HTML <input> required Attribute

HTML input Tag Reference HTML <input> tag


An HTML form with a required input field:

<form action="demo_form.asp">
  Username: <input type="text" name="usrname" required>
  <input type="submit">

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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.

Browser Support

The numbers in the table specify the first browser version that fully supports the 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" />.


<input required>

HTML input Tag Reference HTML <input> tag


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