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除了 IE8 及以下版本,PNG 似乎在所有浏览器中都能正常显示。任何想法为什么会这样?
IE8 及以下不直接支持 PNG 透明度。
但是,这里有一个适用于 IE7 和 IE8 的解决方法:
https://stackoverflow.com/a/3999844/141172