footnote: add margin-note and backlink support #545
+519
−61
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Based on ideas and discussion in #543.
Support a
#:marginmode fordefine-footnoteas an alternative to putting footnotes in a section created by afootnote-partidentifier that is bound bydefine-footnote. The margin format is defined by default CSS, and different CSS magic could make cause a "margin note" to actually render differently.At the footnote, hyperlink its number back to the reference to the footnote, as as typical for many web sites with footnotes.
For testing, use a strategy that has worked well for Rhombus Scribble (and that probably should be made more reusable).