IE局部滚动条中元素position:relative或绝对定位滚动无效BUG

使用的样式与结构如下
.box{width:300px;height:200px;overflow-x:hidden;overflow-y:auto;}
.box ul li{text-align:left;position:relative;line-height:1.3em;}
.box ul li span{position:absolute;right:5px;top:0;}
<div class="box">
    <ul>
    <li><a href="#">标题一</a><span class="time">2010-04-23</span></li>
    <li><a href="#">标题一</a><span class="time">2010-04-23</span></li>
    <li><a href="#">标题一</a><span class="time">2010-04-23</span></li>
    <li><a href="#">标题一</a><span class="time">2010-04-23</span></li>
    <li><a href="#">标题一</a><span class="time">2010-04-23</span></li>
    <li><a href="#">标题一</a><span class="time">2010-04-23</span></li>
    <li><a href="#">标题一</a><span class="time">2010-04-23</span></li>
    <li><a href="#">标题一</a><span class="time">2010-04-23</span></li>
    <li><a href="#">标题一</a><span class="time">2010-04-23</span></li>
    <li><a href="#">标题一</a><span class="time">2010-04-23</span></li>
    <li><a href="#">标题一</a><span class="time">2010-04-23</span></li>
    <li><a href="#">标题一</a><span class="time">2010-04-23</span></li>
    <li><a href="#">标题一</a><span class="time">2010-04-23</span></li>
    <li><a href="#">标题一</a><span class="time">2010-04-23</span></li>
    <li><a href="#">标题一</a><span class="time">2010-04-23</span></li>
    <li><a href="#">标题一</a><span class="time">2010-04-23</span></li>
    <li><a href="#">标题一</a><span class="time">2010-04-23</span></li>
    <li><a href="#">标题一</a><span class="time">2010-04-23</span></li>
    <li><a href="#">标题一</a><span class="time">2010-04-23</span></li>
    <li><a href="#">标题一</a><span class="time">2010-04-23</span></li>
    </ul>
</div>
position:relative;
父级 overflow:scroll时，
IE6子级不随滚动条滚动，IE7也没有修改这个BUG
解决方案：父级元素添加 "position:relative;left:0;top:0;"
修复后的实例如下，请使用IE6或IE7查看。