About Keyboard Test
A keyboard test shows whether each key on a keyboard sends a signal to the computer. Press a key and the page displays its key value and its physical code, such as KeyA or ShiftLeft, and adds the code to a list. Keys stay highlighted while held down, which lets you check several keys together. The browser cannot see every key: the Fn key and some media or system keys never reach a web page.
Questions about Keyboard Test
Why does the Fn key not show up?
On most laptops the Fn key is handled inside the keyboard itself and is never sent to the operating system, so no web page can detect it. You can still test it indirectly by pressing Fn together with a function key.
How do I test for key ghosting?
Hold down several keys at once and watch the list. Every held key should stay highlighted. If one fails to light up while others are held, your keyboard cannot register that combination, which is a rollover limit of the hardware.
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