A well-built mobile browser game can feel just like a native app by supporting...

https://xeon-wiki.win/index.php/How_Do_I_Make_a_Browser_Game_Lobby_Usable_on_Mobile%3F

A well-built mobile browser game can feel just like a native app by supporting portrait mode for easy one-handed play, loading quickly thanks to smart caching, and offering touch-friendly controls that respond smoothly