fieldset
Allows the grouping of related fields and text. This grouping allows the optimizing of layout and navigation. Fieldset elements may nest, providing the author with a means of specifying behavior across a wide variety of devices.

attributes

title
Specifies a title for this element, which may be used in the presentation of this object.
id
Provides an element with a unique name within a single deck.
class
Affiliates an element with one or more classes.
xml:lang
Specifies the natural or formal language in which the document is written.