https://bugzilla.wikimedia.org/show_bug.cgi?id=23597

--- Comment #5 from Aryeh Gregor <[email protected]> 2010-05-21 
14:48:02 UTC ---
The general problem is bug 7356.  This is why *all* new id's should be prefixed
with "mw-".  "head" is not a new id, of course, so it didn't follow this
policy.  Prefixing with "mw-" means collision by accident is very unlikely, and
if it does happen, we can force user-added id's to not start with "mw-" by
adding some extra prefix.

There are still lots of other ways to get id conflicts, of course, like

== Title ==
== Title ==
== Title 2 ==

or just <span id="foo"></span><span id="foo"></span>.  There are various bugs
open for this, but in general, avoiding all duplicate id's is impractical.

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