I'm uploading this as a quick and simple joystick tester, largely to have something to point to when discussing issues with HTML5 joystick support. It just visualises the control state for all 8 possible players.

Nettie's joystick test

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Nettie's joystick test

by weeble

Cart #netties_joy_test-1 | 2021-01-26 | Code ▽ | Embed ▽ | License: CC4-BY-NC-SA

4

Nettie's joystick test (+ extended menu callback test)

by rnd

Cart #nupeziwozo-0 | 2021-02-17 | Code ▽ | Embed ▽ | License: CC4-BY-NC-SA

3

I made a version with that custom menu that PICO-8 0.2.2 has to demonstrate another bug:

If a menu item reacts to the left and right button presses, then whenever you quit it, the first left or right press will "leak" to the game.