Dev html export not working

[Skeptim]

Building the current dev version, the html export doesn't work well.
When I launch the game it works but if I click somewhere else and then I click back on the game it does not work any more.
Also, when the game works there are lines on top and bottom (and not when we click somewhere else).

You can test here: https://skeptim.itch.io/test?secret=qTgF4JuT8Y6AjQ5Jjnd4Htm5PE

Note: Others on discord had similar issues. I tried to reproduce theirs to open this github issue but what I get isn't exactly the same.

[AlecTroemel]

Interestingly, after clicking outside the game window you can get focus back on the game by hitting tab a couple times.

Without knowing how the web build really works, it seems like the canvas is missing an onClick event?

[AlecTroemel]

Looking at older builds, we could be missing a onmousedown="window.focus()" on the canvas element