On my project I came up with a solution where, on client side, a tiny piece of script sends browser width via push a push event whenever the browser is resized.
Then, server-side, I have a custom render function which will render different versions of the template regarding the current width (for instance it will render index.desktop.html.leex or index.mobile.html.leex)
Let me know if you’re interested, I can post some gist
