mirror of https://github.com/heygen-com/hyperframes.git synced 2026-09-03 12:54:29 +00:00

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Miguel Angel Simon Sierra cf7c1d7609 docs(cli,skills): teach check as the canonical verification gate

Scaffolded projects' npm run check now invokes the single check command
instead of chaining lint, validate, and inspect (three Chrome boots
become one). The CLI skill, its correctness reference, the entry skill's
capability map, README/docs catalog rows, the Mintlify CLI page (new
check section, deprecation banner on inspect), template CLAUDE/AGENTS
(byte-identical), root CLAUDE/AGENTS, and every creation-workflow skill
that taught the old sequence all point at check. snapshot keeps its
standalone sections; validate/inspect stay documented as deprecated
aliases with their check equivalents.

2026-07-10 13:30:09 -04:00

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Data Attributes Reference

Every HyperFrames composition uses data-* attributes to declare timing and structure to the framework. This is the full attribute table — pair with tracks-and-clips.md for the rules behind data-track-index.

Composition Root

Every renderable composition needs one root element:

Attribute	Required	Meaning
`data-composition-id`	Yes	Unique ID. Must match the animation registry key on `window.__timelines`.
`data-width` / `data-height`	Yes	Pixel frame size. Common values: `1920x1080`, `1080x1920`, `1080x1080`.
`data-duration`	Conditional*	Render duration in seconds (total length / frame count), not the GSAP timeline length. Read once at compile time, like `data-width` / `data-height`: a static root `data-duration` is locked before scripts run, so a script (`root.setAttribute("data-duration", ...)`) or a `--variables`-driven value cannot change the render length. To vary length per render, author the root `data-duration` directly. (A clip's `data-duration` is different: re-read from the live DOM, so scripts/variables can drive it.) Only when the root omits `data-duration` does the renderer derive total length from the live DOM / timeline after scripts run.
`data-fps`	No	Optional frame rate hint. CLI render flags can override output fps.
`data-composition-variables`	No	JSON array of variable declarations (on `<html>`). See `variables-and-media.md`.

*data-duration is optional whenever the runtime can auto-infer duration: a registered GSAP timeline, a finite CSS animation, a finite WAAPI element.animate(), or a registered Lottie animation. It is required for Three.js (no auto-inference), for infinite/unbounded CSS or WAAPI animations, and for any composition with no GSAP timeline and no animation signal at all. npx hyperframes lint enforces this (root_composition_missing_duration_source). See determinism-rules.md → "Duration Contract For Non-GSAP Runtimes" for the per-runtime breakdown.

The root should be position: relative, have explicit pixel dimensions, and hide overflow unless intentionally composing outside the frame.

Clip Attributes

Timed child elements are clips. class="clip" is required on visible timed elements (<div>, <img>, etc.) — without it the runtime keeps the element visible for the whole composition, ignoring data-start / data-duration. Omit on <video> (framework manages visibility directly) and <audio> (no visual).

Clips must be DIRECT children of the composition root. A clip nested inside a wrapper <div> is not registered — most visibly, a <video> in a wrapper is never seeked/decoded and renders black. To wrap/transform a clip, put the wrapper inside the clip, or animate the clip element itself; do not wrap the clip. (<video>/<audio> additionally must be at the host root, never in a sub-comp <template> — see variables-and-media.md.)

Attribute	Required	Meaning
`id`	Yes	Stable DOM ID for linting, timeline targets, and debugging.
`data-start`	Yes	Start time in seconds, or a supported clip-time reference.
`data-duration`	Required for `div`, `img`, and sub-compositions	Duration in seconds. Video/audio can default to media duration when known.
`data-track-index`	Yes	Timeline track. Clips on the same track must not overlap.
`data-media-start`	No	Offset into the media source, in seconds.
`data-volume`	No	Static audio volume, `0` to `1`, default `1`. For fades, animate `volume` on the timeline instead (see `variables-and-media.md`).
`data-has-audio`	No (`<video>` only)	`"true"` to declare the video carries an audio track when auto-detection would miss it.

Visibility window is inclusive of both ends. A clip shows while start ≤ t ≤ start + duration — it still renders at exactly t = start + duration, so the final frame holds the animation's resolved end state (the runtime does not hide it one frame early). A reveal/entrance that lands on data-duration is therefore visible on the last frame; you do not need to finish it before data-duration just to guarantee the end state renders. (Climax-dwell guidance in /hyperframes-animation is about pacing, not this boundary.)

Sub-Composition Host Attributes

When a clip is a sub-composition host (loads another composition file):

Attribute	Required	Meaning
`data-composition-id`	Yes	The internal composition ID of the loaded file.
`data-composition-src`	Yes	Path to the sub-composition HTML file.
`data-width` / `data-height`	Yes	Render dimensions for the sub-composition instance.
`data-variable-values`	No	Per-instance variable overrides as JSON. See `variables-and-media.md`.
`data-var-src`	No	Binds the element's `src` to a declared variable id (media/image substitution, authored src = fallback).
`data-var-text`	No	Binds the element's own text to a scalar variable id; children are preserved.

See sub-compositions.md for the full wiring pattern.

Authoring Hints

id="root" — template convention used by scaffolds and the transition catalog so CSS can target the composition root with #root instead of [data-composition-id="main"]. Not required by the runtime, but consistent with the rest of the ecosystem.
class="clip" — required runtime visibility marker on visible timed elements (<div>, <img>, …). See Clip Attributes above.
data-layout-allow-overflow — tells hyperframes check that overflow on this element (or its descendants) is intentional. Notes:
- inspect measures getBoundingClientRect at sampled timestamps, not rendered pixels — overflow: hidden clips the visual but does not suppress an inspect overflow finding. This attribute is the escape hatch; CSS overflow is not.
- Can be set on the composition root as well as on any child. When the cited offender is div.<comp>-root inside div.<comp>-root (the root reports its own children's union as overflowing), the fix goes on the root, not on individual text descendants — shrinking font sizes will not converge.
- In a multi-scene group_wN.html (continue runs), every scene-local element stays in the DOM during the other scenes' time windows; the layout-box union almost always overflows the canvas during morph seams. Mark the root and every scene-local primary/supporting element with this attribute at construction, not after inspect flags it.
- Blast radius — it silences more than inspect. The attribute is inherited down the subtree (the perception probe walks ancestors), so it also suppresses the rendered-perception checks text-clipping, content-cramped-container, and foreground-over-panel for every descendant. Putting it on a persistent panel that also hosts real foreground content disables collision checks on that content for the panel's whole lifetime. Prefer the narrowest opt-out: scope it to the smallest decorative wrapper, or use per-element data-layout-bleed="true" for one intentional primary-text crop. The two canvas/edge checks primary-offscreen and foreground-over-panel deliberately run even under allow-overflow, so it cannot hide a wordmark sliced by the frame or text bleeding onto a panel edge.
data-layout-ignore — exclude this element from layout audits entirely.

Legacy / Removed Attributes

These names appear in older projects and examples. Use the current names when authoring or editing:

Legacy name	Use instead
`data-layer`	`data-track-index`
`data-end`	`data-duration`

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