calesthio/openmontage
The HyperFrames composition contract — build one renderable project.
npx skills add calesthio/openmontage --skill hyperframes-core
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The HyperFrames composition contract — build one renderable project.
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npx skills add calesthio/openmontage
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SKILL.md
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SUMMARY.md
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HyperFrames renders video from HTML. A composition is an HTML file whose DOM declares timing with data-* attributes, whose animation runtime is seekable, and whose media playback is owned by the framework.
This skill is the technical contract — how to build one hyperframes project. The body below is the build guide; per-topic detail lives in references/ (index next), read on demand. Other concerns live in the sibling domain skills — hyperframes-animation, hyperframes-creative, hyperframes-media, hyperframes-cli, hyperframes-registry. The capability map in /hyperframes says what each one covers.
| File | Read it to… |
|---|---|
references/minimal-composition.md |
start from the smallest renderable composition skeleton |
references/composition-patterns.md |
choose monolithic vs modular; structure a modular index.html; pick a sub-comp archetype |
references/data-attributes.md |
look up any data-* (root / clip / sub-comp host / legacy aliases); use class="clip" |
references/tracks-and-clips.md |
pick data-track-index, handle same-track overlap / z-index, time a clip relative to another |
references/sub-compositions.md |
wire a sub-composition (host attrs, <template>, per-instance vars) and animate inside it |
references/variables-and-media.md |
declare variables; place <video>/<audio>, set volume, trim |
references/determinism-rules.md |
build a seekable timeline; determinism bans; the animatable-property allowlist; layout / text fit |
references/full-screen-motion.md |
author full-frame motion with shared backgrounds |
references/storyboard-format.md |
author a STORYBOARD.md plan (+ the parsed manifest) |
references/script-format.md |
author the optional SCRIPT.md locked narration |
references/subagent-dispatch.md |
map subagent dispatch verbs (parallel fan-out / background / wait) to your harness |
references/tailwind.md |
work in a Tailwind v4 project (init --tailwind; runtime contract differs from Studio's v3) |
For animation runtime specifics (GSAP API, Lottie, Three.js, etc.) go to hyperframes-animation → adapters/<runtime>.md.
index.html) — root <div data-composition-id="…"> sits directly in <body>, no <template> wrapper (wrapping it hides all content and breaks rendering).data-composition-src) — root must be wrapped in <template>.⚠ Transport rule: the runtime only clones
<template>contents; everything outside (incl.<head>styles/scripts) is discarded — put<style>/<script>inside the template.
⚠ Host-id rule: the host slot'sdata-composition-idmust exactly equal the inner template'sdata-composition-idand thewindow.__timelines["<id>"]key — no-mount/-slot/-hostsuffix.
File shape, host wiring, and the pre-render checklist → references/sub-compositions.md.
The standalone root needs an explicit sized box (width/height in px), and every ancestor down to a height:100% element must have a resolved height — otherwise a flex/100% child collapses to ~0 and content piles into the top-left corner. lint/validate/inspect do not catch this. Skeleton → references/minimal-composition.md.
Each composition registers exactly one gsap.timeline({ paused: true }) at window.__timelines["<id>"] (key = root data-composition-id), built synchronously at page load. Render duration = root data-duration, not timeline length. Don't manually nest sub-timelines into the host. Full contract (incl. non-GSAP runtimes) → references/determinism-rules.md + hyperframes-animation/adapters/.
lint/validate/inspect won't catch)Surfaced here; full rationale in the linked reference. Do not violate:
Math.random / network / input-state; no repeat: -1 (use a finite count). → determinism-rules.mddisplay/visibility; no gsap.set on later-scene clips. → determinism-rules.md<br> in body text; transformed elements must be block-level + sized; pulsing absolute decoratives need peak clearance. → determinism-rules.md<video>/<audio> must be a direct child of the host root (never inside a sub-comp <template>/wrapper); the framework owns playback. → variables-and-media.mdid must be unique across the assembled page; inside a sub-comp, prefix ids with the composition id (#<id>-hero). Duplicate <video>/<img> ids render blank — the producer injects frames by getElementById, and cross-file dupes slip past lint. → composition-patterns.mdposition:absolute; inset:0), never on the composition root itself — the producer's frame compositing can drop the root element's own background (the frame renders black) even though preview/snapshot show it correctly. → composition-patterns.mddata-track-index or adjust surrounding timing intentionally.data-composition-id before wiring the host.Use hyperframes-cli for command details
npx hyperframes lint passes (0 errors)npx hyperframes validate passes (0 console errors)npx hyperframes inspect passes (0 errors)npx hyperframes snapshot --at <midpoints> and eyeball each framenpx hyperframes preview for review (the user can edit anything in Studio's timeline)npx hyperframes render only after the user approves