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Add CSS pseudo class default #568

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194 changes: 194 additions & 0 deletions _features/css-pseudo-class-default.md
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---
title: ":default"
description: "Selects form elements that are the default in a group of related elements."
category: css
keywords: pseudo-class, form
tags: accessibility
last_test_date: "2026-02-05"
test_url: "/tests/css-pseudo-class-default.html"
test_results_url: "https://testi.at/proj/7ov4sbxz1krv07gkf5"
stats: {
apple-mail: {
macos: {
"12":"y",
"26":"y"
},
ios: {
"11":"y",
"26":"y"
}
},
gmail: {
desktop-webmail: {
"2026-02":"n"
},
ios: {
"2026-02":"n"
},
android: {
"2026-02":"n"
},
mobile-webmail: {
"2026-02":"n"
}
},
orange: {
desktop-webmail: {
"2026-02":"u"
},
ios: {
"2026-02":"u"
},
android: {
"2026-02":"u"
}
},
outlook: {
windows: {
"2007":"n",
"2010":"n",
"2013":"n",
"2016":"n",
"2019":"n",
"2024":"n"
},
windows-mail: {
"2026-02":"n"
},
macos: {
"16.105.2":"y"
},
outlook-com: {
"2026-02":"a #1"
},
ios: {
"2026-02":"y"
},
android: {
"2026-02":"y"
}
},
samsung-email: {
android: {
"6.0":"u"
}
},
sfr: {
desktop-webmail: {
"2026-02":"u"
},
ios: {
"2026-02":"u"
},
android: {
"2026-02":"u"
}
},
thunderbird: {
macos: {
"147.0.1":"y"
}
},
aol: {
desktop-webmail: {
"2026-02":"y"
},
ios: {
"2026-02":"y"
},
android: {
"2026-02":"y"
}
},
yahoo: {
desktop-webmail: {
"2026-02":"y"
},
ios: {
"2026-02":"y"
},
android: {
"2026-02":"y"
}
},
protonmail: {
desktop-webmail: {
"2026-02":"n"
},
ios: {
"2026-02":"n"
},
android: {
"2026-02":"n"
}
},
hey: {
desktop-webmail: {
"2026-02":"u"
}
},
mail-ru: {
desktop-webmail: {
"2026-02":"y"
}
},
fastmail: {
desktop-webmail: {
"2026-02": "u"
}
},
laposte: {
desktop-webmail: {
"2026-02": "u"
}
},
free-fr: {
desktop-webmail: {
"2026-02": "u"
}
},
t-online-de: {
desktop-webmail: {
"2026-02": "n"
}
},
gmx: {
desktop-webmail: {
"2026-02": "n"
},
ios: {
"2026-02": "y"
},
android: {
"2026-02": "n"
}
},
web-de: {
desktop-webmail: {
"2026-02": "n"
},
ios: {
"2026-02": "u"
},
android: {
"2026-02": "u"
}
},
ionos-1and1: {
desktop-webmail: {
"2026-02": "u"
},
android: {
"2026-02": "u"
}
}
}
notes: "Depends on device/browser support. Some devices/browsers do not support styling on <option>."
notes_by_num: {
"1": "Works on input[radio] and input[checkbox] only.",
}
links: {
"Can I use: :default CSS pseudo-class":"https://caniuse.com/css-default-pseudo",
"MDN: :default CSS pseudo-class":"https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Selectors/:default"
}
---
148 changes: 148 additions & 0 deletions tests/css-pseudo-class-default.html
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<!DOCTYPE html>
<html lang="en" xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office">
<head></head>
<head>
<meta charset="UTF-8" />
<title>CSS Pseudo Class :default</title>
<meta name="viewport" content="width=device-width, initial-scale=1" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="x-apple-disable-message-reformatting" />
<!--[if mso]>
<xml>
<o:OfficeDocumentSettings>
<o:PixelsPerInch>96</o:PixelsPerInch>
</o:OfficeDocumentSettings>
</xml>
<![endif]-->
<style>
input:default {
color: #ff0000;
outline: 2px solid #ff0000;
}
button:default {
color: #ff0000;
outline: 2px solid #ff0000;
}
option:default {
text-align:right;
}
label {
font-size:14px;
font-family:sans-serif;
}
sup {
line-height:0.5;
font-size: 60%;
}
</style>
</head>
<body>
<div style="max-width:600px; margin:0 auto;">
<h1 style="margin:0 0 1em; font:38px Palatino, serif; color:#000; background:none; border:none;">
Pseudo-class :default
</h1>
<h2 style="margin:0 0 1em; font:bold 16px monospace;">
:default on various elements in a <i>form</i>
</h2>
<div class="form-test" style="font:20px serif;">
<form action="">
<p style="font:16px monospace; margin:10px 0 0;"><b>&lt;input&gt;</b> [checkbox]<sup>*</sup></p>
<label><input type="checkbox" name="check" id="check1" value="check1" checked />Check 1</label>
<label><input type="checkbox" name="check" id="check2" value="check2" />Check 2</label>
<label><input type="checkbox" name="check" id="check3" value="check3" />Check 3</label>
<br>
<p style="font:16px monospace; margin:10px 0 0;"><b>&lt;input&gt;</b> [radio]<sup>*</sup></p>
<label><input type="radio" name="radio" id="radio1" value="radio1" checked />Radio 1</label>
<label><input type="radio" name="radio" id="radio2" value="radio2" />Radio 2</label>
<label><input type="radio" name="radio" id="radio3" value="radio3" />Radio 3</label>
<br>
<label for="opt-select">
<p style="font:16px monospace; margin:10px 0 0;"><b>&lt;select&gt;</b> with &lt;option&gt;<sup>**</sup></p>
</label>
<select id="opt-select" name="option-select" style="font-size:14px; width:300px;">
<option value="">Select an option</option>
<option value="opt1" selected>O1-RIGHT</option>
<option value="opt2">Option 2</option>
<option value="opt3">Option 3</option>
</select>
<br>
<p style="font:16px monospace; margin:10px 0 0;">Input type submit<sup>*</sup></p>
<input type="submit" value="Submit" name="submit-input">
</form>

<br>
<div style="background-color:#000000; line-height:4px;">&nbsp;</div>
<br>

<h2 style="margin:0 0 1em; font:bold 16px monospace;">
:default on button element in a <i>form</i>
</h2>
<form action="">
<p style="font:16px monospace; margin:10px 0 0;">Button element<sup>*</sup></p>
<button name="submit-button" id="submit" value="button">Button</button>
</form>

<br>
<div style="background-color:#000000; line-height:4px;">&nbsp;</div>
<br>

<h2 style="margin:0 0 1em; font:bold 16px monospace;">
:default on radio + checkbox <i>outside</i> of a form
</h2>
<div>
<p style="font:16px monospace; margin:10px 0 0;"><b>&lt;input&gt;</b> [checkbox]<sup>*</sup></p>
<label><input type="checkbox" name="check-outside" id="check-outside-1" value="check1" checked />Check 1</label>
<label><input type="checkbox" name="check-outside" id="check-outside-2" value="check2" />Check 2</label>
<label><input type="checkbox" name="check-outside" id="check-outside-3" value="check3" />Check 3</label>
<br>
<p style="font:16px monospace; margin:10px 0 0;"><b>&lt;input&gt;</b> [radio]<sup>*</sup></p>
<label><input type="radio" name="radio-outside" id="radio-outside-1" value="radio1" checked />Radio 1</label>
<label><input type="radio" name="radio-outside" id="radio-outside-2" value="radio2" />Radio 2</label>
<label><input type="radio" name="radio-outside" id="radio-outside-3" value="radio3" />Radio 3</label>
</form>
</div>

<br>
<div style="background-color:#000000; line-height:4px;">&nbsp;</div>
<br>

<p style="margin-top:1.6em; font:20px serif;">
*Default-selected (1st option) Checkbox, Radio, and Submit elements will be outlined in red if :default works.
</p>
<p style="margin-top:0; font:20px serif;">
**Select element will have default option (O1-RIGHT) right-aligned if default works.
</p>

<br>
<div style="background-color:#000000; line-height:4px;">&nbsp;</div>
<br>
<p style="margin-top:0; font:20px serif;">
Control tests

<form action="">
1.<button style="outline:2px solid #00FF00; color:#00FF00;">Button</button>
<br>
2.<input type="submit" style="outline:2px solid #00FF00; color:#00FF00;" value="Submit"/>
<br>
3.<input type="checkbox" name="test1" id="testcheck1" value="check1" style="outline:2px solid #00FF00;" />
<br>
4.<input type="radio" name="test2" id="testradio1" value="radio1" style="outline:2px solid #00FF00;" />
<br>
5.<select name="test-select-group" id="test-select" style="width:200px; text-align:center;">
<option value="Test1">Test 1</option>
<option value="Test2">Test 2</option>
</select>
</form>
</p>

<br>
<div style="background-color:#000000; line-height:4px;">&nbsp;</div>
<br>

<p style="margin-top:1.6em; font:20px serif;">
<a href="https://www.caniemail.com" style="color:#000; text-decoration:none;">caniemail.com</a>, 2026.
</p>

</div>
</body>
</html>