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HTML input required attributes

HTML input Tag Reference HTML <input> tag

Examples

HTML form with the required fields:

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

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Browser Support

Internet ExplorerFirefoxOperaGoogle ChromeSafari

Internet Explorer 10, Firefox, Opera and Chrome support required attributes.

Note: Safari or Internet Explorer 9 and earlier versions do not support the required attributes <input> attribute.

Definition and Usage

required attribute is a Boolean attribute.

required attribute specifies the input fields must be filled in before submitting the form.

Note: required attributes apply to the following input types: text, search, url, tel , email, password, date pickers, number, checkbox, radio and file.

Differences between HTML 4.01 and HTML5

required attribute is new in HTML5 attributes.

Differences between HTML and XHTML

In XHTML, prohibit attribute minimization, required attributes must be defined as <input required = "required" />.

grammar

<input required>

HTML input Tag Reference HTML <input> tag