Example
An HTML form with a required input field:
<form action="demo_form.asp">
Username: <input type="text" name="usrname" required>
<input type="submit">
</form>
Try it Yourself »
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.
Browser Support
The numbers in the table specify the first browser version that fully supports the attribute.
| Attribute | |||||
|---|---|---|---|---|---|
| required | 5.0 | 10.0 | 4.0 | Not supported | 9.6 |
Differences Between HTML 4.01 and HTML5
The required attribute is new in HTML5.
Differences Between HTML and XHTML
In XHTML, attribute minimization is forbidden, and the required attribute must be defined as <input required="required" />.
Syntax
<input required>