I have my own SCSS file to handle vendor prefixes. It’s painful to keep updated and requires some serious hunting to get all the nitty-gritty details for each property. I have to dig through caniuse, css3please, MDN, webplatform.org, and a few others. Yes, I could use Autoprefixer, -prefix-free, Compass, or any number of other solutions. I would rather not because I like knowing all the nitty-gritty little things going on with my code and which browsers I’m supporting.