The last example of Example 16 in letter-spacing property says:

Letter spacing is inserted after RTL reordering

But letter-spacing affects line breaking, so we need to compute before line breaking.

Is this saying, compute once for line breaking in logical order, then re-compute after line breaking in visual order? Then the line width will not match and it may result in large-lagged lines, correct?

Test: http://output.jsbin.com/hudaxi