No one theme displays all available wiki formatting correctly

[najevi]

The default wiki theme is "light"
Italics, superscript and subscript are not displayed correctly using this
default theme.
Appending "?action=print" to a wiki page url does correctly display some of
this missing formatting but does not display _underline_ format (and
possibly other formatting that I overlooked).
Other available themes are no more complete in their ability to display all
available wiki formatting.

To avoid scope-creep at (https://bugs.launchpad.net/ubuntu-docs/+bug/1057987)
I am mailing this feedback to ubuntu-doc at lists.ubuntu.com which might be a
more appropriate target audience.

Perhaps an administrator of the Ubuntu Community Wiki could review the
Themes made available to a wiki user against the various formatting options
available at the wiki.

Useful test wiki pages are:
https://help.ubuntu.com/community/HelpOnFormatting
and
https://help.ubuntu.com/community/HelpOnMoinWikiSyntax

The user accessible themes selected at
https://help.ubuntu.com/community/HelpOnUserPreferences?action=userprefs&sub=prefs
are:

classic, modern, modernized, modernized_cms, rightsidebar, ubununew, light
(the default) and kubuntunew

*ubuntunew* cannot be applied for some reason

*classic, modern, modernized, modernized_cms, rightsidebar *and *kubuntunew*
display:
italics, super/sub script and most other formats
(but _not_ underline _nor_ strike-through _nor_ colorized code aka Syntax
Highlighting _nor_ smileys)

"*light*" theme
displays underline, strike-through, SyntaxHighlighting, smileys and most
other formats
(but _not_ italics _nor_ super/sub script)

So although "light" looks like the best compromise, I have to believe it is
possible to fix light (the default) so that all available formatting is
correctly displayed.

(I am willing to invest time to figure out this detail.)
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