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Sample the springs over M3's web durations, and add the Standard scheme

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bin/springs.mjs is the sampler behind motion.css: damping ratio and stiffness in,
the 49-point linear() and the settle time out. Run with --settle it reproduces
the six curves the file carried byte for byte, so only the window changed.

Each spring is now sampled over the duration M3 publishes for the web (spatial
350/500/650 ms, effects 150/200/300 ms) instead of stopping at its own settle
time, so the *-duration tokens read Google's numbers. Sampling stays in real
time — point i is the spring at duration × i / 48 — so the bounce lands at the
same millisecond as before; a longer duration just holds the tail flat at 1, and
a shorter one pins the last point, at most 0.3% of the travel in one frame. Each
token's comment records damping, stiffness, settle time and sampled duration.

M3's second motion scheme is here too: [data-motion="standard"] swaps the three
spatial springs (damping 0.9, 0.2% overshoot instead of 9%) and their durations;
the effects springs sample identically in both schemes, so they are shared. The
reduced-motion block names both selectors, so it still zeroes every duration.

Plan: docs/plans/material-3-alignment.md step 5, findings core C8, C9.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
This commit is contained in:
Andreas Reinhold / reini
2026-09-14 05:29:32 +02:00
co-authored by Claude Fable 5.1
parent 2feb623ec0
commit 5b0ca26857
5 changed files with 289 additions and 28 deletions
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resources/boost/skills/livewire-material-development/SKILL.md
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@@ -84,7 +84,7 @@ Tailwind's default palette is cleared: every colour class names an M3 role. `tex
- Type: `type-{display|headline|title|body|label}-{lg|md|sm}` and `type-emphasized-…` — M3's 15 styles and their emphasized twins, one weight step heavier, rounder, with their own tracking. Never assemble `text-*`, `leading-*` and `tracking-*` by hand; a utility carries size, line height and tracking together. Emphasis is deliberate and one element at a time (M3 asks for it on badges, primary buttons, selected rows, headlines), so a regular utility inside an emphasized one goes back to plain. The font is Google Sans Flex (`font-sans`).
- Shape: `rounded-corner-{none|xs|sm|md|lg|lg-increased|xl|xl-increased|xxl|full}`.
- Elevation: `shadow-elevation-{1…5}` — for what floats over content, not for panels (a panel separates by its container tone).
- Motion: `ease-spatial-{fast|default|slow}` (position, size, shape; springs that overshoot) and `ease-effects-{fast|default|slow}` (colour, opacity). Always pair an easing with its duration: `duration-(--md-sys-motion-spatial-fast-duration) ease-spatial-fast`. Reduced motion zeroes the durations.
- Motion: `ease-spatial-{fast|default|slow}` (position, size, shape; springs that overshoot) and `ease-effects-{fast|default|slow}` (colour, opacity, which never overshoot). Always pair an easing with its duration: `duration-(--md-sys-motion-spatial-fast-duration) ease-spatial-fast` — M3's published web durations, spatial 350/500/650 ms and effects 150/200/300 ms. `motion.scheme` in the config picks `expressive` (the default, with the bounce) or `standard` (minimal bounce), which the head script writes to `<html data-motion>` and which swaps the three spatial springs; a component names a spring, never a scheme. Reduced motion zeroes every duration in both schemes.
- States: `state-layer` (M3's hover/focus/press overlay; makes the element `relative` and `isolate`), `focus-ring` (keyboard focus indicator), `link` (a link in running text).
- `dark:` follows the page's theme (`data-theme`), not the operating system.
- `x-figure` on an element holding one number counts it up on first appearance and on change.