Bug 218055

This API allows applications to determine which keycodes are mapped to specific keyboard keys on non-QWERTY keyboard layouts. For example, in a FPS game, the player will navigate using the WASD keys on a QWERTY keyboard, but ",AOE" on a Dvorak keyboard.

Providing this information allows a web application to show an appropriate keyboard hint (e.g., "press the [,] key to move forward") for the current keyboard layout.

Spec: https://wicg.github.io/keyboard-map/.

There are fingerprinting considerations here, as noted in https://wicg.github.io/keyboard-map/#privacy. Given that the mapping between a key and its keycode is shared with the web application whenever a key is pressed (allowing fairly identification of layout with only a couple keys), requiring a user gesture may be sufficient protection.