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Re:Please tell us what features you'd like in news.ycombinator by asdfghjkl on Saturday March 21, 2009 @06:04PM (#526677)
Security Issue (Availability)

Disable the use of "pre" tags or enforce maximum line lengths for "pre" sections on comment threads. Long "pre" lines widen the entire page width so you have to keep scrolling right and left to read. In addition to accidental problems, you might also run into problems with trolls.

http://en.wikipedia.org/wiki/Forum_spam#Page_widening

Re:Please tell us what features you'd like in news.ycombinator by asdfghjkl on Thursday March 26, 2009 @06:56PM (#534309)
It looks like this item is a duplicate of a previous one

http://news.ycombinator.com/item?id=280852

The other post gives a nice example of where the problem actually occurs. Note that contrary to what the other item says, the issue isn't actually "code" tags per se, but "pre" tags.