An HTML form with a required input field:
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.
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 |
The required attribute is new in HTML5.
In XHTML, attribute minimization is forbidden, and the required attribute must be defined as <input required="required" />.