Last modified: 2011-12-14 17:37:37 UTC
When a page contains an unterminated HTML content, it is usually in error. If the unterminated comment is in the middle of an article, it is easy to notice and understand the reason (if you know what an HTML comment is). If it is in the list of categories or interwiki links, not so much. There should be a warning when a comment is unterminated.
This was suggested by Daniel_WMDE on #wikimedia-tech.