CSS | optional Selector

Last Updated : 27 Dec, 2018

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 which are not declared as “required”.

Syntax:

:optional {
  /* css declarations; */
}

Example:

<!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>                    