Google Stadia now supports 4K streaming on the web

Google Stadia now supports 4K streaming on the web. to use this feature requires an "Excellent" internet connection over 100Mbps, you should then be able to stream 4K games from Stadia

Google Stadia now supports 4K streaming on the web- Google's Stadia Cloud Gaming Service is now starts rolling out 4K streaming support for Stadia on the web.
As reported by the 9to5Google,
Some of the Reddit users have spotted this new 4K support option in games like Assassin’s Creed Odyssey, Attack on Titan: Final Battle 2, Mortal Kombat 11, and Grid. 
Stadia users are now reporting that they are able to stream and play selected games in 4K in Chrome on their PC. 
Up until now, 4K gaming on Stadia was limited to users having a Chromecast Ultra.
Meanwhile, to use this feature requires an "Excellent" internet connection over 100Mbps, you should then be able to stream 4K games from Stadia without any troubleshoot and the improvement in quality should be easily noticeable. 
You can also verify whether you are playing games in 4K on Stadia on the web or not simply by pressing the Stadia button on the controller or pressing Shift + Tab and then click on "Connection." button, You should see a "4K" icon under the "Data Usage" status. 
So far, that preference along with HDR -can only be set on the mobile apps and not stadia.com.
Moreover, To check if Stadia already supports 4K on your browser, make sure you've activated "best visual quality" in your account's Data usage & performance settings, accessible via your avatar in the top right corner of the streaming service's app. Then, start a game and see if you have a green 4K badge in your connection stats, as shown below.

So far, Google hasn't officially announced the rollout of this new 4k streaming feature, but with the first users enjoying the high-resolution games, it might not be long until it does. 
Back in January, the company also promised that it would soon additionally introduce wireless gameplay on the web through the Stadia controller, so hopefully, this is the next item on its to-do list.
Also, starting this week Stadia Games and Entertainment announces a new studio headed by God of War producer, driving Google’s ambitions for Stadia exclusive games and especially first-party titles.