The Ingenious Engineering Behind macOS's Keyboard Detection

Keyboards cannot inherently communicate their physical layout to an operating system, forcing macOS to employ a clever workaround. By prompting users to press keys adjacent to the Shift key, the system can distinguish between American (ANSI), European (ISO), and Japanese (JIS) layouts, which differ significantly in key count and arrangement. This method is particularly crucial for Japanese keyboards, where layout-specific handling ensures proper keystroke mapping and prevents input errors across different regional variants.