Compatibility background color translucent CSS code (does not affect inner child elements)

background-color: rgba(<span style="color: #800080;">0</span>, <span style="color: #800080;">0</span>, <span style="color: #800080;">0</span>, .<span style="color: #800080;">25</span><span style="color: #000000;">);
filter: progid:DXImageTransform.Microsoft.Gradient(startColorStr</span>=#<span style="color: #800080;">40000000</span>,endColorStr=#<span style="color: #800080;">40000000</span>);

<style type=<span style="color: #800000;">"</span><span style="color: #800000;">text/css</span><span style="color: #800000;">"</span>><span style="color: #000000;">
.menu</span>-nav-<span style="color: #000000;">bg {
    background</span>-color: rgba(<span style="color: #800080;">0</span>, <span style="color: #800080;">0</span>, <span style="color: #800080;">0</span>, .<span style="color: #800080;">25</span><span style="color: #000000;">);
    filter: progid:DXImageTransform.Microsoft.Gradient(startColorStr</span>=#<span style="color: #800080;">40000000</span>,endColorStr=#<span style="color: #800080;">40000000</span><span style="color: #000000;">);
}
</span><span style="color: #008000;">/*</span><span style="color: #008000;"> css hack: rgba background with IE filter alternative: IE9 renders both! </span><span style="color: #008000;">*/</span><span style="color: #000000;">
.menu</span>-nav-<span style="color: #000000;">bg:not([dummy]) {
   filter: progid:DXImageTransform.Microsoft.Gradient(enabled</span>=<span style="color: #800000;">'</span><span style="color: #800000;">false</span><span style="color: #800000;">'</span><span style="color: #000000;">);
}
</span><span style="color: #008000;">/*</span><span style="color: #008000;"> 对于IE9，除了使用 :not([dummy]) hack 外，还可以使用 :root，推荐使用这个
 * :root 选择器已经被现代主流浏览器支持了，除了IE8及以下IE浏览器
 </span><span style="color: #008000;">*/</span><span style="color: #000000;">
:root .menu</span>-nav-<span style="color: #000000;">bg {
   filter: progid:DXImageTransform.Microsoft.Gradient(enabled</span>=<span style="color: #800000;">'</span><span style="color: #800000;">false</span><span style="color: #800000;">'</span><span style="color: #000000;">);
}
</span></style>
<div <span style="color: #0000ff;">class</span>=<span style="color: #800000;">"</span><span style="color: #800000;">menu-nav-bg</span><span style="color: #800000;">"</span>>
    <a href=<span style="color: #800000;">"</span><span style="color: #800000;">#</span><span style="color: #800000;">"</span>>我的首页</a>
    |
    <a href=<span style="color: #800000;">"</span><span style="color: #800000;">#</span><span style="color: #800000;">"</span>>我的微博</a>
</div>