:checked CSS 伪类选择器表示任何处于选中状态的radio(<input type="radio">), checkbox (<input type="checkbox">) 或("select") 元素中的option HTML元素("option")。

/* 匹配任意被勾选/选中的radio(单选按钮),checkbox(复选框),或者option(select中的一项) */
:checked { 
  margin-left: 25px; 
  border: 1px solid blue; 
} 

用户通过勾选/选中元素或取消勾选/取消选中,来改变该元素的 :checked 状态。

Note:因为浏览器经常将<option>视为可替换元素,因此不同的浏览器通过:checked伪类渲染出来的效果也不尽相同.

语法

:checked

示例

基础示例

HTML

<div>
  <input type="radio" name="my-input" id="yes">
  <label for="yes">Yes</label>

  <input type="radio" name="my-input" id="no">
  <label for="no">No</label>
</div>

<div>
  <input type="checkbox" name="my-checkbox" id="opt-in">
  <label for="opt-in">Check me!</label>
</div>

<select name="my-select" id="fruit">
  <option value="opt1">Apples</option>
  <option value="opt2">Grapes</option>
  <option value="opt3">Pears</option>
</select>

CSS

div,
select {
  margin: 8px;
}

/* Labels for checked inputs */
input:checked + label {
  color: red;
}

/* Radio element, when checked */
input[type="radio"]:checked {
  box-shadow: 0 0 0 3px orange;
}

/* Checkbox element, when checked */
input[type="checkbox"]:checked {
  box-shadow: 0 0 0 3px hotpink;
}

/* Option elements, when selected */
option:checked {
  box-shadow: 0 0 0 3px lime;
  color: red;
}

Result

借用隐藏的checkbox来切换元素的样式(显示/隐藏)

这个例子利用了:checked伪类,让用户基于复选框的状态切换内容,而无需使用JavaScript。

HTML

<input type="checkbox" id="expand-toggle" />

<table>
  <thead>
    <tr><th>Column #1</th><th>Column #2</th><th>Column #3</th></tr>
  </thead>
  <tbody>
    <tr class="expandable"><td>[more text]</td><td>[more text]</td><td>[more text]</td></tr>
    <tr><td>[cell text]</td><td>[cell text]</td><td>[cell text]</td></tr>
    <tr><td>[cell text]</td><td>[cell text]</td><td>[cell text]</td></tr>
    <tr class="expandable"><td>[more text]</td><td>[more text]</td><td>[more text]</td></tr>
    <tr class="expandable"><td>[more text]</td><td>[more text]</td><td>[more text]</td></tr>
  </tbody>
</table>

<label for="expand-toggle" id="expand-btn">Toggle hidden rows</label>

CSS

/* Hide the toggle checkbox */
#expand-toggle {
  display: none;
}

/* Hide expandable content by default */
.expandable {
  visibility: collapse;
  background: #ddd;
}

/* Style the button */
#expand-btn {
  display: inline-block;
  margin-top: 12px;
  padding: 5px 11px;
  background-color: #ff7;
  border: 1px solid;
  border-radius: 3px;
}

/* Show hidden content when the checkbox is checked */
#expand-toggle:checked ~ * .expandable {
  visibility: visible;
}

/* Style the button when the checkbox is checked */
#expand-toggle:checked ~ #expand-btn {
  background-color: #ccc;
}

Result

图片相册

同时,可以使用隐藏的radioboxes中的:checked伪类来构建一个只有在鼠标单击“预览”时,图片才会以全尺寸展示的图片相册,查看演示

注: 一个类似的效果,基于:hover伪类和没有隐藏的radioboxes,查看这个演示,来自:hover页面。

规范

规格  级别 附注
HTML Living Standard
:checked
Living Standard No change.
HTML5
:checked
Recommendation Defines the semantic regarding HTML.
Selectors Level 4
:checked
Working Draft No change.
CSS Basic User Interface Module Level 3
:checked
Recommendation Link to Selectors Level 3.
Selectors Level 3
:checked
Recommendation Defines the pseudo-class, but not the associated semantic

浏览器兼容性

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
:checkedChrome Full support 1Edge Full support YesFirefox Full support 1IE Full support 9Opera Full support 9Safari Full support 3.1WebView Android Full support 2Chrome Android ? Edge Mobile Full support YesFirefox Android Full support 4Opera Android Full support 9.5Safari iOS Full support 3.1Samsung Internet Android ?

Legend

Full support  
Full support
Compatibility unknown  
Compatibility unknown

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