The: optional selector in CSS is used to select and style the form input elements which are optional. That is it can select those input elements from an HTML form that are not declared as “required”.
Syntax:
:optional {
/* css declarations; */
}Example:
HTML
<!DOCTYPE html><html>
<head>
<title>optional Selector</title>
<style>
/* Select optional fields and change
color to Yellow */
input:optional {
background-color: yellow;
}
h1 {
color: green;
}
h1,
h2 {
text-align: center;
}
</style>
</head>
<body>
<h1>GeeksForGeeks</h1>
<h3>A demonstration of the :optional selector.</h3>
<!-- Create an HTML form -->
<form>
<!-- Optional Input -->
<label>An optional input element:</label><br />
<input>
<br /><br />
<!-- Required Input -->
<label>A required input element:</label><br />
<input required>
</form>
<p>
The :optional selector selects form elements
with no "required" attribute.
</p>
</body>
</html>
|
Output:
Supported Browser:
- Google Chrome 10.0
- Edge 12.0
- Firefox 4.0
- Safari 5.0
- Opera 10.0