The Gamepad API Lies to You: A Practical Guide to Reading Controller Input in JavaScript
SMRTR summary
The Gamepad API looks simple until you test a broken controller and it reports zeros. Chromium's sanitization rule masks axis values until the browser sees them near zero first, meaning a badly drifting stick may never unmask itself. Detecting real drift requires two gates: low mean magnitude and high directional coherence, not just a timer threshold.
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