special trick: bind @code{inhibit-read-only} to a non-@code{nil} value
and then remove the property. @xref{Read Only Buffers}.
+@item inhibit-read-only
+@kindex inhibit-read-only @r{(text property)}
+If a character has the property @code{inhibit-read-only}, and the
+buffer is read-only, editing the character in question is allowed.
+
@item invisible
@kindex invisible @r{(text property)}
A non-@code{nil} @code{invisible} property can make a character invisible