See input (type="radio").

This is single character key that either gives focus to a radio element or activates a form control or link action.

Removes focus from the current radio object, at which time the radio object's onblur event fires.

Specifies whether the radio element is available for user interaction. When set to true, the element cannot receive focus or be modified by the user

Gives focus from the current radio object, at which time the radio object's onfocus event fires.

Used with IE data binding, returns an integer representing the record within the data set that generated the element (i.e., an element whose

This is a number that indicates the sequence of this radio element within the tabbing order of all focusable elements in the document.