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>                   