Available screen area exceeds the physical screen (impossible geometry)
br.screen_impossible · convicts
browserlayer
artifactcategory
1evaders caught
What it catches
CreepJS / bot.sannysoft.com: screen.availWidth/Height can never exceed screen.width/height on a real device; avail > total is a spoofed/sloppily-randomised screen lie (both logical px, no zoom/dpr confound)
Signals it reads
browser.screen_impossible
How it fires
present
Evaders it caught 1
Bypassed by 10
Frontier evaders that reach the detector uncaught (scored only suspicious, defeating every convicting tell) — this check is not one that stops them. The red-team frontier this detection still has to convict.