefer modularizing _before_ adding the next scene. Mixed projects where some scenes are inline and siblings are in `compositions/` are the hardest to maintain.
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## Modular Orchestrator Pattern
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When using sub-compositions, `index.html` should be **thin**. Its job is to declare slots, lay them out in time, mount the audio track, and register a (usually empty) root timeline. All scene animation lives inside the sub-comps.
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```html
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<!doctype html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<script src="https://cdn.jsdelivr.net/npm/gsap@3.14.2/dist/gsap.min.js"></script>
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<style>
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body {
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margin: 0;
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background: #000;
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}
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#root {
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position: relative;
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width: 1920px;
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height: 1080px;
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overflow: hidden;
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}
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/* Sub-comp slots stretch to fill the root. */
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[data-composition-id="root"] > div[data-composition-src] {
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position: absolute;
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inset: 0;
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}
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</style>
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</head>
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<body>
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<div
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id="root"
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data-composition-id="root"
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data-width="1920"
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data-height="1080"
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data-duration="30"
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>
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<!-- Sequential scenes — each one a sub-composition slot. -->
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<div
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id="el-intro"
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data-composition-id="intro"
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data-composition-src="compositions/intro.html"
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data-start="0"
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data-duration="6"
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data-track-index="1"
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></div>
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<div
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id="el-body"
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data-composition-id="body"
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data-composition-src="compositions/body.html"
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data-start="6"
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data-duration="18"
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data-track-index="1"
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></div>
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<div
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id="el-outro"
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data-composition-id="outro"
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data-composition-src="compositions/outro.html"
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data-start="24"
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data-duration="6"
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data-track-index="1"
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></div>
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<!-- Continuous audio at the root — survives scene cuts. -->
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<audio
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id="el-bgm"
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src="assets/bgm.mp3"
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data-start="0"
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data-duration="30"
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data-track-index="10"
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data-volume="0.6"
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></audio>
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</div>
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<script>
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window.__timelines = window.__timelines || {};
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window.__timelines["root"] = gsap.timeline({ paused: true });
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</script>
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</body>
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</html>
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```
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Key properties of this layout:
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- **Visual scenes on the same `data-track-index`** (e.g. `1`). Sequential — they cannot overlap on the same track. For a cross-fade between two scenes, put one on a higher track and overlap their times by the fade duration.
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- **Audio on a separate, higher track index** (e.g. `10`). Keeps the linter's overlap rules clear of any visual collisions.
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- **Root timeline is near-empty.** All animation lives in the sub-comps. A root-level fade-to-black at the very end is fine; do not stage a parallel animation track from the root.
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- **Host slot ids** use `el-<name>` or `<scene-id>`. The slot's `data-composition-id` must still equal the sub-comp's internal id (see `sub-compositions.md`).
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## Sub-Composition Archetypes
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### A. Content scene (default)
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The sub-comp contains the scene's full DOM, scoped CSS, and timeline. This is the standard pattern in `sub-compositions.md` — most scenes are this.
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### B. Host media + main-timeline driver (REQUIRED for any `<video>`/`<audio>`)
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Media playback only works when the `<video>`/`<audio>` is a **direct child of the host root** — never inside a sub-comp `<template>` (it would render blank/black). This is not optional or "for media that spans scenes"; it applies to every clip, including a scene-specific one. The scene's sub-comp keeps the frame/shell; the media is a host sibling positioned over it.
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A sub-comp timeline **cannot** drive host elements (a global selector or `document.querySelector` does not resolve across the boundary). So author the media's per-scene motion (scale/opacity/morph/tilt/breathing) on the **main timeline** in `index.html`, at **global time** = scene-local time + the scene slot's `data-start`.
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```html
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<!-- index.html (host) -->
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<div
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id="el-final"
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data-composition-id="final-anim"
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data-composition-src="compositions/final-anim.html"
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data-start="20"
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data-duration="6"
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data-track-index="1"
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></div>
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<!-- media is a DIRECT root child; sits over the sub-comp's frame -->
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<video
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id="final-video"
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class="clip"
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src="assets/final.mp4"
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data-start="20"
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data-duration="6"
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data-track-index="2"
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muted
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playsinline
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style="position:absolute; left:360px; top:100px; width:1200px; height:680px; object-fit:cover; border-radius:24px;"
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></video>
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<script>
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// MAIN timeline drives the host video. Global time: scene starts at 20.
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window.__timelines = window.__timelines || {};
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const main = window.__timelines["main"];
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main.fromTo(
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"#final-video",
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{ scale: 1.4, filter: "blur(14px)" },
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{ scale: 1.0, filter: "blur(0px)", duration: 0.9, ease: "power3.out" },
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20,
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); // = slot data-start (+ any scene-local offset)
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</script>
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<!-- compositions/final-anim.html — frame/shell only, no <video>, no host-element animation -->
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<template>
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<div
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data-composition-id="final-anim"
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data-width="1920"
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data-height="1080"
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data-duration="6"
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style="position:absolute; inset:0; pointer-events:none;"
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>
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<script>
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window.__timelines = window.__timelines || {};
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const tl = gsap.timeline({ paused: true });
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// animate ONLY this sub-comp's own elements here (labels, frame, overlays)
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window.__timelines["final-anim"] = tl;
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</script>
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</div>
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</template>
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```
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Caveats:
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- The host media must be a direct root child and exist in the DOM (static in `index.html`) — it always is.
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- Clip lifecycle owns the media element's visibility across its `[data-start, data-start+data-duration]` window. The main-timeline opacity/scale tweens compose with it fine; for an opacity reveal/crossfade prefer a host **wrapper** so you are not fighting the lifecycle on the media element itself.
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- Two media elements sharing the same `src` + `data-start` trigger `duplicate_media_discovery_risk` (benign — both still render).
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### C. Multi-scene merge
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When several beat-level scenes share continuous state — a chat thread that grows, a persistent headline word that carries across the cut, a single canvas with internal phase changes — collapse them into one sub-comp and use **internal phase divs** rather than multiple sub-comp slots.
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```html
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<!-- compositions/act2-merged.html -->
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<template>
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<div data-composition-id="act2-merged" data-width="1920" data-height="1080" data-duration="9">
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<style>
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[data-composition-id="act2-merged"] .phase {
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position: absolute;
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inset: 0;
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opacity: 0;
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}
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</style>
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<div class="phase" id="phase-a">…</div>
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<div class="phase" id="phase-b">…</div>
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<div class="phase" id="phase-c">…</div>
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<script>
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window.__timelines = window.__timelines || {};
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const tl = gsap.timeline({ paused: true });
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tl.set("#phase-a", { opacity: 1 }, 0);
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tl.to("#phase-a", { opacity: 0, duration: 0.4 }, 3.0);
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tl.set("#phase-b", { opacity: 1 }, 3.0);
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// …
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window.__timelines["act2-merged"] = tl;
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</script>
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</div>
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</template>
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```
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Reach for this over multiple sequential slots when scenes share DOM, share a canvas, or need to cross-fade with persistent elements (a headline that survives the cut between phases). Each phase is just a div inside the same sub-comp — the parent timeline never has to know about the internal phase boundaries.
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### D. Audio at root, reactive visual inside
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Audio always lives at the host (`index.html`) as a root-level `<audio>` so playback survives scene cuts. A sub-comp that visualizes audio should read a **pre-baked** frequency curve at init, then sample the baked curve from its timeline — the visual must still be a deterministic function of `tl.time()`, not of `audio.currentTime`. See `determinism-rules.md` and `hyperframes-creative` for the authoring pattern.
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## Naming Conventions
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| Thing | Convention | Example |
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| ----------------------------------- | ------------------------------------------- | ------------------------------------------ |
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| Sub-comp file | `compositions/<scene-id>.html` | `compositions/act0-intro-bell.html` |
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| Sub-comp `<template>` id (optional) | `<scene-id>-template` | `<template id="act0-intro-bell-template">` |
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| Sub-comp root `data-composition-id` | `<scene-id>` (must match host slot) | `data-composition-id="act0-intro-bell"` |
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| Timeline registry key | matches `data-composition-id` | `window.__timelines["act0-intro-bell"]` |
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| Host slot `id` | `el-<short>` or `<scene-id>` | `id="el-intro"`, `id="act0"` |
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| Element ids inside a sub-comp | prefix with the scene id | `#act0-bell`, `#b1-tape` |
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| Audio at root | `data-track-index` well above visual tracks | `10` while visuals use `1` |
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The `-template` suffix on `<template>` is conventional but not required — the runtime extracts contents from whichever `<template>` is in `<body>`, regardless of id. The prefix on inner element ids is the only safeguard against id collisions when multiple sub-comps are mounted into the same host page at once.
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## Editing Existing Projects
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Before adding or modifying scenes, identify which architecture is in use:
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```bash
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ls compositions/ 2>/dev/null && echo "modular" || echo "monolithic"
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```
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- In a **monolithic** project, add new scenes as inline `<section class="clip">` elements with a non-overlapping `data-start` and a sensible `data-track-index`, and extend the existing single timeline.
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- In a **modular** project, match the pattern: add a new file under `compositions/`, add a slot in `index.html`, keep the root timeline thin. Do **not** start inlining new scenes into `index.html` when sibling scenes are sub-comps — the inconsistency is the worst of both worlds.
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- If a monolithic project needs a third or fourth scene cut, lift each scene into a sub-comp before adding more. The conversion is mechanical (see "Refactor between them" above).
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When picking the slot's `data-start`/`data-duration`, prefer continuing the existing sequencing convention (adjoining starts, deliberate overlaps for cross-fades). Don't introduce a new track index unless you actually need parallel visual layers — most sequential-scene projects use exactly one visual track.
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