Steam Deck Controller Mapping for Phaser 3

Ensure every generated game works with Steam Deck controls out of the box. The Steam Deck exposes its controller as a standard XInput (Xbox-layout) gamepad via the W3C Gamepad API in browsers.

Steam Deck Physical Layout

         [L1/LB]   [R1/RB]          Buttons 4, 5
         [L2/LT]   [R2/RT]          Buttons 6, 7 (analog 0.0-1.0)

[L4] [L5]                   [R4] [R5]   (back grip buttons, NOT in standard mapping)