div, span, img aren't actually HTML, rather a set of components that bind to DOM elements. At its core RNWeb is just a set of primitives that bind components like View, Image, or Text to DOM elements like div, img, and span. These primitives provide the foundation for creating universal applications. expo build:web) you are creating a static react website that can be hosted anywhere. Generally because you made a universal application, your final product will come out feeling more like a web app then a traditional website. This is because you'll more than likely be using complex native APIs like Camera, ImagePicker, Gesture Handler, or MapView in the browser.