Removed stipulation that an empty `Bd -offset' will default to 6n. Not

sure where this came about.  Added regression tests to convince myself
that this is so.  Also consolidated COMPATIBILITY notes regarding `Bd'.
Added COMPATIBILITY note to the effect that old groff pukes on `Bd
-compact -ragged' (regression test will fail on old groff).

1 files changed, 9 insertions, 16 deletions

diff --git a/mdoc.7 b/mdoc.7
index f2c03c53..1a25d73f 100644
--- a/mdoc.7
+++ b/mdoc.7
@@ -1094,10 +1094,7 @@ As a scaling unit following the syntax described in
 As the calculated string length of the opaque string.
 .El
 .Pp
-If unset, it will revert to the value of
-.Ar 8n
-as described in
-.Sx Scaling Widths .
+If not provided an argument, it will be ignored.
 .It Fl compact
 Do not assert a vertical space before the block.
 .It Fl file Ar file
@@ -2169,11 +2166,8 @@ Heirloom troff, the other significant troff implementation accepting
 .Pp
 .Bl -dash -compact
 .It
-groff supports a
-.Fl file Ar filename
-argument to
-.Sx \&Bd .
-mandoc does not.
+Old groff fails to assert a newline before
+.Sx \&Bd Fl ragged compact .
 .It
 groff behaves inconsistently when encountering
 .Pf non- Sx \&Fa
@@ -2249,16 +2243,15 @@ In quoted literals, groff allowed pair-wise double-quotes to produce a
 standalone double-quote in formatted output.
 This idiosyncratic behaviour is not applicable in mandoc.
 .It
-Display types
+Display offsets
 .Sx \&Bd
-.Fl center
+.Fl offset Ar center
 and
-.Fl right
-are aliases for
-.Fl left
-in mandoc.  Furthermore, the
+.Fl offset Ar right
+are disregarded in mandoc.
+Furthermore, the
 .Fl file Ar file
-argument is ignored.
+argument is not supported in mandoc.
 Lastly, since text is not right-justified in mandoc (or even groff),
 .Fl ragged
 and