:checked

:checked CSS 의사 클래스 선택자는 선택했거나 on 상태인 라디오(<input type="radio">), 체크박스(<input type="checkbox">), 옵션(<option> 요소를 나타냅니다.

/* Matches any checked/selected radio, checkbox, or option */
:checked {
  margin-left: 25px;
  border: 1px solid blue;
}

사용자가 요소를 체크했거나 선택한 경우 활성화되고, 체크나 선택을 해제하는 경우 비활성화됩니다.

참고: 많은 경우 브라우저는 <option> 요소를 대체 요소로 취급하므로, :checked 의사 클래스를 사용한 스타일을 적용할 수 있는 범위도 브라우저마다 다릅니다.

구문

:checked

예제

기본 예제

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;
}

결과

숨겨진 체크박스를 사용해 요소 켜고 끄기

다음 예제 코드는 :checked 의사 클래스와 체크박스를 사용해, JavaScript 없이도 사용자가 켜거나 끌 수 있는 콘텐츠를 구현합니다.

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;
}

결과

명세

Specification Status Comment
HTML Living Standard
The definition of ':checked' in that specification.
Living Standard No change.
HTML5
The definition of ':checked' in that specification.
Recommendation Defines the semantic regarding HTML.
Selectors Level 4
The definition of ':checked' in that specification.
Working Draft No change.
Selectors Level 3
The definition of ':checked' in that specification.
Recommendation Defines the pseudo-class, but not the associated semantic

브라우저 호환성

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
:checkedChrome Full support 1
Notes
Full support 1
Notes
Notes On macOS, styling <option&rt; elements has no effect.
Edge Full support 12
Notes
Full support 12
Notes
Notes On macOS, styling <option&rt; elements has no effect.
Firefox Full support 1
Notes
Full support 1
Notes
Notes From Firefox 56, <option&rt; elements cannot be styled.
Notes On macOS, styling <option&rt; elements has no effect.
IE Full support 9Opera Full support 9
Notes
Full support 9
Notes
Notes On macOS, styling <option&rt; elements has no effect.
Safari Full support 3.1
Notes
Full support 3.1
Notes
Notes Styling <option&rt; elements has no effect.
WebView Android Full support 2Chrome Android Full support 18Firefox Android Full support 4
Notes
Full support 4
Notes
Notes From Firefox 56, <option&rt; elements cannot be styled.
Opera Android Full support 10.1Safari iOS Full support 3.1
Notes
Full support 3.1
Notes
Notes Styling <option&rt; elements has no effect.
Samsung Internet Android Full support 1.0

Legend

Full support  
Full support
See implementation notes.
See implementation notes.