Andreas Reinhold / reiniandClaude Opus 5
9f46630352
collapse.css animated `<details>`' `::details-content` from `block-size: 0` to `auto`, which needs `interpolate-size: allow-keywords` (Chrome 129 and nothing else) and a `content-visibility` held through the close with `allow-discrete` (not Firefox), so in Firefox and Safari the section snapped open and shut. No stylesheet can do it there. resources/js/collapse.js animates the `<details>` itself, the same way in every engine: a Web Animation of its `block-size` from the height it is drawn at to the height it is going to, on the fast spatial spring's tokens, with `overflow: clip` and a `min-block-size` that keeps the summary whole through the spring's overshoot, all inside the keyframes, so nothing is left in `style`. Content below moves with it. Opening sets `open` at once and grows the height; closing keeps `open` while the height goes, marks `data-md-collapse-closing` so the chevron turns back at the start, and drops `open` (and fires `toggle`) when the height has. A press mid-way turns it round from the height it has reached. The CSS animation is gone, so Chrome takes the same path and never animates twice. Routes: a press on the summary (pointer, Enter, Space) is taken over; the Alpine and Livewire bindings call `materialCollapse()` from the view's `x-effect` (its first call, as Alpine starts, sets the state at once); a `name` group's open member closes on the same spring, its `name` lifted for the close so the browser's exclusivity does not shut it first and put back once closed. Anything else that sets `open` (find-in-page, an application's own script) stays instant, as the browser draws it, and is followed. Under reduced motion every route is the browser's own. Browser tests in Chrome, Firefox and Safari catch the height part-way open and shut (and what is under it moving) from a press and from the Alpine binding, the chevron turning at the start of a close, the clip while it moves, Enter on the summary, a reversal mid-way, a name group, and reduced motion. The four motion tests fail on main in Firefox and Safari. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
85 lines
3.6 KiB
CSS
85 lines
3.6 KiB
CSS
/*
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* <x-collapse>: not an M3 component — M3 has expandable list items and menu expansion but no
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* standalone disclosure — built on the native `<details>` so it opens without script, keeps its
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* state through a Livewire morph, and is announced as a disclosure by the browser. Judged against
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* foundations rather than any M3 component spec (docs/audits/m3-alignment/containment.md, C-24).
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*
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* The height eases open and shut on the fast spatial spring, the same one that turns the chevron,
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* from resources/js/collapse.js: it animates the `<details>`' own `block-size`. This file cannot —
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* `interpolate-size` (for `0 -> auto`) is Chrome's alone, and Firefox does not hold the content's
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* `content-visibility` through a close — so Firefox and Safari used to snap open and shut. While a
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* close runs, `open` is still set and `data-md-collapse-closing` turns the chevron back at its
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* start. Under reduced motion the duration token is zero (tokens/motion.css), and the section
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* snaps, as the browser draws it.
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*
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* `data-md-variant="filled"` is a surface-container tile with a large corner; the summary inherits
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* it (`border-radius: inherit`) so the shared `md-state-layer`'s own `::before`, which also
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* inherits, draws inside the same shape. `md-state-layer` and `md-focus-ring`
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* (foundation/interaction.css) sit on the summary; this file only refines their target — the
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* 48px summary height, the icon and chevron colour — never their opacities or ring.
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*
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* Icon-to-title and title-to-chevron gaps are a literal 12px: the measurement scale has no 12
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* (`space125` is 10px), as alert.css's gap. Every part is matched as its own `<details>`' child, so
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* a collapse nested in a filled one takes neither its padding nor its turned chevron.
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*/
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@layer material.reset, material.tokens, material.base, material.layout, material.components, material.text, material.visibility;
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@import './icon.css';
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@layer material.components {
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[data-md-collapse][data-md-variant='filled'] {
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border-radius: var(--md-sys-shape-corner-lg);
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background-color: var(--md-sys-color-surface-container);
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}
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[data-md-collapse-summary] {
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display: flex;
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min-block-size: var(--md-sys-measurement-space600);
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align-items: center;
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gap: 12px;
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border-radius: inherit;
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cursor: pointer;
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list-style-type: none;
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font: var(--md-sys-typescale-title-md);
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letter-spacing: var(--md-sys-typescale-title-md-tracking);
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&::-webkit-details-marker {
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display: none;
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}
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}
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[data-md-collapse][data-md-variant='filled'] > [data-md-collapse-summary] {
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padding-inline: var(--md-sys-measurement-space200);
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}
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[data-md-collapse-icon] {
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color: var(--md-sys-color-on-surface-variant);
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}
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[data-md-collapse-title] {
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min-width: 0;
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flex: 1 1 0%;
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}
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[data-md-collapse-chevron] {
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color: var(--md-sys-color-on-surface-variant);
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transition: rotate var(--md-sys-motion-spatial-fast-duration) var(--md-sys-motion-spatial-fast);
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}
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[data-md-collapse][open]:not([data-md-collapse-closing]) > [data-md-collapse-summary] > [data-md-collapse-chevron] {
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rotate: 180deg;
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}
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[data-md-collapse-body] {
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padding-block: var(--md-sys-measurement-space50) var(--md-sys-measurement-space200);
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color: var(--md-sys-color-on-surface-variant);
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font: var(--md-sys-typescale-body-md);
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letter-spacing: var(--md-sys-typescale-body-md-tracking);
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}
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[data-md-collapse][data-md-variant='filled'] > [data-md-collapse-body] {
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padding-inline: var(--md-sys-measurement-space200);
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}
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}
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