CSS :optional Pseudo Class
The :optional selector selects optional elements.
Form elements are optional when attribute is not required. Form elements that can be selected using :optional are <input>, <select> and <textarea> without a required attribute.
The :optional selector can be linked with other selectors (e.g. :hover) and with pseudo-elements (e.g. ::after).
Version ¶
CSS Basic User Interface Module
CSS2 Universal Selector
Syntax¶
:optional {
css declarations;
}Example of the: optional selector:¶
<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
<style>
.example {
margin: 40px auto;
max-width: 400px;
}
label,
button {
display: block;
width: 100%;
margin-bottom: 1.5em;
}
input,
select,
button {
padding: .4em 1em;
}
input,
select {
border: 1px solid #666666;
}
input:optional,
select:optional {
background-color: #eeeeee;
color: #666666;
opacity: 0.5;
transition: .3s;
}
input:optional:hover,
select:optional:hover {
opacity: 1;
}
input:required,
textarea:required {
border-bottom: 3px solid #1c87c9;
}
</style>
</head>
<body>
<h2>:optional selector example</h2>
<div class="example">
<form action="#">
<label>
<input type="name" required>Name *
</label>
<label>
<input type="email" required>Email *
</label>
<label>
<input type="phone">Phone (optional)
</label>
<label>
<input type="url">Address (optional)
</label>
</form>
</div>
</body>
</html>In the given example both the :optional and the :required pseudo-class selectors are used.
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