This is one of my favorite pieces of software. Plash - put a webpage on your #Mac desktop. I use it to display my #PiAware map.
https://github.com/sindresorhus/Plash
GitHub - sindresorhus/Plash: 💦 Make any website your Mac desktop wallpaper
💦 Make any website your Mac desktop wallpaper. Contribute to sindresorhus/Plash development by creating an account on GitHub.
Old Man in the Shoe