The :default CSS pseudo-class selects form elements that are the default in a group of related elements.
The :default CSS pseudo-class selects form elements that are the default in a group of related elements.
What this selector matches is defined in HTML Standard §4.16.3 Pseudo-classes — it may match the <button>, <input type="checkbox">, <input type="radio">, and <option> elements:
selected attribute, or the first enabled option in DOM order. multiple <select>s can have more than one selected option, so all will match :default.<input type="checkbox"> and <input type="radio"> match if they have the checked attribute.<button> matches if it is a <form>'s default submission button: the first <button> in DOM order that belongs to the form. This also applies to <input> types that submit forms, like image or submit.:default
<fieldset> <legend>Favorite season</legend> <input type="radio" name="season" id="spring"> <label for="spring">Spring</label> <input type="radio" name="season" id="summer" checked> <label for="summer">Summer</label> <input type="radio" name="season" id="fall"> <label for="fall">Fall</label> <input type="radio" name="season" id="winter"> <label for="winter">Winter</label> </fieldset>
input:default { box-shadow: 0 0 2px 1px coral; } input:default + label { color: coral; }
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
:default |
10 |
79 |
4 |
No |
10 |
5 |
37 |
18 |
4 |
10.1 |
5 |
1.0 |
<button>, <input type="checkbox">, <input type="radio">, and <option>