Detection approach
Default automation viewport size detected (exactly 800x600 for Puppeteer or 1280x720 for Playwright). Real humans browse with customized device screen resolutions and browser chrome, never with these hardcoded driver defaults.
How this helps detect bots
Collect this signal alongside session context, request metadata, and other independent indicators. A single anomaly is a lead, not a verdict; corroborating anomalies make automated traffic more likely.
Legitimate traffic to consider
Legitimate users resizing window viewport sizes to exactly 800x600 or 1280x720.
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