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Online Experiments and Keyboard Input: Error sound in some Browsers

Psychopy Version: Standalone 3.1.0.

URL to Experiment: https://pavlovia.org/run/Felix/keyboardtry/html/

Description of the problem: I’ve designed an online-experiment that needs the participant using the keyboard to give responses. It works fine in most browsers. In one browser, every time I press a key during the experiment, the computer produces a sound, namely the “you’re not allowed to perform this action here”-sound (for lack of a better word). Maybe this could be resolved somehow?

My current workaround is to require participants to use a browser in which this does not occur. I remember seeing a list of supported browsers at some point, but can’t manage to find it anymore. Does anyone have the link?

Tested browsers (on MacOS 10.14.3):

Safari 12.0.3: Produces error sound
Firefox 66.0.3 (64bit): works fine
Chrome 73.0.3683.103 (official build) (64bit): works fine

this still occurs in 3.1.2, haven’t figured out how to fix it.

I just tested and I find the same in Safari. Is very strange.

@apitiot any idea what could cause this to happen? Maybe Pixi.js doesn’t consume the key event fully so it gets passed to the browser which then complains?