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hyperframes/registry/components/split-tilt-cards/README.md
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Miguel Ángel 9734578e60 feat(registry): bring back the video-primitive moves (#3169)
Restores the 208 catalog items reverted after their previews 404'd in
production, this time on the payload mechanism rather than the .html files
that caused the outage.

The generator no longer writes a preview document to docs/public. That writer,
and the machinery under it, existed only to produce files the docs host
discards, so it is gone rather than bypassed. Items now embed the composition
itself via a payload, which is what the previous change already does for the
items that were already in the catalog.

The variables explorer is parked, not restored: it drove its preview through
the same unpublished .html path, so it would have shown an empty frame. Items
that declare variables get the live player plus the static variables table, and
reconnecting the explorer to payloads is a follow-up.
2026-08-10 18:46:03 -04:00

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Markdown

# split-tilt-cards
Two equal-weight cards arrive from opposite wings, each carrying a mirrored
3D rotateY book-open tilt (+18deg left, -18deg right) under one shared stage
perspective, with soft box-shadows falling outward from the tilt. A pill
badge spring-pops at each card's inner edge (left first, right ~0.3s behind:
the one sanctioned overshoot, kept small), then the pair holds with a
barely-there phase-opposed idle float and settles dead still. The eye reads
the two cards as a balanced comparison: an A/B, a before/after, two
complementary capabilities weighed simultaneously.
This realizes the comparison-split blueprint's signature move as its own
unit. Not for more than 2 items (use `grid-card-assemble`) or sequential
steps. For a divider that wipes one state over another, use
`before-after-wipe`.
## Files
- `split-tilt-cards.html`: the mountable sub-composition (install target:
`compositions/components/split-tilt-cards.html`).
- `registry-item.json`: registry metadata and the variables block.
- `demo.html`: a 1920x1080 standalone host that mounts the primitive with
non-default variables.
## Variables
| id | type | default | notes |
| --------- | ------ | -------- | ------------------------------------------------------------------------- |
| `label_a` | string | `Before` | mono header on the left card; empty string hides it |
| `label_b` | string | `After` | mono header on the right card; empty string hides it |
| `badge_a` | string | `v1` | inner-edge pill on the left card; empty string disables that pop |
| `badge_b` | string | `v2` | inner-edge pill on the right card; empty string disables that pop |
| `accent` | enum | `green` | `green` maps to `--brand`, `blue` to `--accent`, `violet` to `--accent-2` |
| `exit` | enum | `none` | `none` holds the final spread; `fade` and `up` release the stage |
Envelope: IN = 2.15s (left card lands 0 to 1.1s, right 0.2 to 1.3s, badge A
pops at 1.45s, badge B at 1.75s), OUT = 0.5s only when `exit` is `fade` or
`up`, HOLD is the sole elastic phase. During HOLD the two cards run whole
2.0s phase-opposed float cycles (left dips as right rises, every cycle starts
and ends at rest) and always finish with a 0.3s dead-still window. Sync
points: `badge-pop-a` at 1.85s and `badge-pop-b` at 2.15s (`hf:sfx` id
`badge-pop-soft` fires at each landing).
## The slot mechanism
The primitive ships two named slot panels inside its `<template>`:
```html
<div class="stc-slot" data-slot="card-a">...</div>
<div class="stc-slot" data-slot="card-b">...</div>
```
Each slot's default children are a token-styled wireframe (muted on the left
card, accent-tinted on the right), so an untouched mount still reads as a
tasteful comparison. To show your own content, install the component and
**replace the children of each `[data-slot]` element in your installed
copy** (the runtime clones only the primitive's own template on mount, so
slot content lives in the component file, not on the host clip).
Rules:
- Direct `img`/`video` children are automatically sized to cover the slot
(`object-fit: cover`). Arbitrary HTML works too; size it in `cqw`/`cqh`.
- Keep the label headers and badge pills alone; they render outside the
slots and ride the same tilt and float as the card.
- The tilt is carried by the card, so slot content tilts with it; keep
content readable at 18 degrees (avoid dense small text).
## Worked example
Install, then fill the slots with two screenshots:
```bash
npx hyperframes add split-tilt-cards
```
In `compositions/components/split-tilt-cards.html`, replace each slot's
default block:
```html
<div class="stc-slot" data-slot="card-a">
<img src="../../assets/plan-free.png" alt="" />
</div>
...
<div class="stc-slot" data-slot="card-b">
<img src="../../assets/plan-pro.png" alt="" />
</div>
```
Mount it from a host composition like any sub-composition:
```html
<div
class="clip"
data-composition-id="split-tilt-cards"
data-composition-src="./components/split-tilt-cards.html"
data-variable-values='{"label_a":"Free","label_b":"Pro","badge_a":"$0","badge_b":"$29","accent":"violet"}'
data-start="2"
data-duration="5"
data-track-index="0"
></div>
```
The cards land 1.3s after the clip mounts, the badges punctuate by 2.15s,
and the spread holds with a barely-there float for the rest of the clip
window (`exit` defaults to `none`; frame roots own scene transitions).