perf: lighten the bar's stylesheet, listeners and DOM writes - #11
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The bar slides with `translate` instead of `transform`, so `transform` on `.sprogress-bar` is free for other effects. A Chromium trace shows its transitions still run on the compositor. The short `--sp-speed` hop is now the bar's default transition and only the `trickle` state switches to the long drift, so the `active`/`done` rule goes away, and the idle fade overrides only the transition delays. `data-sp-busy` and `aria-busy` are written to `<html>` only when the first bar shows and the last one hides: one load with two `set()` calls now makes 2 mutation records instead of 7. The default template is a static element instead of a mounted `<Bar />`. One set of Navigation API listeners now serves both cross-document and same-document navigations, keeping a hold for each kind so a `pushState` never ends a page load. The engine settles releases and `done()` through one path. `pnpm size` also measures `<RouteProgress />` and `<NavigationProgress />` tree-shaken on their own: 2363 B (was 2410) and 2099 B (was 2193) min+gzip; `style.css` is 510 B (was 534). The README and the docs quote those numbers instead of summed chunks. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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What changes
A lighter bar with the same behavior and public API.
<RouteProgress />adds 2363 B min+gzip after tree-shaking (was 2410),<NavigationProgress />2099 B (was 2193), andstyle.css510 B (was 534).style.css: the bar slides withtranslate, sotransformon.sprogress-baris free for other effects. The short hop is the default transition and onlytrickleswitches to the long drift. A Chromium trace confirms the transitions still run on the compositor.<html>busy attributes are written only on the first show and the last hide (2 mutation records per load instead of 7, with twoset()calls).<Bar />.<NavigationProgress>attaches one set of Navigation API listeners (4 onnavigationinstead of 8).pnpm sizemeasures each drop-in bar tree-shaken on its own.Checklist
pnpm format:checkandpnpm checkpassREADME.mdand the matching page underwww/src/routes/docs/are updatedpnpm changeset) if the published package changes🤖 Generated with Claude Code