2009-10-26 13:43:17: Description changed to 'quoting David Carlisle:
"In HTML4's SGML parsing, or XML parsing, literal newlines would be normalised to space characters, explicitly... In order to get a newline into the attribute value you need to use a character reference such as
<abbr title="Hypertext Transport Protocol">HTTP</abbr>
It would help future parallel authoring of HTML and X((HT)ML if the attribute
value white space normalisation happened in both serialisations."
Related bug: http://www.w3.org/Bugs/Public/show_bug.cgi?id=8003'