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On form submission, how could you possibly mark a checkbox/radiobutton as required?
Source of inspiration: Pekka's answer to a question
291
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 purpose of the HTML checked attribute is to define whether a checkbox or a radio button is checked (i.e. selected). HTML checked attribute supports input element.
If you put required on a radio button, one radio button of the same named group of radio buttons will be required, though not necessarily the one with the required attribute on it. On checkboxes, each individual checkbox with the required attribute is required, and must be checked.
The value attribute is a string containing the radio button's value. The value is never shown to the user by their user agent. Instead, it's used to identify which radio button in a group is selected.
Required checkboxes are not unusual. Practically every registration form uses some form of the "I have read and accept the User Agreement" checkbox.
If you have Opera handy try out the code below. The form won't submit unless the checkbox is checked.
<!doctype html>
<html>
<head>
<title>html5</title>
</head>
<body>
<h1>html5 test</h1>
<form action="/">
<input type="checkbox" required="required" id="cb" name="cb">
<label for="cb">required checkbox</label>
<input type="submit">
</form>
</body>
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