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Ryosuke points out <http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2011-August/032782.html> that CSS2.1 section 16.6.1 has useful info on collapsing whitespace.
http://aryeh.name/gitweb.cgi?p=editing;a=commitdiff;h=617f9cef
This bug is still being referenced from http://aryeh.name/spec/editing/editing.html#invisible
Thanks, fixed: http://aryeh.name/gitweb.cgi?p=editing;a=commitdiff;h=c133aacc