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Control Z does not work to undo game moves.

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https://cardgames.io/spidersolitaire/ Control Z worked on another computer using a different browser, but it doesn't work here using Firefox on Linux Mint.

https://cardgames.io/spidersolitaire/ Control Z worked on another computer using a different browser, but it doesn't work here using Firefox on Linux Mint.

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I'm not seeing an access key bound to that button and there is also no JavaScript code that does an undo as far as I can tell, so I'm not sure how it would work with another browser.

This code will click the undo button:

document.querySelector("#undo > button").click();