> While considering how to add a footnotes to TextScript I came across
> this, which could be intended or a bug. If the positioning number pair
> is set to #'(0 . 0) the footnote mark is located in both x and y directions
> on the centre of the TextScript object, but if the values are set to any
> non-zero value the offsets are calculated from the top-right corner of the
> TextScript object. So to position the mark where it would normally be
> after text you have to set the values to any tiny non-zero value.