This is SQLite compiled to WebAssembly along with a storage layer ("virtual filesystem") that fetches database pages from a web server. So you have the full po

This is SQLite compiled to WebAssembly along with a storage layer ("virtual filesystem") that fetches database pages from a web server. So you have the full power of SQLite, and the page doesn't have to download unnecessary data from the server (like the entire dataset just to show you one row). It's a super nifty hack. SQLite built into the browser is somewhat orthogonal to this concern; it didn't allow you to store database pages on the server, and this one doesn't let you write to it.