A good mobile browser game feels native because it’s designed to work smoothly...

https://smart-wiki.win/index.php/How_Do_I_Make_an_HTML5_Game_Feel_Like_a_Native_App_on_iPhone%3F

A good mobile browser game feels native because it’s designed to work smoothly on your phone’s screen, often supporting portrait mode for easy one-handed play. It loads quickly, using caching to reduce wait times