HTML <input> required Attribute

Example

An HTML form with a required input field:

<form action="/action_page.php">
<label for="username">Username:</label>
<input type="text" id="username" name="username" required>
<input type="submit">
</form>

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Definition and Usage

The required attribute is a boolean attribute.

When present, it specifies that an input field must be filled out before submitting the form.

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