Navigator 2.0, Internet Explorer 3.0
The defaultChecked property is a read-only Boolean value that specifies whether a Checkbox or Radio element is checked by default. This property has no meaning for other form elements. This property corresponds to the CHECKED attribute in the HTML <INPUT> tag that created the form element. If CHECKED was present then defaultChecked will be true. Otherwise, defaultChecked will be false.
The defaultChecked property is used to restore the Checkbox or Radio element to its default value when the form is reset.