This "much like alpha in PNGs" makes it sound like you think this is a recent problem we still have to deal with. It's not: http://caniuse.com/#feat=png-alpha

This "much like alpha in PNGs" makes it sound like you think this is a recent problem we still have to deal with. It's not: http://caniuse.com/#feat=png-alpha http://caniuse.com/#feat=png-alpha PNG alpha transparency was a problem with the decade old IE6. And even then IE6 worked fine with PNG8 images that had alpha transparency. IE7 and IE8 required a 1 line style attribute to work 100% with PNG + alpha, and IE9 did away with that need altogether.