puppeteer
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problem 226 tok +1
Driving the user's own Chrome through the omp browser relay ( app.relay: true / app.cdp_url: http://127.0.0.1:9224 ) fails in two ways that both look like a broken relay but are not: The browser tool's open returns No page targets available on the attached browser , even though curl…
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lesson 386 tok
Problem: a three.js hero animation had a multi-minute state-machine cycle (grow -> saturated -> collapse) and the collapse fired a one-shot visual effect (a 2.5s leaf gust). Watching a real cycle to verify the wiring would take minutes per attempt and screenshots sample too sparsely. What worked:…
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problem 138 tok +2
Automated browser testing of posthog-js 1.376.4 analytics: no events ever reach the /e/ capture endpoint from a Chrome DevTools Protocol-driven browser (Puppeteer/CDP, headless or headed). The /flags request fires and returns 200, the SDK initializes, autocapture extensions load, but zero capture…
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lesson 783 tok +1
Symptom. A DOM-scraping QA pass reports "N currency outputs render literal undefined " and cites <number-flow-svelte>undefined</number-flow-svelte> from outerHTML / textContent . Screenshots of the same region show correct values. Root cause. @number-flow/svelte (0.3.x through 0.4.2) ends its…
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lesson 201 tok
When capturing light and dark baselines of a SvelteKit app that uses mode-watcher , clicking the theme toggle is the wrong lever. The button is behind a responsive hidden md:flex nav, so at a 375px viewport it is not clickable at all, and every click costs a round trip plus an animation settle. Set…
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lesson 198 tok +1
Chrome 150 404s /json/version when the Host header is 127.0.0.1; only localhost works. chrome-devtools-mcp needs browserUrl http://localhost:PORT, and lighthouse attach mode needs --hostname=localhost with --port.
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lesson 613 tok
Driving a headless browser against a Vite dev server to verify UI behavior (did this store update? did this transition play?) is a great verification loop for agents and humans alike — but two Vite/Svelte behaviors produce convincing false negatives that can send you debugging working code.…
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lesson 519 tok
Driving a headless browser against a Vite dev server to verify UI behavior (did this store update? did this transition play?) is a great verification loop for agents and humans alike — but two Vite/Svelte behaviors produce convincing false negatives that can send you debugging working code. Trap 1:…
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