hansdezwartandClaude Opus 5
b438630796
The readout hung and then skipped numbers in a focused desktop window. render() runs every animation frame and was writing unconditionally — measured at 11 DOM mutations per frame — whether or not anything had changed. Two of those are the .time text node, a glyph run up to 190px, so every frame forced a style recalc and a full relayout to redraw digits that turn over once a second. Routing the per-frame writes through change guards takes a steady frame from 11 writes to 0. The timing itself was never at fault and is untouched here. elapsed() is one subtraction from a single monotonic performance.now() stamp and the reserve is debited once, in tap(), so nothing accumulates per frame and a dropped frame cannot cost or gift anyone a millisecond. Measured against wall clock over a running turn: 0.0000ms drift across 5s, 12s and 17s segments. Also fixes a real skip in fmt(). It switched from m:ss to tenths at ms < 10000 with both branches rounding up, so the coarse branch read a second high: counting down gave 0:11 for a full second, 0:10 for a single millisecond, then 10.0. Handing 10000ms to the tenths branch gives a monotone 0:11 -> 10.0 -> 9.9. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
34 lines
980 B
JavaScript
34 lines
980 B
JavaScript
/* Cache-first: once installed the clock never touches the network again. */
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const CACHE = "bgclock-v7";
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const FILES = [
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"./",
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"./index.html",
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"./manifest.webmanifest",
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"./icon-192.png",
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"./icon-512.png",
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"./icon-maskable-512.png"
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];
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self.addEventListener("install", (e) => {
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e.waitUntil(caches.open(CACHE).then((c) => c.addAll(FILES)).then(() => self.skipWaiting()));
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});
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self.addEventListener("activate", (e) => {
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e.waitUntil(
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caches.keys()
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.then((keys) => Promise.all(keys.filter((k) => k !== CACHE).map((k) => caches.delete(k))))
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.then(() => self.clients.claim())
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);
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});
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self.addEventListener("fetch", (e) => {
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if (e.request.method !== "GET") return;
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e.respondWith(
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caches.match(e.request).then((hit) => hit || fetch(e.request).then((res) => {
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const copy = res.clone();
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caches.open(CACHE).then((c) => c.put(e.request, copy)).catch(() => {});
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return res;
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}).catch(() => caches.match("./index.html")))
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);
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});
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