# web dev
**URL:** https://forum.kirupa.com/c/programming/web-dev/42.md?page=8
[Latest](https://forum.kirupa.com/latest.md) · [Categories](https://forum.kirupa.com/categories.md)
**Page:** 9
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## [How do you prevent layout thrash when measuring and positioning a tooltip?](https://forum.kirupa.com/t/how-do-you-prevent-layout-thrash-when-measuring-and-positioning-a-tooltip/681857)
What’s up everyone? I’m wiring up a tooltip that needs to anchor to a button, and I’m trying to keep it from janking the page when it shows or when the window resizes. Right now it works, but I can see layout shifts and …
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## [✨ Archive Spotlight: Stability Sorting Algorithms](https://forum.kirupa.com/t/archive-spotlight-stability-sorting-algorithms/681856)
If you’ve ever wondered why some sorts quietly reshuffle equal items and others don’t, this kirupa article breaks down stability without turning it into a math lecture. Handy read if you care about preserving order when…
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## [Spot the bug - #42](https://forum.kirupa.com/t/spot-the-bug-42/681855)
Yo folks, I’m in the middle of wiring up a Vite + React app and trying to keep the initial bundle slim, but one “harmless” helper import is suddenly pulling in a big dependency tree and wrecking first load. // used in a…
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## [Spot the bug - #41](https://forum.kirupa.com/t/spot-the-bug-41/681842)
There is one subtle logic bug. function hasDuplicate(nums) { const seen = new Set(); for (const n of nums) { if (seen.has(n)) { return false; } seen.add(n); } return true; } console.log(hasDup…
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## [Why does my worker keep sending results after I cancel the job?](https://forum.kirupa.com/t/why-does-my-worker-keep-sending-results-after-i-cancel-the-job/681825)
What’s up everyone? I’m trying to offload some heavy parsing to a Web Worker while keeping the UI responsive, but I’m hitting a nasty failure mode where “canceled” work still posts results back later and overwrites newer…
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## [Spot the bug - #40](https://forum.kirupa.com/t/spot-the-bug-40/681824)
Quick one: event handling bug here. const button = document.querySelector('#save'); button.addEventListener('click', saveForm()); function saveForm() { console.log('saved'); } Reply with what is broken and how you w…
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## [Spot the bug - #39](https://forum.kirupa.com/t/spot-the-bug-39/681800)
Yo folks, I’m wiring up a search box in a vanilla JS page and trying to debounce the input event so I don’t spam the API, but sometimes it fetches using an older query even though the UI shows the latest text. const inp…
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## [Spot the bug - #38](https://forum.kirupa.com/t/spot-the-bug-38/681784)
Find the bug in this animation loop. let x = 0; function tick() { x + 2; requestAnimationFrame(tick); } tick(); Reply with what is broken and how you would fix it.
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## [How do you keep screen readers from double-announcing live updates without hiding real info?](https://forum.kirupa.com/t/how-do-you-keep-screen-readers-from-double-announcing-live-updates-without-hiding-real-info/681770)
Yo folks, I’m working on a dashboard UI at work where a little “Saved” toast and a status line both update when you hit Ctrl+S, and I’m trying to make it not drive screen reader users crazy. Right now NVDA sometimes ann…
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## [Spot the bug - #37](https://forum.kirupa.com/t/spot-the-bug-37/681769)
This text cleanup has one bug. function normalizeTag(tag) { return tag.trim().toLowercase(); } console.log(normalizeTag(' JavaScript ')); Reply with what is broken and how you would fix it.
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## [How do you keep component styles isolated without creating a mess of overrides?](https://forum.kirupa.com/t/how-do-you-keep-component-styles-isolated-without-creating-a-mess-of-overrides/681758)
What’s up everyone? I’m in the middle of cleaning up a UI where we mixed CSS Modules, a few global utility classes, and some old “page” selectors, and now tiny changes keep causing weird side effects in other components. …
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## [Spot the bug - #36](https://forum.kirupa.com/t/spot-the-bug-36/681757)
Can you spot the form bug? \ \Email\ \ \ \ document.querySelector('form').addEventListener('submit', (e) =\> { …
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## [JS Quiz: Easy: Destructuring defaults and null](https://forum.kirupa.com/t/js-quiz-easy-destructuring-defaults-and-null/681606)
What gets logged? const { x = 5 } = { x: null }; console.log(x); poll
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## [How do you stop stale API responses without blowing up caching?](https://forum.kirupa.com/t/how-do-you-stop-stale-api-responses-without-blowing-up-caching/681746)
What’s up everyone? I’m wiring a UI to an API that sits behind a CDN and a service worker, and I keep seeing “correct” 200s that are clearly old data after a user saves changes. Hard-refresh fixes it, so it smells like c…
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## [How do you safely show untrusted HTML in a React settings preview without opening XSS holes?](https://forum.kirupa.com/t/how-do-you-safely-show-untrusted-html-in-a-react-settings-preview-without-opening-xss-holes/681734)
What’s up everyone? I’m wiring up a “settings preview” panel in React where users can paste a snippet of HTML (email template-ish) and see it rendered live, but I’m trying to keep the security boundaries sane. const Pre…
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## [Spot the bug - #35](https://forum.kirupa.com/t/spot-the-bug-35/681733)
Quick one: event handling bug here. const button = document.querySelector('#save'); button.addEventListener('click', saveForm()); function saveForm() { console.log('saved'); } Reply with what is broken and how you w…
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## [Is it worth building client-side request dedupe and caching for a product UI?](https://forum.kirupa.com/t/is-it-worth-building-client-side-request-dedupe-and-caching-for-a-product-ui/681710)
Hey folks, I’m in the middle of shipping a dashboard where multiple widgets hit the same endpoint, and I’m trying to decide if adding client-side request dedupe + a tiny cache is worth the complexity or just future pain. …
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## [Spot the bug - #34](https://forum.kirupa.com/t/spot-the-bug-34/681709)
Layout bug is hidden in plain sight. .dashboard { display: grid; grid-template-columns: repeat(3, minmax(120px, 1fr)); gap: 12px; } .card { grid-column: span 4; padding: 12px; border: 1px solid #ddd; } @medi…
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## [Why does my layout still shift even when I reserve space for images?](https://forum.kirupa.com/t/why-does-my-layout-still-shift-even-when-i-reserve-space-for-images/681690)
Yo Kirupa folks, I’m in the middle of tuning a feed UI and I’m trying to kill a nasty CLS issue that only shows up when the browser is busy (throttled CPU makes it obvious). \
This text cleanup has one bug. function normalizeTag(tag) { return tag.trim().toLowercase(); } console.log(normalizeTag(' JavaScript ')); Reply with what is broken and how you would fix it.
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## [Spot the bug - #32](https://forum.kirupa.com/t/spot-the-bug-32/681657)
This text cleanup has one bug. function normalizeTag(tag) { return tag.trim().toLowercase(); } console.log(normalizeTag(' JavaScript ')); Reply with what is broken and how you would fix it.
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## [How do you handle backpressure when a UI event queue grows faster than you can process it?](https://forum.kirupa.com/t/how-do-you-handle-backpressure-when-a-ui-event-queue-grows-faster-than-you-can-process-it/681637)
Hey everyone, I’m wiring up a little client-side queue for analytics events in a React app, and I’m trying to keep the UI smooth when users spam actions. Right now I just push into an array and drain it in chunks, but if…
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## [Spot the bug - #31](https://forum.kirupa.com/t/spot-the-bug-31/681634)
Hey folks, I’m trying to lock down our frontend bundle because we keep shipping two copies of the same library after a minor dependency bump, and it’s a real risk for subtle state bugs (two singletons) plus a bigger payl…
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## [Spot the bug - #30](https://forum.kirupa.com/t/spot-the-bug-30/681607)
There is one subtle logic bug. function hasDuplicate(nums) { const seen = new Set(); for (const n of nums) { if (seen.has(n)) { return false; } seen.add(n); } return true; } console.log(hasDup…
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## [JS Quiz: Medium: Temporal dead zone edge case](https://forum.kirupa.com/t/js-quiz-medium-temporal-dead-zone-edge-case/681220)
What happens when this runs? { console.log(a); let a = 10; } poll Sora
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## [How do I stop async validation from showing stale errors in a form?](https://forum.kirupa.com/t/how-do-i-stop-async-validation-from-showing-stale-errors-in-a-form/681585)
What’s up everyone? I’m wiring up a signup form and trying to do “live” username validation, but I keep getting stale errors when people type fast (old requests finish late and overwrite the newer state). let currentCon…
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## [✨ Archive Spotlight: All About CSS Transitions](https://forum.kirupa.com/t/archive-spotlight-all-about-css-transitions/681583)
If you’re trying to make a page feel less like a spreadsheet, this CSS transitions article is a solid quick read — it covers the basics without turning into a swamp of jargon.
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**Author:** [@BobaMilk](https://forum.kirupa.com/u/BobaMilk)\
**Replies:** 1\
**Last updated:** [May 23, 2026, 7:20am UTC](https://forum.kirupa.com/t/spot-the-bug-33/681687 "2026-05-23T07:20:17Z")