HTML <input> required Attribute
An HTML form with a required input field:
Username: <input type="text" name="usrname" required>
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The required attribute is supported in Internet Explorer 10, Firefox, Opera, and Chrome.
Note: The required attribute of the <input> tag is not supported in Internet Explorer 9 and earlier versions, or in Safari.
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.
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" />.
HTML <input> tag
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