css 文字与小图标对齐

.icon { 
    display: inline-block; 
    width:20px; height:20px; 
    background: url(delete.png) no-repeat center; 
    white-space:nowrap; 
    letter-spacing: -1em; 
    text-indent: -99em; 
    color: transparent;
    /* IE7 */
    *text-indent: 0;
    *zoom: expression( this.runtimeStyle['zoom'] = '1', this.innerHTML = '3000');
}
.icon:before { 
    content: '3000'; 
}

HTML代码：

<strong>情形1，空标签</strong>
<p><i class="icon"></i> 删除</p>
<strong>情形2，内部有文字</strong>
<p><a href="javascript:" class="icon">删除</a> 后面的文字</p>

<p style="color:gray;">--------下面是反例------</p>

<strong>设置了overflow:hidden</strong>
<p><i class="icon" style="overflow:hidden;"></i> 删除</p>