See the linked page:
== <center> foo </center> ==
gets parsed to
<h2><span class="mw-headline" id="Foo"></span></h2> <center> <h2>Foo<span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=User:MaxSem/sandbox&action=edit&section=1" title="Edit section: Foo">edit</a><span class="mw-editsection-bracket">]</span></span></h2> </center>
Version: 1.22.0
URL: https://en.wikipedia.org/w/index.php?title=User:MaxSem/sandbox&oldid=574519894