With 12GB it's a seriously cool offering. I actually know 8GB works as well, and I've seen people on MacBook Airs with 50 tabs open, full IDE's and breezing. But I still would want at least 4GB more to be on the safe side.
Well, you'll be fine on pretty much all websites out there with 8GB, and virtual memory helps you with multiple apps, dozens of tabs. They don't all need to be in memory at once. Apple Silicon helps move that data around very fast.