Web app unable to capture input focus once lost

[helpcomputer]

If you play a Pyxel web game and click outside the window you're unable to recapture input focus of the app.

I tried it with the the below games, same behaviour for both, in Chrome and Firefox:

https://fbrzd.itch.io/tiny-tale
https://helpcomputer.itch.io/vortexion

It seems fine when the game launches in full screen, for example in the case of the below game, you can click outside the game but can regain input capture:

https://aged99oow.github.io/mario/