Xbox Game Controller Tester Guide - You might not suck at NHL!
How to Make an Online Test for Gamepad Controller Using HTML5 Gamepad API - DEV Community
How to test a game controller input on Windows 10
Best Response within: Xbox One Controller on Ubuntu - Stadia Community
Jumping the hurdles with the Gamepad API
GitHub - greggman/html5-gamepad-test
How to Calibrate Your PS or Xbox Controller in Windows 10
Gamepad tester || Check every button on your Controller works perfectly or not || Joysticks Tester - YouTube
Gamepad API and Xbox Controller on Mac
Beginner-professional controller recommendation
Hello r/gamedev, I made this free little tool to test out controller inputs, since there's hardly a way to test them out without running a game or some other unrelated software :
How to use JS Gamepad API and Build a Gamepad Tester : r/WebdevTutorials
Gamepad Test | Controller & Joystick Test with Gamepad Viewer
Gamepad in html5 (DEF-3931) (SOLVED) - Questions - Defold game engine forum