keep your styles clean You hate writing vendor prefixes for all browsers? Just let CSSPrefixer do it for you! See it in action: .my-class, #my-id { border-radius: 1em; transition: all 1s ease; box-shadow: #123456 0 0 10px; } Installation easy_install cssutils (or pip install cssutils if you have pip) Usage: From console cssprefixer my1.css my2.css --minify > result.css From Python import cssprefix