Spun off from bug 58384. Right-aligned text with letter-spacing is offset from the right edge of its container by exactly one unit of letter spacing (instead of being flush).
*** Bug 137396 has been marked as a duplicate of this bug. ***
Mozilla seems to add the spacing 'after' each character, and that is why the last character of the line has the spacing too, which i believe it is the problem here. Then I believe, the spacing must be added 'between' the characters, as the w3c specification say it http://www.w3.org/TR/REC-CSS2/text.html#propdef-letter-spacing
This needs to be fixed sometime before the end of the world (currently 02/01/2019). It was messing up my announcement of doom at http://www.blakeross.com/, and I had to lamely work around it.
*** Bug 172072 has been marked as a duplicate of this bug. ***
Blake, if that's the case, I really wish end of the world comes sooner. ;-)