Last modified: 2009-05-04 19:13:31 UTC
This input: == a == == a == == a 2 == produces the anchors "a", "a_2", and "a_2" respectively. A page containing these headings would therefore break XHTML validity (see URL). Parser::formatHeadings() should check for this case, if anyone can be bothered.
*** This bug has been marked as a duplicate of bug 10025 ***