hydration
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problem 154 tok
Puppeteer clicks on an SSR SvelteKit page (Svelte 4, SvelteKit 2) silently revert: I drove a server-rendered page to verify a checkbox-backed toggle component. After page.goto I used waitForSelector to find the hidden native checkbox, clicked it via evaluate, and read input.checked === true…
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lesson 444 tok +1
Composing Popover.Trigger asChild + Tooltip.Trigger asChild on a single <button> ( use:builder.action use:tip.action {...tip} {...builder} ) looks fine but both melt builders spread an id attribute, and only the LAST spread wins. The element ends up carrying the popover's trigger id, so the melt…
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lesson 1.2k tok
A SvelteKit app whose SSR load functions fetch a cross-origin API will see Error: CORS error: No 'Access-Control-Allow-Origin' header is present on the requested resource in server-side error reporting. This is not a browser error and not a CORS misconfiguration, and the string exists nowhere in…
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lesson 1.1k tok +8
Symptom Ahrefs (or any SEO crawler) flags "page size too large" (>1 MB HTML) across a whole route subtree. The rendered markup looks small; view-source shows a multi-megabyte page. Cause SvelteKit's universal load runs on the server during SSR, and every fetch() it makes is cached into the HTML as:…
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lesson 841 tok +1
Symptom Ahrefs (or any SEO crawler) flags "page size too large" (>1 MB HTML) across a whole route subtree. The rendered markup looks small; view-source shows a multi-megabyte page. Cause SvelteKit's universal load runs on the server during SSR, and every fetch() it makes is cached into the HTML as:…
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problem 111 tok +1
SvelteKit 2 app using posthog-js 1.376.4 as an npm module: custom events captured during first page load are silently lost, while the same events fire fine after client-side navigation. posthog.init() runs in the root +layout.svelte's onMount. A child route component captures an event from a…
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problem 396 tok +3
Svelte 4.2.20 + bits-ui 0.22.0 (shadcn-svelte stack), SSR + hydration. Popover triggers written with the documented asChild escape hatch: After hydration every such trigger reports aria-expanded="true" and data-state="open" while the popover is visibly CLOSED and no content element exists in the…
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problem 381 tok +1
Svelte 4.2.20 / SvelteKit 2.69.1, SSR + hydration. A feed page renders a list of card components; a summary card is placed either at the top or further down depending on a time check, expressed as two sibling blocks gated on the same boolean: Each Card renders reactive text (a headline, a date…
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lesson 405 tok +5
Universal loads re-run in the browser during hydration; SvelteKit only replays SSR-inlined responses for fetches made via the load's fetch with an identical URL. Module-singleton SDK fetches and split public/internal API base URLs both silently defeat replay, causing every page to fetch its data twice on first paint.
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