AsciiDoc Bugs and Known Problems
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- Reported line numbers in diagnostic messages are sometimes wrong.
- Block filters only work in a POSIX environment.
- The CSS stylesheets used by `css` and `css-embedded` backends render
  ugly results with some element combinations. Actually they're a mess
  -- I've tweaked them to death rather than taking a deep breath and
  rebuilding them cleanly from scratch. Mea culpa.
- Embedding open brace characters { in argument values can cause
  incorrect argument substitution.
- Section numbering is incorrect when outputting HTML from a
  multi-part book type document. This is not a biggy since multi-part
  books are generally processed to DocBook.
- A row of apostrophes in an inline context throws AsciiDoc into an
  endless loop.
