A mobile browser game can feel native because it adjusts smoothly to portrait...

https://andressuniquechat.cloudhinter.com/posts/my-page-jumps-around-while-loading-assets-how-do-i-stop-that

A mobile browser game can feel native because it adjusts smoothly to portrait mode, making it easy to play on your phone. It loads quickly, even on slow connections, thanks to smart caching