Is There a Way to Fake My Presence in an Online Class?

One option is to run your class in a virtual machine or on another computer. Alternatively, you could just focus on the class itself. It might be better to tackle the main issue instead of finding workarounds.

It sounds like the site has an onblur event to track your window changes. You could try inspecting the page's network requests to see what's sent when you switch windows. If there's a way to block that request without affecting other functionalities, that could work. Otherwise, using a separate device like your phone for other tasks could be simpler.

If you're familiar with developer tools in your browser, you might try using the focus flag on an element on the page. There are tons of tutorials that can guide you on how to manipulate those tools.

Honestly, it might just be best to attend your online class as intended. Skipping out on class isn't a good habit!