???????????????д????飬???????????????о?????顣
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????????????????????????????У???????????????????
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????????Firefox??????????????????????粻??μ???????????????
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????IE8?????????????????????????????????????IE8??
????Firefox???????????????о??????
????Chrome????????
????Safari????????????????У?Safari????????嵽?????????壬????д????????????
????????????????

???????????????????δ????ClearType??????μ?????
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????????????з???IE8??????棩??????????????????????????BUG??????30?????????????????IE8??????????????1??2??????