子要素に親の不透明度を継承させたくありません。[ここにリンクの説明を入力][1]
[1]: http://jsfiddle.net/xALAW/ jsfiddle
<html>
<head></head>
<body>
<div class='hasopacity'>
This is the text with some opacity
<div class='noopacity'>
This is the text with no opacity
</div>
</div>
</body>
CSS
.hasopacity{opacity:0.5}
.noopacity{opacity:1}