How Hidden Browser Tabs Caused an AI QA Agent to Falsely Pass Blank Canvas Tests

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A developer using an AI-powered QA agent built on Claude and Chrome MCP discovered that the tool was falsely approving broken features, including a completely blank canvas, by marking them as fully functional. The root cause was browser throttling in hidden background tabs, where Chrome aggressively limits requestAnimationFrame to save power, resulting in zero rendered frames despite clean JavaScript execution. Measurements confirmed that rAF fired zero times in hidden tabs, while setInterval ran at roughly one-eighth its expected rate and setTimeout drifted significantly. The developer found that AI agents were evaluating code-path health — such as event wiring and absence of JS errors — rather than actual visual or behavioral output. The fix involved opening tabs in a visible state before screenshotting, requiring explicit behavior verification for any dynamically rendered features, and mandating that unverified dynamic features never be silently graded as passing.

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