This &quot;much like alpha in PNGs&quot; makes it sound like you think this is a recent problem we still have to deal with. It&#x27;s not:<p><a href="http:&#x2F;&#x2F;caniuse.com&#x2F;#feat=png-alpha" rel="nofollow">http:&#x2F;&#x2F;caniuse.com&#x2F;#feat=png-alpha</a><p>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.