Since its arrival, browser support for CSS3 has been variable, making feature detection not just a good idea but best practice. Although this detection is usually done with JavaScript, ideally it would be done within CSS which is where @supports comes in. CSS @supports allows us to have simpler and cleaner feature detection that doesn't rely on other technologies, and works even if JavaScript is disabled. Browser support ... Unfortunately as with so many cool technologies, there is the issue of browser...