A mobile browser game can feel native by offering portrait support that fits...

https://garrettsinsightfulchat.wordcanopy.com/posts/how-do-i-handle-a-wide-range-of-phone-hardware-for-browser-games

A mobile browser game can feel native by offering portrait support that fits your screen perfectly, making it easy to play with one hand. It loads quickly thanks to smart caching, so you spend less time waiting