代码示例：（标识：eg_css_sel_enabled_disabled2）
<!DOCTYPE html>
<html>
<head>
<style>
input:enabled
{
background:#ffff00;
}
input:disabled
{
background:#dddddd;
}
</style>
</head>
<body>
<form action="">
First name: <input type="text" value="Mickey" /><br>
Last name: <input type="text" value="Mouse" /><br>
Country: <input type="text" disabled="disabled" value="Disneyland" /><br>
Password: <input type="password" name="password" /><br>
<input type="radio" value="male" name="gender" /> Male<br>
<input type="radio" value="female" name="gender" /> Female<br>
<input type="checkbox" value="Bike" /> I have a bike<br>
<input type="checkbox" value="Car" /> I have a car
</form>
<p><b>注释：</b>本例只在 Opera 中正确地工作！</p>
</body>
</html>
