CSS | optional Selector - GeeksforGeeks

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>                     

Output:

Supported Browser: The browser supported by “:optional” selector are listed below:

Google Chrome 50.0, 4.0 -webkit-
Internet Explorer 10.0
Firefox 52.0, 2.0 -moz-
Safari 9.0, 3.1 -webkit-
Opera 37.0, 15.0 -webkit-, 11.1

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