css background transparent text opaque_html/css_WEB-ITnose
测试背景透明度为0.3。文字不透明：
background-color: #000;/* 一、CSS3的opacity */opacity: 0.3; /* 兼容浏览器为：firefox，chrome，IE9+ 文字也跟着透明*/
/* 二、CSS3的rgba */ background: rgba(0, 0, 0, 0.3); /* 兼容浏览器为：firefox，chrome，IE9+ 其中IE8，IE7，IE6解析为背景全透明 文字不透明 */
/* 三、IE专属滤镜 */ filter:alpha(opacity=30); *zoom: 1; /* 兼容浏览器为：IE6，7，8，9(需触发haslayout)* 文字透明 当设置div里面元素的属性为rel相对定位，文字不透明*/ /*或*/filter:progid:DXImageTransform.Microsoft.gradient(startColorstr=#7f000000,endColorstr=#7f000000);*zoom: 1; /*兼容浏览器也是IE6，7，8，9 无须设置rel 文字不透明*/
当要使得文字不透明，使用二，三时，ie9两个属性都支持一起使用会重复降低不透明度。
解决方案一：
①只针对ie7,8使用滤镜，其他用rgba处理。
②或者使用:root .test{filter:none;}可以去除IE9下的滤镜 （推荐使用，代码量少）
注意：据说是IEtester不支持滤镜，所以测试不到ie6的效果
.box { background: rgba(0, 0, 0, 0.3); } @media \0screen\,screen\9 { /* 只支持IE6、7、8 */ .box { background-color: #000; filter: alpha(opacity=30); *zoom: 1; } } .box p { position: relative; }解决方案二：
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