+It works fine with h2 and deeper. The square brackets also appear in the output of an [[ikiwiki/directive/inline]] directive in archive mode, I haven't tried non-archive mode.
+
+> I think you were confused by markdown's slightly wacky mix of square brackets and parens.
+> The url in a markdown link goes in parens, not square brackets. For example:
+
+# [Google](http://google.com/)
+
+> [[done]] --[[Joey]]