From CodeMonkeyWiki

Contents 1 transparency 2 Regex 3 multiple classes

transparency

  filter:alpha(opacity=66);
  opacity: 0.66;
  -moz-opacity:0.66;

Regex

a[href ^="http://somedomain.com"] { 
  color: red;
}

a[href ^="http://anotherdomain.com"] { 
  color: blue;
}

multiple classes

<style>
.class1 { background-color: blue; }
.class2 { font-weight: bold; }
.class3 { color: red; }
</style>

<div class="class1 class2 class3"> </div>