A list of IDs of other elements, indicating that those elements contributed input values to (or otherwise affected) the calculation.
The <form> element that this element is associated with (its "form owner"). The value of the attribute must be an ID of a <form> element in the same document. If this attribute is not specified, the <output> element must be a descendant of a <form> element. This attribute enables you to place <output> elements anywhere within a document, not just as descendants of their <form> elements.