Further clarification regarding white-space collapse needed

From: White Lynx <whitelynx@operamail.com> Date: Thu, 20 Sep 2007 18:49:54 +0400 To: www-style@w3.org Message-Id: <20070920144954.D55D7CA0A4@ws5-11.us4.outblaze.com> · This archive was generated by hypermail 2.2.0+W3C-0.50 : Monday, 27 April 2009 13:54:52 GMT

Can anyone clarify whether white space is supposed to collapse through format characters #x202A, #x202B, #x202C, #x202D, #x202E (for normal, nowrap and pre-line values of white-space properties). 

It is not clear for me from current spec and different browsers handle such cases differently, for example
A &#x202E; C B&#x202C;D
in Opera 9.5 and Safari 3 looks like
A B C D
as they don't collapse space through format characters. In Mozilla it looks like:
A B CD

The question is which interpretation is right and whether it can be clarified in spec?

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