Detection approach
Window geometry mismatch: outerWidth minus innerWidth is exactly 0, indicating a headless browser window lacking physical frame/chrome (toolbar, address bar, scrollbar margins).
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 running custom borderless screen extensions or custom browser configurations.
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