Wikipedia supports HTML comments. You can enclose text in
<!-- and -->. This means that while the text will still be visible in
wikisource, it will not be visible on the displayed page.
I see in many articles that people add comments like: "To do: .." or
"needs to be expanded" or "who was this?". Some pages also have
"Notes to
Wikipedia editors" and the like.
In case of detailed discussions, this should of course be moved to the
Talk page. But if it is useful to have directly in the text but only
useful for editors, we should use HTML comments for these kind of meta-
remarks. A non Wikipedia editor should not be exposed to meta-content like
this.
So when you see such a remark and don't want to delete it, please enclose
it in <!-- and --> to hide it from the rendered page, but not from those
who edit it. You *must* use this exact character sequence, the shorter
<!- foo -> or other variants like <- foo -> will *not* work.
Thanks!
Erik