An automated run of parserTests.php showed the following failures:
Running test Definition list with wikilink containing colon... FAILED!
Running test BUG 361: URL within URL, not bracketed... FAILED!
Running test External links: invalid character... FAILED!
Running test Bug 2702: Mismatched <i> and <a> tags are invalid... FAILED!
Running test A table with no data.... FAILED!
Running test A table with nothing but a caption... FAILED!
Running test Broken link... FAILED!
Running test Link to namespaces... FAILED!
Running test Piped link to namespace... FAILED!
Running test Link containing % (not as a hex sequence)... FAILED!
Running test Link containing % as a single hex sequence interpreted to char... FAILED!
Running test Link containing "#<" and "#>" % as a hex
sequences... FAILED!
Running test Magic links: internal link to RFC (bug 479)... FAILED!
Running test Magic links: PMID incorrectly converts space to underscore... FAILED!
Running test Nonexistant template... FAILED!
Running test Template with thumb image (wiht link in description)... FAILED!
Running test Link to image page... FAILED!
Running test BUG 1887: A ISBN with a thumbnail... FAILED!
Running test BUG 1887: A <math> with a thumbnail... FAILED!
Running test Image caption containing another image... FAILED!
Running test Disabled subpages... FAILED!
Running test BUG 561: {{/Subpage}}... FAILED!
Running test Simple category... FAILED!
Running test Basic section headings... FAILED!
Running test Section headings with TOC... FAILED!
Running test Handling of sections up to level 6 and beyond... FAILED!
Running test Resolving duplicate section names... FAILED!
Running test Template with sections, __NOTOC__... FAILED!
Running test Link inside a section heading... FAILED!
Running test Media link with nasty text... FAILED!
Running test Image link to nonexistent file (bug 1850 - good)... FAILED!
Running test :Image link to nonexistent file (bug 1850 - bad)... FAILED!
Running test Bug 2095: link with pipe and three closing brackets... FAILED!
Running test Sanitizer: Validating the contents of the id attribute (bug 4515)... FAILED!
Passed 247 of 281 tests (87.9%) FAILED!