http://www.xulplanet.com/tutorials/xultu/inputs.html http://www.xulplanet.com/reference/elemref/ref_radio.html An element that can be turned on and off. Radio buttons are almost always grouped together in groups. Only one radio button within the same radiogroup may be selected at a time. The user can switch which radio button is turned on by selecting it with the mouse or keyboard. Other radio buttons in the same group are turned off. A label, specified with the label attribute may be added beside the radio button to indicate to the user as to its function. nsIAccessibleProvider nsIDOMXULSelectControlItemElement nsIDOMXULLabeledControlElement This should be set to a letter that is used as a shortcut key. This letter should be one of the characters that appears in the label text for the radio. This letter will typically be drawn underlined, although this behavior will be platform and theme specific. When the user presses ALT (or a similar key that varies on each platform) and the access key, the radio will be activated from anywhere in the window. Although the value is case insensitive, a letter with the case matching the accesskey attribute will used if both cases exist in the label. Set to the id of a command element that is being observed by the element. If the label of the radio is too small to fit in its given space, the text will be cropped on the side specified by the crop attribute. An ellipsis will be used in place of the cropped text. If the box direction is reversed, the cropping is reversed. The text will be cropped on its left side. The text will be cropped on its right side. (Deprecated) The text will be cropped on its left side. (Deprecated) The text will be cropped on its right side. The text will be cropped on both sides. The text will be not be cropped using an ellipsis. However, the text will simply be cut off if it is too large. The side depends on the CSS text alignment. Indicates whether the radio is disabled or not. If this attribute is set to true, the radio is disabled. This is usually drawn with the text in grey. If the radio is disabled, it does not respond to user actions. The element cannot be focused and the command event will not fire. The element will still respond to mouse events. To enable the radio, leave the attribute out entirely as opposed to setting the value to false. This attribute is set to true if the radio element is focused. The URL of the image to appear on the radio. If this is attribute is left out, no image appears. The position of the image is determined by the dir and orient attributes. The label that will appear beside the radio. If this is left out, no text appears. The labels on radio buttons will wrap if there is not enough space. This attribute is set to true if the radio button is selected. To change the currently selected radio button, modify either the selectedIndex or selectedItem property of the radiogroup. The tab order of the element. The tab order is the order in which the focus is moved when the user presses the Tab key. Elements with a higher tabindex are later in the tab order sequence. You can associate a data value with each radio button. Returns the accessibility object for the radio. Returns the enclosing radiogroup that the radio element is contained within, which may or may not be its direct parent. This read-only property returns true if the radio button is selected.