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What is the checked selector?
In the form element, both the radio button radio and the checkbox checkbox have "checked" and "unchecked" states. In CSS3, we can define the CSS style when selected by using the :checked selector.
Currently only Opera browser supports: checked selector.
Example:
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>CSS3 :checked选择器</title>
<style type="text/css">
input:checked
{
background-color:red;
}
</style>
</head>
<body>
<form name="form1" method="post" action="index.html">
性别：
<input type="radio" name="Question1" value="boy" checked="checked"/>男
<input type="radio" name="Question1" value="girl"/>女<br/>
你喜欢的水果：<br />
<input id="checkbox1" type="checkbox" checked="checked"/><label for="checkbox1">苹果</label><br/>
<input id="checkbox2" type="checkbox" /><label for="checkbox2">香蕉</label><br/>
<input id="checkbox3" type="checkbox" /><label for="checkbox3">西瓜</label><br/>
<input id="checkbox4" type="checkbox" /><label for="checkbox4">凤梨</label>
</form>
</body>
</html>The effect is as follows:
Currently only the opera browser supports the :checked selector.
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