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It's not just an issue of displaying the .png, but how it affects other elements around it.
For example, IE 6 has a bug that prevents hyperlinks being clicked if they are laid over a transparent png background, requiring sophisticated scripting to swap a gif placeholder and use z-order stacking.
Folks with fancy backgrounds that didn't bother to do real-world cross-browser testing may have missed the fact that a major market segment couldn't click their site's links...
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