Reminds me of a fake MacOS website that we naughty students used to load up on IE on Windows machines at school and then full screen it, which would make it look like it was converted to a Mac.

Except it was just a webpage designed to look like a Mac with some very basic GUI features.

It was an extremely popular prank, I just can't remember the name of the website now.

And today we have actual real MacOS in a browser.