A character attribute strokeBehindFill paints a text stroke under the fill
at double width, so its full weight lies outside the letters and they keep
their shape. Screen and PNG rendering, PDF export (stroke as outlines
first, then the filled text, so the text is not duplicated; clipped to the
outside of the glyphs when there is no fill), Create Outlines (outside-
aligned stroke), the Properties panel and Character Style Options.
IDML StrokeAlignment on CharacterStyleRange, CharacterStyle and
ParagraphStyle imports and exports as the attribute (OutsideAlignment =
on, CenterAlignment = off).
