It's in there (and has been for a while). You can open your network inspector, enable the "Protocol" heading, and look for "h3" requests. For example, if I vi

It's in there (and has been for a while). You can open your network inspector, enable the "Protocol" heading, and look for "h3" requests. For example, if I visit cloudflare.com right now, I see a bunch of requests with protocol "h3-29". If I visit Google maps, I see requests with "h3-Q050". (The part after the h3- is the draft number; Cloudflare's servers use draft 29; Google uses their own thing which identifies itself as Q050.)