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It works perfectly in Safari on mobile. this never happens.

My phone IMMEDIATELY got toasty as I started moving around the world :')

Never tried Doom on a phone before, this one is surprisingly fluid and very playable.

Works smoothly in Firefox. But the default key mapping is busted: fire at Alt means that it opens and closes the menu in Firefox with each press. Also, Alt + left arrow ends the game and goes back in history.

Interestingly, it was more choppy in Chromium.

I could not find a key for moving sideways ("strafing").

All in all, quite mind-boggling.

Strafing is implemented on A and D at least, but having one hand on the arrows to turn and WASD to move is a bizarre mix of modern and original controls

> Interestingly, it was more choppy in Chromium.

Firefox's WebRender is truly a great creation. While Chrome is faster at most things especially involving JS, Firefox puts so much of its rendering on the GPU so moving elements around is incredibly fast.

There are some new key-trap ApIs that can handle that, IIRC FF don't handle that part as well as Chrome.