the prefixes don't really mean much nowadays. Most browsers will support all other browser prefixes. There are simply CSS problems that haven't been solved by t

the prefixes don't really mean much nowadays. Most browsers will support all other browser prefixes. There are simply CSS problems that haven't been solved by the CSS standard itself. Sometimes different browsers come up with their own solution that is not in the standard (though this rarely happens anymore). In order to prevent "this website looks weird on <SOME_BROWSER>", SOME_BROWSER needs to implement support for it. There are very few prefixed CSS properties that aren't supported by all browsers nowadays. Think of them as stopgap solutions until the actual CSS standard catches up