复制代码代码如下:
.alpha{
width: 100px;
height: 100px;
color: #fff;
background: rgba(0, 0, 0, .3);
filter: progid:DXImageTransform.Microsoft.gradient(gradientType = 0, startColorstr = #50000000, endColorstr = #50000000)9;
}
:root .alpha{
filter: none;
}
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