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feat!: shimmer marked bones by default (BON-16) - #51
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hunterbecton merged 2 commits intoAug 28, 2026
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Marked bones (data-bone) were static unless a data-bone-animate scope opted in, while auto bones and the measured overlay shimmered by default. A page that mixed an aria-busy region with explicit data-bone markup showed shimmering auto bones beside frozen marked ones. bones.css now carries an unscoped shimmer rule for text, block, and container bones. The shimmer, pulse, and none scopes keep winning at higher specificity, so data-bone-animate="none" is the opt-out. The old reduced-motion rule pulsed the element carrying aria-busy, which stacked an opacity pulse on top of the bar's own animation. It is gone. The default rule and the shimmer and pulse scopes each downgrade to a slow pulse under prefers-reduced-motion: reduce, and none stays still, matching the overlay's contract. Tests: browser tests pin the default and the opt-outs by computed animation name, and a unit test pins the reduced-motion block by text, since the browser runner cannot emulate media features. The adaptive-colors fixtures now set data-bone-animate="none" so the bar's color stays in background-color, as the visual fixtures already did. Screenshot baselines are unchanged. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Limit details: You’ve used the included review currently available. 📝 WalkthroughWalkthroughMarked bones now shimmer by default. The CSS supports ChangesBone animation defaults
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to This change makes explicitly marked bones shimmer by default while preserving reduced-motion behavior and the opt-out, with no actionable merge-blocking risk remaining after normal checks and review. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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In `@apps/docs/content/docs/examples.mdx`:
- Line 160: Update the reduced-motion sentence in the Bones documentation to
clarify that the default, shimmer, and pulse animation scopes downgrade to
pulse, while none remains static; keep the surrounding animation behavior
description unchanged.
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.changeset/marked-bones-shimmer-by-default.mdREADME.mdapps/demo/components/animations-demo/animations-demo.tsxapps/docs/content/docs/examples.mdxapps/docs/content/docs/styling.mdxpackages/bones/README.mdpackages/bones/src/css/bones.csspackages/bones/tests/bones-css.test.tspackages/bones/tests/browser/adaptive-colors.test.tspackages/bones/tests/browser/default-animation.test.ts
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…ests Review follow-ups on the BON-16 branch. [data-bone="text"]::before is a zero-width space with no background or size, so animating it paints nothing. It sat in every animation selector list since the second-line bar went away, and the new default copied it into an unconditional rule. Every list now targets ::after only. The aria-busy guard in bones-css.test.ts matched the selector only when it stood alone before a brace. bones.css has no aria-busy selector at all now, so the test asserts that directly and the block-collecting helper goes. default-animation.test.ts drops the pulse-wrapper case, which repeated animation-scope.test.ts verbatim. The auto.css comment that justified its default by bones.css lacking one now gives the real reason: its selectors target unmarked leaves. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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CodeRabbit on PR #51: examples.mdx still said pulse applies regardless of the animation you set, which contradicts the none scope having no reduced-motion override. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Closes BON-16. Lands before the changesets PR #43 so the 0.4.0 notes carry this behavior change together with the BON-20 component removal.
What changed
Marked bones (
data-bone) were static unless adata-bone-animatescope opted in, while auto bones and the measured overlay shimmered by default. A page that mixed anaria-busyregion with explicitdata-bonemarkup showed shimmering auto bones beside frozen marked ones.bones.cssgains an unscoped shimmer rule for text, block, and container bones. Theshimmer,pulse, andnonescopes carry:is(:scope, :scope *), which puts them at (0,2,1) against the default's (0,1,1), so they keep winning regardless of source order.data-bone-animate="none"is the opt-out.[aria-busy="true"] { animation: bone-pulse }, pulsed the element that carriesaria-busy(every marked bone does) and stacked an opacity pulse on top of the bar's own animation. It is gone. The default rule and theshimmerandpulsescopes each downgrade to a slow pulse underprefers-reduced-motion: reduce, andnonestays still. This is the contract the overlay already follows inoverlay.ts.styling.mdxandexamples.mdx, the README's@scopecaveat, and the demo's Animations blurb now describe shimmer as the default.minorchangeset.Tests
tests/browser/default-animation.test.ts: a bare text, block, and container bone getsbone-shimmerwith no attribute anywhere, andnoneon the bone or a wrapper stops it. Computed-style assertions, same shape as the BON-17 tests.tests/bones-css.test.ts: pins the reduced-motion block by text, the same wayboundary.test.tspins the overlay's shadow sheet, since the browser runner cannot emulate media features.adaptive-colors.test.tsfixtures now setdata-bone-animate="none"so the bar's color stays inbackground-color. Its auto.css cases already did this.data-bone-animate="none", and the suite passes against darwin baselines generated before the CSS change.Review follow-up in
b4c4d9e:[data-bone="text"]::before(a zero-width space with no background or size) is dropped from every animation selector list, since animating it paints nothing and the new default would have run it on every text bone.vp test --runinpackages/bones: 208 passed.apps/demo: 110 passed.Summary by CodeRabbit
New Features
data-bone-animate="none"to disable animation andpulseto switch animation style.Documentation
Tests