FootnoteDisplay
Represents the selected footnote display mode.
Block = 0
The footnote element is placed in the footnote
area as a block element.
Compact = 2
The user agent determines whether a given footnote
element is placed as a block element or an inline
element. If two or more footnotes could fit on the
same line in the footnote area, they should be
placed inline.
Inline = 1
The footnote element is placed in the footnote
area as an inline element.