Test your keyboard

• Keys are captured only while the test zone is focused; click into it first. The page never installs a global key logger, and nothing is stored: leaving the zone or the page ends the test.
• The simultaneous-key count is an observation about this browser, OS, and page right now; NOT the keyboard's rollover spec. OS shortcuts (Cmd+Tab, Alt+Tab) are consumed by the OS and never reach the page.
• Dead keys and IME composition surface as key values like Dead or Process; shown as the browser reports them, not resolved to characters.
• keyCode is legacy: its values differ across engines for the same key. It is shown for comparison with old tables, never as the truth; key and code are.
• Auto-repeat events update the "held right now" line without spamming the table. A held key is one row plus a live state, not forty rows.

Peak simultaneous non-modifier keys: 0

lifetime peak this session: 0

The simultaneous-key count is an observation about this browser, OS, and page right now; NOT the keyboard's rollover spec. OS shortcuts (Cmd+Tab, Alt+Tab) are consumed by the OS and never reach the page.