Onscreen keyboards - Selection and input - Components - Human Interface Guidelines - Design - Apple Developer
Amazon.com: Punkston TH61 60% Mechanical Gaming Keyboard,RGB Backlit Wired Ultra-Compact Mini Mechanical Keyboard Full Keys Programmable White (Optical Blue Switch) : Video Games
How to Set a Backlit Keyboard to Always On
Logitech POP Keys Wireless Mechanical Emoji Keyboard