HTML required Attribute

Example

<form action="action.php">
  <label for="fname">First name:</label>
  <input type="text" id="fname" name="fname" required><br>
  <input type="submit" value="Submit">
</form>

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Meaning

The required is a Boolean attribute specifies that the form field must be set in order for form submission to proceed.

User agents that understand this should set the CSS pseudo-class :invalid when the field goes into error.

The required attribute works with the following input types: text, search, url, tel, email, password, date, number, checkbox, radio, and file

Standard Syntax

HTML: <element required>
XHTML: <element required="required">

Applies to:

The required attribute can be used on the following element:

Element	Attribute
<input>	required
<select>	required
<textarea>	required

Attribute Values

Value	Description
required	This is a boolean attribute, the presence of a boolean attribute on an element represents the true value, and the absence of the attribute represents the false value.