Last modified: 2013-05-22 18:23:56 UTC
Placing <noinclude>, <includeonly> or <onlyinclude> tags next to the "==" parts of a header is allowed, and does not affect the layout, but breaks section editing links. <noinclude>== header == text</noinclude> Will display normally, but the section becomes impossible to edit. This appears particularly with <onlyinclude> used for the [[Wikipedia:Featured content]] lists.
See also bug 4899 and dependencies. This looks like yet another consequence of logic duplication between Parser and other stuff. However, I can't reproduce with the provided code (see URL).
Maybe it has to do with the version of MediaWiki Wikipedia uses? And is it possible the section 0 edit link script interferes?
All Wikimedia installations are using the same version of the software. If you think JavaScript may be an issue (unlikely), please turn off JavaScript to test and then report back. Try to make a page wherever you like exhibiting the problem and link to it from here. We can't do very much if we can't see the bug occurring.
Here is an example revid of this bug from Wikipedia: http://en.wikipedia.org/w/index.php?title=Wikipedia:Sandbox&oldid=417997227 Present in 1.16.2 release as well: Installed software Product Version MediaWiki 1.16.2 PHP 5.2.0-8+etch16 (cgi-fcgi) MySQL 5.0.51a-24+lenny2+spu1 Installed extensions Extension functions wfwebsiteFrame Parser extension tags <gallery>, <nowiki>, <pre> and <websiteframe> Parser function hooks anchorencode, basepagename, basepagenamee, defaultsort, displaytitle, filepath, formatdate, formatnum, fullpagename, fullpagenamee, fullurl, fullurle, gender, grammar, int, language, lc, lcfirst, localurl, localurle, namespace, namespacee, ns, nse, numberingroup, numberofactiveusers, numberofadmins, numberofarticles, numberofedits, numberoffiles, numberofpages, numberofusers, numberofviews, padleft, padright, pagename, pagenamee, pagesincategory, pagesize, plural, protectionlevel, special, subjectpagename, subjectpagenamee, subjectspace, subjectspacee, subpagename, subpagenamee, tag, talkpagename, talkpagenamee, talkspace, talkspacee, uc, ucfirst and urlencode
