An automated run of parserTests.php showed the following failures:
This is MediaWiki version 1.12alpha (r26265).
Reading tests from "maintenance/parserTests.txt"...
Reading tests from "extensions/Cite/citeParserTests.txt"...
Reading tests from "extensions/Poem/poemParserTests.txt"...
Reading tests from "extensions/LabeledSectionTransclusion/lstParserTests.txt"...
17 still FAILING test(s) :(
* URL-encoding in URL functions (single parameter) [Has never passed]
* URL-encoding in URL functions (multiple parameters) [Has never passed]
* Table security: embedded pipes (http://lists.wikimedia.org/mailman/htdig/wikitech-l/2006-April/022293.html) [Has never passed]
* Link containing double-single-quotes '' (bug 4598) [Has never passed]
* message transform: <noinclude> in transcluded template (bug 4926) [Has never passed]
* message transform: <onlyinclude> in transcluded template (bug 4926) [Has never passed]
* BUG 1887, part 2: A <math> with a thumbnail- math enabled [Has never passed]
* HTML bullet list, unclosed tags (bug 5497) [Has never passed]
* HTML ordered list, unclosed tags (bug 5497) [Has never passed]
* HTML nested bullet list, open tags (bug 5497) [Has never passed]
* HTML nested ordered list, open tags (bug 5497) [Has never passed]
* Inline HTML vs wiki block nesting [Has never passed]
* Mixing markup for italics and bold [Has never passed]
* dt/dd/dl test [Has never passed]
* Images with the "|" character in the comment [Has never passed]
* Parents of subpages, two levels up, without trailing slash or name. [Has never passed]
* Parents of subpages, two levels up, with lots of extra trailing slashes. [Has never passed]
Passed 527 of 544 tests (96.88%)... 17 tests failed!