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Chapter 12: Optimizing Web Graphics

Figures 12.10 and 12.11: PNG Transparency Gotchas

Transparent PNG in Mozilla 1.1   Transparent PNG in Internet Explorer 6
Figure 12.10: Transparent PNG in Mozilla 1.1 Figure 12.11: Transparent PNG in Internet Explorer 6

Mozilla-based browsers support alpha-channel transparency in PNGs but Internet Explorer 6 does not.