You’re reading the English version of this content since no translation exists yet for this locale. Help us translate this article!
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:
- A default option element is the first one with the
selected
attribute, or the first enabled option in DOM order.multiple
<select>
s can have more than oneselected
option, so all will match:default
. <input type="checkbox">
and<input type="radio">
match if they have thechecked
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, likeimage
orsubmit
.)
Syntax
:default
Example
HTML
<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>
CSS
input:default { box-shadow: 0 0 2px 1px coral; } input:default + label { color: coral; }
Result
Specifications
Specification | Status | Comment |
---|---|---|
HTML Living Standard The definition of ':default' in that specification. |
Living Standard | No change. |
HTML5 The definition of ':default' in that specification. |
Recommendation | Defines associated HTML semantics and constraint validation. |
Selectors Level 4 The definition of ':default' in that specification. |
Working Draft | No change. |
CSS Basic User Interface Module Level 3 The definition of ':default' in that specification. |
Recommendation | Initial definition, but without the associated semantics. |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
:default | Chrome Full support 10 | Edge No support No | Firefox Full support 4 | IE No support No | Opera Full support 10 | Safari Full support 5 | WebView Android Full support 37 | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support 10.1 | Safari iOS Full support 5 | Samsung Internet Android Full support 1.0 |
Legend
- Full support
- Full support
- No support
- No support