: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 :default CSS pseudo-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 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
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>'s default 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" id="spring" value="spring" />
<label for="spring">Spring</label>
<input type="radio" name="season" id="summer" value="summer" checked />
<label for="summer">Summer</label>
<input type="radio" name="season" id="fall" value="fall" />
<label for="fall">Fall</label>
<input type="radio" name="season" id="winter" 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
[フレーム]
Specifications
| Specification |
|---|
| HTML # selector-default |
| Selectors Level 4 # default-pseudo |
Browser compatibility
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See also
- Web forms — Working with user data
- Styling web forms
- Related HTML elements:
<button>,<input type="checkbox">,<input type="radio">, and<option>