完美的解决IE6下fixed定位抖动问题
body{_position:absolute; _top:expression(offsetParent.scrollTop);}#sidenav { width: 300px; position: fixed; /*--Fix the sidenav to stay in one spot--*/ float: left; /*--Keeps sidenav into place when Fixed positioning fails--*/ _position:absolute; _top:expression(offsetParent.scrollTop)}
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