Forward slashes in weird places

Hi!

Not sure this is the appropriate place to post this, sorry in advance!

I've been finding a surprising number of forward slashes in non-self closing tags like divs and textareas, here's one:

https://trac.elgg.org/elgg/browser/releases/full/elgg1.5/mod/messageboard/views/default/messageboard/group_messageboard.php#L53

 

Any reason why they're there?

Ricardo