:default
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.
The:defaultCSSpseudo-class selects form elements that are the default in a group of related elements.
Try it
label,input[type="submit"] { display: block; margin-top: 1em;}input:default { border: none; outline: 2px solid deeppink;}<form> <p>How did you find out about us?</p> <label ><input name="origin" type="radio" value="google" checked /> Google</label > <label><input name="origin" type="radio" value="facebook" /> Facebook</label> <p>Please agree to our terms:</p> <label ><input name="newsletter" type="checkbox" checked /> I want to subscribe to a personalized newsletter.</label > <label ><input name="privacy" type="checkbox" /> I have read and I agree to the Privacy Policy.</label > <input type="submit" value="Submit form" /></form>What this selector matches is defined inHTML 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
selectedattribute, or the first enabled option in DOM order.multiple<select>s can have more than oneselectedoption, so all will match:default. <input type="checkbox">and<input type="radio">match if they have thecheckedattribute.<button>matches if it is a<form>'sdefault submission button: the first<button>in DOM order that belongs to the form. This also applies to<input>types that submit forms, likeimageorsubmit.
Syntax
css
:default { /* ... */}Examples
HTML
html
<fieldset> <legend>Favorite season</legend> <input type="radio" name="season" value="spring" /> <label for="spring">Spring</label> <input type="radio" name="season" value="summer" checked /> <label for="summer">Summer</label> <input type="radio" name="season" value="fall" /> <label for="fall">Fall</label> <input type="radio" name="season" value="winter" /> <label for="winter">Winter</label></fieldset>CSS
css
input:default { box-shadow: 0 0 2px 1px coral;}input:default + label { color: coral;}Result
Specifications
| Specification |
|---|
| HTML # selector-default |
| Selectors Level 4 # default-pseudo |
Browser compatibility
See also
- Web forms — Working with user data
- Styling web forms
- Related HTML elements:
<button>,<input type="checkbox">,<input type="radio">, and<option>