I took a peek at the terms of service[1] when considering signing up for an account. It seemed unusual to have them in a separate language from the rest of the site.

Presuming the translation was correct I would "agree to comply with Chinese laws ... [and] grant the company a non-exclusive, free, perpetual license for global use (including modification, display, and derivative development)."

[1] https://staying.fun/en/legal/terms-of-service

This is really great!

Is there a way to run it locally? Maybe with docker?

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If there is any way to make a small donation, buy you a coffee, I would.

Hey, some feedback on those 1/24 holes that fill through scrolling. They're not matched with the steps of the scrollwheel. It seems like a step fills 1.2 holes. It pauses the animation of your demonstration between your points. Checked both Chromium and Firefox. Also checked my mouse events, and a single step matches with a single event.

This is a great learning tool!

One small improvement, show the return values, not just the result, and somehow visualize if the function has not yet returned.

Maybe it's just because I'm used to debuggeres, but the vertical arrangement of variables and their values seems weird.