GitHub - kallaspriit/HTML5-JavaScript-Gamepad-Controller-Library: Library for accessing gamepads in modern browsers.
HTML5test - How well does your browser support HTML5?
Gamepad tester || Check every button on your Controller works perfectly or not || Joysticks Tester - YouTube
Get Pumped for the HTML 5 Gamepad API
HTML5 Gamepad Tester - Test your gamepad online! — Steemit
HTML5 Gamepad Detector
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 :
Using the HTML5 Gamepad API to Add Controller Support to Browser Games