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IE6 and below had no end of trouble with PNG transparency. IIRC it only supported transparency correctly on PNG8 images but only in img tags, not backgrounds, a
by giantrobot 5y ago
IE6 and below had no end of trouble with PNG transparency. IIRC it only supported transparency correctly on PNG8 images but only in img tags, not backgrounds, and ignored the alpha channel entirely on PNG32.
There were some IE-specific hacks you could use with their proprietary CSS extensions but they were really annoying. I think IE7 finally fixed the transparency bugs but since there was still a huge IE6 cohort it was still a crapshoot relying on transparent PNGs.