:valid
:valid
该:validCSS伪类用于匹配<input>或<form>元素且要求其输入内容正确地满足输入类型的设定。这样使我们可以很容易地对效字段采用不同的外观，以帮助用户确认其数据格式正确。
input:valid {
background-color: #ddffdd;
}
语法
:valid
实例
这个例子提供了一个简单的表单，它在验证正确时将元素设为绿色，而当元素不满足时则为红色。
HTML
<form>
<label>Enter a URL:</label>
<input type="url" />
<br />
<br />
<label>Enter an email address:</label>
<input type="email" required/>
</form>
CSS
input:invalid {
background-color: #ffdddd;
}
form:invalid {
border: 5px solid #ffdddd;
}
input:valid {
background-color: #ddffdd;
}
form:valid {
border: 5px solid #ddffdd;
}
input:required {
border-color: #800000;
border-width: 3px;
}
input:required:valid {
border-color: #008000;
}
规范
| Specification | Status | Comment |
|---|---|---|
| HTML Living StandardThe definition of ':valid' in that specification. | Living Standard | No change |
| HTML5The definition of ':valid' in that specification. | Recommendation | Defines the semantic regarding HTML and constraint validation. |
| Selectors Level 4The definition of ':valid' in that specification. | Working Draft | Initial definition |
浏览器兼容性
| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support (<input>) | 10.0 | 20 (12.10240) | 4.0 (2) | 10 | 10.0 | 5.0 |
| Apply it to <form> | (Yes) | No support | 13 (13) | No support | (Yes) | ? |
| Feature | Android | Edge | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | ? | (Yes) | 4.0 (2) | No support | 10.0 | 5.0 |
| Apply it to <form> | ? | No support | 13.0 (13) | No support | ? | ? |
