Webkit is just doing physical wrap, as the form definition requests!
LWN's comment text field says:
<textarea wrap="physical" rows="15" name="c_body" cols="75">
I'm not sure why LWN even has that attribute: I'd suggest just removing it. I'm pretty sure the site
code itself already hard wraps any input you send it, so asking the browser to do so too is just
asking for trouble...
(Note that that's not actually part of any HTML spec: it's a netscape extension from way back