[CSS3 Text] shadow stacking levels

Unlike text-decoration, text-shadow according to its current CSS3 Text definition
inherits and is painted by each text run's parent element. With that premise,
given the style rule
   span { text-shadow: ...; }
the HTML snippets
   <span>sometext</span>
and
   <span>some</span><span>text</span>
won't be rendered the same: the shadow of the next element will overlap the
foreground text of the previous. That just looks wrong. Is there some
way to specify text-shadow so that that doesn't happen?

~fantasai