This is a complex test involving the interaction of bidi, white space collapsing, borders, padding, and shrink-wrapping. UAs fail in various ways.
Failure by misplaced border and/or padding: Opera, Konqueror
Failure by failure to process end-of-line white space trimming /after/ bidi reordering: Firefox (failure type A), Opera (failure type A), Konqueror (failure type B)
Failure to shrink-wrap accurately: Firefox
Bidi embedding terminated at <br> as if it was the end of a block: WebKit (https://bugs.webkit.org/show_bug.cgi?id=23124)
[Test result analysis needed for IE]
Make it undefined in CSS2.1 whether white space stripping happens before or after bidi reordering. Leave definition intact for CSS3 Text. Split test.