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Although we can defined $('ul').superfish({ speed: 0 }); to make it feels like it has no opacity animation, there is still opacity animation (it's just become very fast so you don't notice). Therefore in IE7/8 the font smoothing issue occurs. In IE7, font loose ClearType completely; in IE8, font loose ClearType during the animation. Take a look at the official demo on IE7/8.
How can we disable opacity animation for IE7/8?
How can we disable opacity animation for IE7/8?
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