A key concern when designing web content is browser support—which browsers do we support? If the only browsers we had to support were the likes of Firefox or Chrome, then our job would be easy. Trouble is, we also have IE, Safari, Edge…not to mention mobile devices! Life would be boring otherwise…

But I digress, back to reality: for those legacy browsers that refuse to conform (yes, I'm looking at you in particular, IE), we have to consider providing some form of support or graceful degradation. Thankfully, there are a number of plugins we can use within the PostCSS ecosystem—we've already used one in the form of Autoprefixer; there are others available, so let's dive in and take a look at a selection of these plugins in more detail. Before we do so, though, there is a useful tip that I want to explore, which can help with checking for, and providing, legacy support in our browsers.