Author: ayg

Description:
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.

Version: 1.14.x
Severity: minor
URL: http://validator.w3.org/check?uri=http%3A%2F%2Fwww.mediawiki.org%2Fwiki%2FUser%3ASimetrical%2FBug_16891