If you want to just change the styling and layout of the page depending on the user's device, then you can use css's media queries[0]. But if you want to serve

If you want to just change the styling and layout of the page depending on the user's device, then you can use css's media queries[0]. But if you want to serve two totally different pages (one for mobile and another for desktop), then I don't see how it can be done without JS or reading the user agent. [0] : https://developer.mozilla.org/en-US/docs/Web/CSS/Media_Queries/Using_media_queries https://developer.mozilla.org/en-US/docs/Web/CSS/Media_Queri...