← Device Access
Keyboard Lock
Probing…Keyboard Lock is a web platform capability in the Device Access category. Capture system keys (Esc, Alt-Tab) in fullscreen. Supported in Chromium 68+; not available in Firefox and Safari. Requires a secure context (HTTPS or localhost) and a user gesture such as a click or tap.
Secure contextUser gesture
Try it
Loading demo…
Code
await el.requestFullscreen()
await navigator.keyboard.lock(['Escape', 'Tab'])
// System shortcuts (Esc, Alt-Tab) now reach your keydown handler
document.addEventListener('keydown', (e) => console.log(e.code))
navigator.keyboard.unlock()
await document.exitFullscreen()Browser support
Chromium
68
Firefox
No
Safari
No
Frequently asked questions
Which browsers support Keyboard Lock?
Supported in Chromium 68+; not available in Firefox and Safari.
Does Keyboard Lock require HTTPS?
Yes. Keyboard Lock needs a secure context, so it only works over HTTPS (or on localhost during development).
What is Keyboard Lock used for?
Capture system keys (Esc, Alt-Tab) in fullscreen.
Can I try Keyboard Lock in my browser?
Yes. shwcs.net runs a live Keyboard Lock demo that probes your current browser and lets you try the API. Everything runs locally — nothing is sent anywhere.