We can get an all-caps post with the strategic deployment of HTML character-entities (including, but perhaps not limited to,
and ­
).
These techniques do not work for a topic title: upon saving an ALL CAPS TOPIC TITLE the title will be transformed to an initial cap, followed by all lower-caps. Eg: All caps topic title
. This stays true on subsequent edits.
My tests on embedding HTML character-entities in titles seems to indicate that they are rendered as plain-text.
Thus ALL CAP TITLE
will be transformed into ALL CAP   TITLE
NOTE: ­
is a soft-hypen; it will render if the enclosing text can span a line-break.
See Also: Six characters in search of a loophole