The nestable FIELDSET element is used to group related form fields
together. The grouping of form fields allows for a more intuitive visual
user interface while also giving speech-based navigation methods better
cues of how to render a page.
The suggested rendering for the FIELDSET element is left to the
browser, but will usually take the form of a box around the contents of
the FIELDSET. If the optional LEGEND element is present directly after
the opening FIELDSET tag, its contents are transposed on top of the
region of the FIELDSET bounding box specified in the ALIGN attribute of
the LEGEND element.