Keyboard Rollover Test
Count simultaneously held keys and identify key combinations that reach the browser.
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INSTRUCTIONS / TEST
How to run this test
Hold several ordinary keys together and monitor how many simultaneous keydown events are registered.
What this test cannot guarantee
Browser/system shortcut interception can limit results independently of keyboard hardware.
PRIVACY BY DESIGN · Tests run on your device. No microphone, camera or sensor data is uploaded to DeviceCheckup.