Keyboard Test
This page is designed for laptop checks and external keyboard testing. Each pressed key stays highlighted so you can work through the layout once and confirm the whole keyboard.
Why some keys may not register in a browser
System-reserved keys such as function keys, Mission Control shortcuts and the Fn key are often intercepted by macOS, Windows or the browser before a webpage can see them.
That limitation is normal for web-based keyboard tests. Standard letter, number and modifier keys are usually reliable, while certain special keys depend on system settings.