[letter-spacing] clarification needed

>From css2 <https://www.w3.org/TR/CSS2/text.html#propdef-letter-spacing>

"This property specifies spacing behavior *between* text characters"

Yet css3 Text Module
<https://drafts.csswg.org/css-text-3/#letter-spacing-property> adds even
more:

"Letter-spacing must *not* be applied *at the beginning or at the end of a
line*."

But what if an inline <span> has letter-spacing set and its sibling runs
has no or different letter-spacing?

As far as I understand it should be render this way:



But Chrome (and all other UAs) render it as this:



Do we need to clarify letter-spacing further or that would be too much to
ask?

Test case: http://terrainformatica.com/w3/letter-spacing.htm


-- 
Andrew Fedoniouk.

http://sciter.com