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HTML | required Attribute

  • Difficulty Level : Basic
  • Last Updated : 07 Oct, 2021

It is a Boolean attribute which is used to specify that the input element must be filled out before submitting the Form.
Elements: This attributes can be associated with three elements which are listed below:  

  • <input>
  • <select>
  • <textarea>

 

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  • Syntax: 
<input required>
  • Example-1: 

html




<!DOCTYPE html>
<html>
    <head>
        <title>required Attribute</title>
        <style>
            h1, h2 {
                color:green;
                font-style:italic;
            }
            body {
                text-align:center;
            }
        </style>
    </head>
    <body>
        <h1>GeeksForGeeks</h1>
        <h2>required attribute in input Field</h2>
        <form action="">
            Username:
            <input type="text" name="username" required>
            <br>
            Password:
            <input type="password"name="password">
            <br>
            <input type="submit">
        </form>
    </body>
</html>                   
  • Output: 
     

  • Syntax: 
<select required>
  • Example-2: 

html




<!DOCTYPE html>
<html>
    <head>
        <title>required Attribute</title>
        <style>
            h1, h2 {
                color:green;
                font-style:italic;
            }
            body {
                text-align:center;
            }
        </style>
    </head>
    <body>
        <h1>GeeksForGeeks</h1>
        <h2>required attribute in select Field</h2>
        <form action="">
            <select required>
                <option value="">None</option>
                <option value="ds">Data Structure</option>
                <option value="algo">Algorithm</option>
                <option value="os">Operating System</option>
                <option value="cn">Computer Network</option>
            </select>
            <input type="submit">
        </form>
    </body>
</html>                   
  • Output: 
     

  • Syntax: 
<textarea required>
  • Example-3: 

html




<!DOCTYPE html>
<html>
    <head>
        <title>required Attribute</title>
        <style>
            h1, h2 {
                color:green;
                font-style:italic;
            }
            body {
                text-align:center;
            }
        </style>
    </head>
    <body>
        <h1>GeeksForGeeks</h1>
        <h2>required attribute in Textarea Field</h2>
        <form action="">
            <textarea rows="7" cols="50"
                             name="comment" required>
            </textarea>
            <input type="submit">
        </form>
    </body>
</html>                   
  • Output: 
     

Supported Browsers: The browser supported by required attribute are listed below: 

  • Google Chrome 5.0+
  • Internet Explorer 11.0+
  • Firefox 4+
  • Opera 9.7+ 



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